diff --git a/typescript/faucet-mcp/README.md b/typescript/faucet-mcp/README.md
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+# TBNB Faucet MCP Server (Node.js)
+
+A Node.js implementation of a Model Context Protocol (MCP) server that provides a faucet service for distributing testnet BNB tokens on the Binance Smart Chain testnet.
+
+## About
+
+This MCP server enables AI agents and other MCP clients to request and receive testnet BNB tokens by interacting with the BSC testnet blockchain. It follows the Anthropic MCP specification and can be integrated with any MCP-compatible client.
+
+## Prerequisites
+
+- Node.js 18.0 or higher
+- npm or yarn package manager
+- A BSC testnet wallet with TBNB for the faucet
+- Access to BSC testnet RPC endpoint
+
+## Installation
+
+1. Navigate to the project directory:
+```bash
+cd faucet-mcp
+```
+
+2. Install dependencies:
+```bash
+npm install
+```
+
+## Configuration
+
+Set the following environment variables before running:
+
+- `FAUCET_PRIVATE_KEY`: The private key of your faucet wallet (required)
+- `BSC_TESTNET_RPC`: BSC testnet RPC endpoint URL (optional, has default)
+
+Example:
+
+```bash
+export FAUCET_PRIVATE_KEY="0x..."
+export BSC_TESTNET_RPC="https://data-seed-prebsc-1-s1.binance.org:8545/"
+```
+
+Or create a `.env` file (not included in repo for security):
+
+```
+FAUCET_PRIVATE_KEY=0x...
+BSC_TESTNET_RPC=https://data-seed-prebsc-1-s1.binance.org:8545/
+```
+
+## Usage
+
+Run the server:
+
+```bash
+node index.js
+```
+
+Or using npm:
+
+```bash
+npm start
+```
+
+The server communicates via stdio, which is the standard transport for MCP servers.
+
+## Available Tools
+
+### send_tbnb
+
+Sends testnet BNB tokens to a recipient address.
+
+**Parameters:**
+- `recipient` (string, required): BSC testnet address to receive tokens
+- `amount` (number, optional): Amount of TBNB to send (default: 0.1, max: 1.0)
+
+**Returns:**
+- Transaction hash
+- Recipient address
+- Amount sent
+- Block number
+- Transaction status
+
+### get_faucet_info
+
+Retrieves information about the faucet wallet.
+
+**Parameters:** None
+
+**Returns:**
+- Faucet wallet address
+- Current balance (Wei and TBNB)
+- Network information
+- RPC endpoint
+
+### get_balance
+
+Queries the TBNB balance of any BSC testnet address.
+
+**Parameters:**
+- `address` (string, required): BSC testnet address to check
+
+**Returns:**
+- Address (checksummed)
+- Balance in Wei and TBNB
+- Network name
+
+## MCP Client Integration
+
+To integrate this server with an MCP client, add it to your client configuration:
+
+```json
+{
+  "mcpServers": {
+    "tbnb-faucet": {
+      "command": "node",
+      "args": ["/absolute/path/to/index.js"],
+      "env": {
+        "FAUCET_PRIVATE_KEY": "0x...",
+        "BSC_TESTNET_RPC": "https://data-seed-prebsc-1-s1.binance.org:8545/"
+      }
+    }
+  }
+}
+```
+
+## Network Configuration
+
+- **Network**: Binance Smart Chain Testnet
+- **Chain ID**: 97
+- **Default RPC**: https://data-seed-prebsc-1-s1.binance.org:8545/
+- **Block Explorer**: https://testnet.bscscan.com
+
+## Error Handling
+
+The server includes comprehensive error handling:
+
+- Address validation (checksum and format)
+- Amount validation (0 to 1.0 TBNB)
+- Self-transfer prevention
+- Network connectivity checks
+- Transaction error reporting
+
+All errors are returned as structured JSON responses.
+
+## Security
+
+🔒 **Security Best Practices:**
+
+- Never commit your private key to version control
+- Use environment variables or secure secret management systems
+- This server is intended for testnet use only
+- Consider implementing rate limiting for production deployments
+- Monitor faucet balance and set up alerts
+
+## Troubleshooting
+
+### Common Issues
+
+**"Faucet wallet not configured"**
+- Ensure `FAUCET_PRIVATE_KEY` environment variable is set
+- Verify the private key is valid and starts with `0x`
+
+**Connection errors**
+- Check your internet connection
+- Verify the RPC endpoint is accessible
+- Try an alternative BSC testnet RPC endpoint
+
+**Transaction failures**
+- Ensure the faucet wallet has sufficient TBNB balance
+- Verify the recipient address is valid
+- Check network conditions (gas prices, congestion)
+
+**Module not found errors**
+- Run `npm install` to install dependencies
+- Ensure you're using Node.js 18.0 or higher
+
+## Development
+
+The server uses:
+- `@modelcontextprotocol/sdk` for MCP protocol implementation
+- `ethers.js` v6 for blockchain interactions
+
+## License
+
+MIT License
+
+## Testing
+
+Run unit tests:
+
+```bash
+npm install
+npm test
+```
+
+Run tests with coverage:
+
+```bash
+npm run test:coverage
+```
+
+Run tests in watch mode:
+
+```bash
+npm run test:watch
+```
+
+## Resources
+
+- [Model Context Protocol Documentation](https://modelcontextprotocol.io)
+- [BNB Chain Documentation](https://docs.bnbchain.org)
+- [Ethers.js Documentation](https://docs.ethers.org)
diff --git a/typescript/faucet-mcp/index.js b/typescript/faucet-mcp/index.js
new file mode 100644
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--- /dev/null
+++ b/typescript/faucet-mcp/index.js
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+#!/usr/bin/env node
+
+/**
+ * TBNB Faucet MCP Server
+ * Model Context Protocol server for distributing testnet BNB tokens
+ */
+
+import { Server } from "@modelcontextprotocol/sdk/server/index.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import {
+  CallToolRequestSchema,
+  ListToolsRequestSchema,
+} from "@modelcontextprotocol/sdk/types.js";
+import { ethers } from "ethers";
+
+// Configuration
+const BSC_TESTNET_RPC = process.env.BSC_TESTNET_RPC || "https://data-seed-prebsc-1-s1.binance.org:8545/";
+const FAUCET_PRIVATE_KEY = process.env.FAUCET_PRIVATE_KEY || "";
+
+if (!FAUCET_PRIVATE_KEY) {
+  console.error("WARNING: FAUCET_PRIVATE_KEY environment variable is not set");
+}
+
+// Initialize provider and wallet
+const provider = new ethers.JsonRpcProvider(BSC_TESTNET_RPC);
+let wallet = null;
+let walletAddress = null;
+
+if (FAUCET_PRIVATE_KEY) {
+  wallet = new ethers.Wallet(FAUCET_PRIVATE_KEY, provider);
+  walletAddress = wallet.address;
+}
+
+// MCP Server
+const server = new Server(
+  {
+    name: "tbnb-faucet",
+    version: "1.0.0",
+  },
+  {
+    capabilities: {
+      tools: {},
+    },
+  }
+);
+
+// List available tools
+server.setRequestHandler(ListToolsRequestSchema, async () => {
+  return {
+    tools: [
+      {
+        name: "send_tbnb",
+        description: "Send testnet BNB tokens to a specified address on BSC testnet",
+        inputSchema: {
+          type: "object",
+          properties: {
+            recipient: {
+              type: "string",
+              description: "The BSC testnet address that will receive the TBNB tokens",
+            },
+            amount: {
+              type: "number",
+              description: "Amount of TBNB to send (default: 0.1, maximum: 1.0)",
+              default: 0.1,
+            },
+          },
+          required: ["recipient"],
+        },
+      },
+      {
+        name: "get_faucet_info",
+        description: "Get information about the faucet including current balance",
+        inputSchema: {
+          type: "object",
+          properties: {},
+        },
+      },
+      {
+        name: "get_balance",
+        description: "Get the TBNB balance of a BSC testnet address",
+        inputSchema: {
+          type: "object",
+          properties: {
+            address: {
+              type: "string",
+              description: "The BSC testnet address to check",
+            },
+          },
+          required: ["address"],
+        },
+      },
+    ],
+  };
+});
+
+// Handle tool calls
+server.setRequestHandler(CallToolRequestSchema, async (request) => {
+  const { name, arguments: args } = request.params;
+
+  try {
+    switch (name) {
+      case "send_tbnb":
+        return await handleSendTbnb(args);
+      case "get_faucet_info":
+        return await handleGetFaucetInfo();
+      case "get_balance":
+        return await handleGetBalance(args);
+      default:
+        throw new Error(`Unknown tool: ${name}`);
+    }
+  } catch (error) {
+    return {
+      content: [
+        {
+          type: "text",
+          text: JSON.stringify(
+            {
+              error: error.message,
+            },
+            null,
+            2
+          ),
+        },
+      ],
+      isError: true,
+    };
+  }
+});
+
+/**
+ * Send TBNB to a recipient address
+ */
+async function handleSendTbnb(args) {
+  if (!wallet) {
+    throw new Error("Faucet wallet not configured. Please set FAUCET_PRIVATE_KEY.");
+  }
+
+  const recipient = args?.recipient;
+  const amount = args?.amount || 0.1;
+
+  if (!recipient) {
+    throw new Error("Recipient address is required");
+  }
+
+  // Validate address
+  if (!ethers.isAddress(recipient)) {
+    throw new Error(`Invalid address: ${recipient}`);
+  }
+
+  const recipientAddress = ethers.getAddress(recipient);
+
+  // Prevent self-transfer
+  if (recipientAddress.toLowerCase() === walletAddress.toLowerCase()) {
+    throw new Error("Cannot send tokens to the faucet address itself");
+  }
+
+  // Validate amount
+  if (amount <= 0 || amount > 1.0) {
+    throw new Error("Amount must be between 0 and 1.0 TBNB");
+  }
+
+  try {
+    // Convert amount to Wei
+    const amountWei = ethers.parseEther(amount.toString());
+
+    // Get current gas price
+    const feeData = await provider.getFeeData();
+
+    // Send transaction
+    const tx = await wallet.sendTransaction({
+      to: recipientAddress,
+      value: amountWei,
+      gasLimit: 21000,
+      gasPrice: feeData.gasPrice,
+    });
+
+    // Wait for transaction to be mined
+    const receipt = await tx.wait();
+
+    return {
+      content: [
+        {
+          type: "text",
+          text: JSON.stringify(
+            {
+              success: true,
+              transactionHash: tx.hash,
+              recipient: recipientAddress,
+              amount: amount,
+              amountWei: amountWei.toString(),
+              blockNumber: receipt.blockNumber,
+              status: receipt.status === 1 ? "confirmed" : "failed",
+            },
+            null,
+            2
+          ),
+        },
+      ],
+    };
+  } catch (error) {
+    throw new Error(`Transaction failed: ${error.message}`);
+  }
+}
+
+/**
+ * Get faucet information and balance
+ */
+async function handleGetFaucetInfo() {
+  if (!walletAddress) {
+    throw new Error("Faucet wallet not configured");
+  }
+
+  try {
+    const balance = await provider.getBalance(walletAddress);
+    const balanceTbnb = ethers.formatEther(balance);
+
+    // Get network info
+    const network = await provider.getNetwork();
+
+    return {
+      content: [
+        {
+          type: "text",
+          text: JSON.stringify(
+            {
+              faucetAddress: walletAddress,
+              balanceWei: balance.toString(),
+              balanceTbnb: parseFloat(balanceTbnb),
+              network: {
+                name: "BSC Testnet",
+                chainId: network.chainId.toString(),
+              },
+              rpcEndpoint: BSC_TESTNET_RPC,
+            },
+            null,
+            2
+          ),
+        },
+      ],
+    };
+  } catch (error) {
+    throw new Error(`Failed to get faucet info: ${error.message}`);
+  }
+}
+
+/**
+ * Get balance of an address
+ */
+async function handleGetBalance(args) {
+  const address = args?.address;
+
+  if (!address) {
+    throw new Error("Address is required");
+  }
+
+  // Validate address
+  if (!ethers.isAddress(address)) {
+    throw new Error(`Invalid address: ${address}`);
+  }
+
+  try {
+    const addressChecksum = ethers.getAddress(address);
+    const balance = await provider.getBalance(addressChecksum);
+    const balanceTbnb = ethers.formatEther(balance);
+
+    return {
+      content: [
+        {
+          type: "text",
+          text: JSON.stringify(
+            {
+              address: addressChecksum,
+              balanceWei: balance.toString(),
+              balanceTbnb: parseFloat(balanceTbnb),
+              network: "BSC Testnet",
+            },
+            null,
+            2
+          ),
+        },
+      ],
+    };
+  } catch (error) {
+    throw new Error(`Failed to get balance: ${error.message}`);
+  }
+}
+
+// Start server
+async function main() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+
+  console.error("TBNB Faucet MCP Server running on stdio");
+}
+
+main().catch((error) => {
+  console.error("Fatal error:", error);
+  process.exit(1);
+});
diff --git a/typescript/faucet-mcp/index.test.js b/typescript/faucet-mcp/index.test.js
new file mode 100644
index 0000000..9f47c94
--- /dev/null
+++ b/typescript/faucet-mcp/index.test.js
@@ -0,0 +1,277 @@
+/**
+ * Unit tests for TBNB Faucet MCP Server (Example 3 - Node.js)
+ * 
+ * Note: These tests focus on the business logic and validation
+ * rather than full integration with the MCP server, since the server
+ * initializes on import and uses stdio transport.
+ */
+
+import { describe, test, expect, beforeEach, jest } from '@jest/globals';
+
+describe('Address Validation Logic', () => {
+  test('should validate correct Ethereum address format', () => {
+    const validAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb0';
+    // Ethereum addresses are 42 characters (0x + 40 hex chars)
+    expect(validAddress.length).toBe(42);
+    expect(validAddress.startsWith('0x')).toBe(true);
+    expect(/^0x[a-fA-F0-9]{40}$/.test(validAddress)).toBe(true);
+  });
+
+  test('should reject invalid address formats', () => {
+    const invalidAddresses = [
+      'invalid',
+      '0x123',
+      '742d35Cc6634C0532925a3b844Bc9e7595f0bEb', // Missing 0x
+      '0xGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG', // Invalid hex
+      '',
+    ];
+
+    invalidAddresses.forEach((addr) => {
+      const isValid = addr.length === 42 && addr.startsWith('0x') && /^0x[a-fA-F0-9]{40}$/.test(addr);
+      expect(isValid).toBe(false);
+    });
+  });
+});
+
+describe('Amount Validation Logic', () => {
+  test('should accept valid amounts between 0 and 1.0', () => {
+    const validAmounts = [0.01, 0.1, 0.5, 1.0];
+    
+    validAmounts.forEach((amount) => {
+      const isValid = amount > 0 && amount <= 1.0;
+      expect(isValid).toBe(true);
+    });
+  });
+
+  test('should reject zero or negative amounts', () => {
+    const invalidAmounts = [0, -0.1, -1.0];
+    
+    invalidAmounts.forEach((amount) => {
+      const isValid = amount > 0 && amount <= 1.0;
+      expect(isValid).toBe(false);
+    });
+  });
+
+  test('should reject amounts greater than 1.0', () => {
+    const invalidAmounts = [1.1, 2.0, 10.0];
+    
+    invalidAmounts.forEach((amount) => {
+      const isValid = amount > 0 && amount <= 1.0;
+      expect(isValid).toBe(false);
+    });
+  });
+});
+
+describe('Self-Transfer Prevention Logic', () => {
+  test('should detect self-transfer attempts', () => {
+    const faucetAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb';
+    const recipient = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb';
+    
+    const isSelfTransfer = recipient.toLowerCase() === faucetAddress.toLowerCase();
+    expect(isSelfTransfer).toBe(true);
+  });
+
+  test('should allow transfers to different addresses', () => {
+    const faucetAddress = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb';
+    const recipient = '0x1234567890123456789012345678901234567890';
+    
+    const isSelfTransfer = recipient.toLowerCase() === faucetAddress.toLowerCase();
+    expect(isSelfTransfer).toBe(false);
+  });
+});
+
+describe('Wei Conversion Logic', () => {
+  test('should convert TBNB to Wei correctly', () => {
+    // 1 TBNB = 10^18 Wei
+    const tbnbAmounts = [
+      { tbnb: 0.1, wei: '100000000000000000' },
+      { tbnb: 1.0, wei: '1000000000000000000' },
+      { tbnb: 0.01, wei: '10000000000000000' },
+    ];
+
+    tbnbAmounts.forEach(({ tbnb, wei }) => {
+      // Manual conversion for testing
+      const calculatedWei = (tbnb * Math.pow(10, 18)).toString();
+      expect(calculatedWei).toBe(wei);
+    });
+  });
+
+  test('should handle Wei to TBNB conversion', () => {
+    const weiAmounts = [
+      { wei: '100000000000000000', tbnb: 0.1 },
+      { wei: '1000000000000000000', tbnb: 1.0 },
+      { wei: '500000000000000000', tbnb: 0.5 },
+    ];
+
+    weiAmounts.forEach(({ wei, tbnb }) => {
+      // Manual conversion for testing
+      const calculatedTbnb = parseFloat(wei) / Math.pow(10, 18);
+      expect(calculatedTbnb).toBeCloseTo(tbnb, 10);
+    });
+  });
+});
+
+describe('Transaction Response Format', () => {
+  test('should format successful transaction response correctly', () => {
+    const mockResponse = {
+      success: true,
+      transactionHash: '0xabcdef1234567890',
+      recipient: '0x1234567890123456789012345678901234567890',
+      amount: 0.1,
+      amountWei: '100000000000000000',
+      blockNumber: 12345,
+      status: 'confirmed',
+    };
+
+    expect(mockResponse).toHaveProperty('success');
+    expect(mockResponse).toHaveProperty('transactionHash');
+    expect(mockResponse).toHaveProperty('recipient');
+    expect(mockResponse).toHaveProperty('amount');
+    expect(mockResponse).toHaveProperty('blockNumber');
+    expect(mockResponse).toHaveProperty('status');
+    expect(mockResponse.success).toBe(true);
+    expect(mockResponse.status).toBe('confirmed');
+  });
+
+  test('should format error response correctly', () => {
+    const mockErrorResponse = {
+      error: 'Invalid address: invalid_address',
+    };
+
+    expect(mockErrorResponse).toHaveProperty('error');
+    expect(typeof mockErrorResponse.error).toBe('string');
+  });
+});
+
+describe('Faucet Info Response Format', () => {
+  test('should format faucet info response correctly', () => {
+    const mockFaucetInfo = {
+      faucetAddress: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb',
+      balanceWei: '1000000000000000000',
+      balanceTbnb: 1.0,
+      network: {
+        name: 'BSC Testnet',
+        chainId: '97',
+      },
+      rpcEndpoint: 'https://data-seed-prebsc-1-s1.binance.org:8545/',
+    };
+
+    expect(mockFaucetInfo).toHaveProperty('faucetAddress');
+    expect(mockFaucetInfo).toHaveProperty('balanceWei');
+    expect(mockFaucetInfo).toHaveProperty('balanceTbnb');
+    expect(mockFaucetInfo).toHaveProperty('network');
+    expect(mockFaucetInfo).toHaveProperty('rpcEndpoint');
+    expect(mockFaucetInfo.network.chainId).toBe('97');
+  });
+});
+
+describe('Balance Query Response Format', () => {
+  test('should format balance query response correctly', () => {
+    const mockBalanceResponse = {
+      address: '0x1234567890123456789012345678901234567890',
+      balanceWei: '500000000000000000',
+      balanceTbnb: 0.5,
+      network: 'BSC Testnet',
+    };
+
+    expect(mockBalanceResponse).toHaveProperty('address');
+    expect(mockBalanceResponse).toHaveProperty('balanceWei');
+    expect(mockBalanceResponse).toHaveProperty('balanceTbnb');
+    expect(mockBalanceResponse).toHaveProperty('network');
+    expect(mockBalanceResponse.balanceTbnb).toBe(0.5);
+  });
+});
+
+describe('Error Handling', () => {
+  test('should handle missing recipient address', () => {
+    const recipient = '';
+    if (!recipient) {
+      expect(() => {
+        throw new Error('Recipient address is required');
+      }).toThrow('Recipient address is required');
+    }
+  });
+
+  test('should handle missing wallet configuration', () => {
+    const wallet = null;
+    if (!wallet) {
+      expect(() => {
+        throw new Error('Faucet wallet not configured. Please set FAUCET_PRIVATE_KEY.');
+      }).toThrow('Faucet wallet not configured');
+    }
+  });
+
+  test('should handle network errors gracefully', () => {
+    const networkError = new Error('Network error');
+    expect(networkError.message).toBe('Network error');
+    expect(networkError).toBeInstanceOf(Error);
+  });
+});
+
+describe('MCP Tool Schema Validation', () => {
+  test('send_tbnb tool should have correct schema structure', () => {
+    const toolSchema = {
+      name: 'send_tbnb',
+      description: 'Send testnet BNB tokens to a specified address on BSC testnet',
+      inputSchema: {
+        type: 'object',
+        properties: {
+          recipient: {
+            type: 'string',
+            description: 'The BSC testnet address that will receive the TBNB tokens',
+          },
+          amount: {
+            type: 'number',
+            description: 'Amount of TBNB to send (default: 0.1, maximum: 1.0)',
+            default: 0.1,
+          },
+        },
+        required: ['recipient'],
+      },
+    };
+
+    expect(toolSchema).toHaveProperty('name');
+    expect(toolSchema).toHaveProperty('description');
+    expect(toolSchema).toHaveProperty('inputSchema');
+    expect(toolSchema.inputSchema.type).toBe('object');
+    expect(toolSchema.inputSchema.required).toContain('recipient');
+  });
+
+  test('get_faucet_info tool should have correct schema structure', () => {
+    const toolSchema = {
+      name: 'get_faucet_info',
+      description: 'Get information about the faucet including current balance',
+      inputSchema: {
+        type: 'object',
+        properties: {},
+      },
+    };
+
+    expect(toolSchema).toHaveProperty('name');
+    expect(toolSchema).toHaveProperty('description');
+    expect(toolSchema).toHaveProperty('inputSchema');
+    expect(toolSchema.inputSchema.type).toBe('object');
+  });
+
+  test('get_balance tool should have correct schema structure', () => {
+    const toolSchema = {
+      name: 'get_balance',
+      description: 'Get the TBNB balance of a BSC testnet address',
+      inputSchema: {
+        type: 'object',
+        properties: {
+          address: {
+            type: 'string',
+            description: 'The BSC testnet address to check',
+          },
+        },
+        required: ['address'],
+      },
+    };
+
+    expect(toolSchema).toHaveProperty('name');
+    expect(toolSchema).toHaveProperty('description');
+    expect(toolSchema).toHaveProperty('inputSchema');
+    expect(toolSchema.inputSchema.required).toContain('address');
+  });
+});
diff --git a/typescript/faucet-mcp/package.json b/typescript/faucet-mcp/package.json
new file mode 100644
index 0000000..8e7ca75
--- /dev/null
+++ b/typescript/faucet-mcp/package.json
@@ -0,0 +1,41 @@
+{
+  "name": "tbnb-faucet-mcp",
+  "version": "1.0.0",
+  "description": "MCP server for distributing testnet BNB tokens on BSC testnet",
+  "type": "module",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js",
+    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
+    "test:watch": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch",
+    "test:coverage": "node --experimental-vm-modules node_modules/jest/bin/jest.js --coverage"
+  },
+  "keywords": [
+    "mcp",
+    "model-context-protocol",
+    "bnb",
+    "testnet",
+    "faucet",
+    "blockchain"
+  ],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^0.5.0",
+    "ethers": "^6.9.0"
+  },
+  "devDependencies": {
+    "@jest/globals": "^29.7.0",
+    "jest": "^29.7.0"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "jest": {
+    "testEnvironment": "node",
+    "transform": {},
+    "moduleNameMapper": {
+      "^(\\.{1,2}/.*)\\.js$": "$1"
+    }
+  }
+}
diff --git a/typescript/rpc-health-failover-system/README.md b/typescript/rpc-health-failover-system/README.md
new file mode 100644
index 0000000..b4bfb8d
--- /dev/null
+++ b/typescript/rpc-health-failover-system/README.md
@@ -0,0 +1,155 @@
+# RPC Health Failover System
+
+A small BNB Smart Chain (BSC) demo that monitors multiple RPC endpoints, checks their health in real-time, and automatically fails over to the best available endpoint when one becomes slow or unavailable.
+
+![Screenshot](./rpc-health-failover-system.png)
+
+---
+
+## What it does
+
+- **Monitors** multiple BSC RPC endpoints simultaneously
+- **Health checks** — Periodically tests each endpoint by fetching the latest block number
+- **Status tracking** — Monitors latency, errors, and consecutive failures for each endpoint
+- **Automatic failover** — Switches to the best available endpoint when the current one fails or degrades
+- **Manual override** — Allows you to manually select any endpoint if needed
+- **Real-time UI** — Dark-mode dashboard showing status of all endpoints
+
+The system categorizes endpoints into three status levels:
+- **Healthy** — Latency < 1000ms, responding correctly
+- **Degraded** — Latency 1000–3000ms, still functional but slow
+- **Unhealthy** — Latency > 3000ms or errors, not recommended
+
+---
+
+## Tech stack
+
+- **TypeScript** — App and tests
+- **Express** — HTTP server and API endpoints
+- **Plain HTML/CSS/JS** — Frontend (dark theme, info + interaction panes)
+- **JSON-RPC** — Standard Ethereum/BSC RPC protocol
+
+---
+
+## Quick start
+
+### Option 1: Clone and run script (recommended)
+
+```bash
+git clone <this-repo>
+cd rpc-health-failover-system
+chmod +x clone-and-run.sh
+./clone-and-run.sh
+```
+
+The script creates a `.env` with working RPC URLs, installs deps, runs tests, and starts the server. Open http://localhost:3000.
+
+### Option 2: Manual
+
+```bash
+cd rpc-health-failover-system
+cp .env.example .env   # or create .env with BSC_RPC_URLS and optionally PORT
+npm install
+npm run build
+npm test
+npm start
+```
+
+Then open http://localhost:3000.
+
+---
+
+## Env vars
+
+| Variable                    | Default                                                                 | Description                                    |
+|-----------------------------|-------------------------------------------------------------------------|------------------------------------------------|
+| `BSC_RPC_URLS`              | `https://bsc-dataseed.bnbchain.org,https://bsc-dataseed1.defibit.io,https://bsc-dataseed1.ninicoin.io` | Comma-separated list of BSC RPC endpoints     |
+| `HEALTH_CHECK_INTERVAL_MS`  | `5000`                                                                  | How often to check endpoint health (ms)        |
+| `RPC_TIMEOUT_MS`            | `3000`                                                                  | Timeout for individual RPC calls (ms)          |
+| `PORT`                      | `3000`                                                                  | HTTP server port                               |
+
+---
+
+## Scripts
+
+- `npm run build` — Compile TypeScript to `dist/`
+- `npm start` — Run `node dist/app.js`
+- `npm test` — Run unit tests (Vitest)
+
+---
+
+## Project layout
+
+```
+rpc-health-failover-system/
+├── app.ts              # Express server, RPC health monitoring, failover logic
+├── frontend.html       # Dark-mode UI (left: info, right: status dashboard)
+├── app.test.ts        # Unit tests for health checks and failover logic
+├── clone-and-run.sh   # One-command setup and run
+├── README.md          # This file
+├── package.json       # Dependencies and scripts
+├── tsconfig.json      # TypeScript configuration
+└── vitest.config.ts   # Test configuration
+```
+
+---
+
+## API
+
+- `GET /` — Serves the UI.
+
+- `GET /api/health` — Returns health status of all endpoints. Returns JSON:
+
+  ```json
+  {
+    "endpoints": [
+      {
+        "url": "https://bsc-dataseed.bnbchain.org",
+        "status": "healthy",
+        "latencyMs": 245,
+        "lastCheck": 1706123456789,
+        "lastError": null,
+        "consecutiveFailures": 0,
+        "lastBlockNumber": 34567890
+      }
+    ],
+    "activeEndpoint": "https://bsc-dataseed.bnbchain.org",
+    "totalEndpoints": 3,
+    "healthyCount": 2,
+    "degradedCount": 1,
+    "unhealthyCount": 0
+  }
+  ```
+
+- `POST /api/set-active` — Manually set the active endpoint. Body:
+
+  ```json
+  { "url": "https://bsc-dataseed.bnbchain.org" }
+  ```
+
+- `GET /api/test-call` — Make a test RPC call using the active endpoint. Returns:
+
+  ```json
+  {
+    "success": true,
+    "activeEndpoint": "https://bsc-dataseed.bnbchain.org",
+    "blockNumber": 34567890,
+    "blockNumberHex": "0x20f5f2a"
+  }
+  ```
+
+---
+
+## How failover works
+
+1. **Health checks** run every 5 seconds (configurable via `HEALTH_CHECK_INTERVAL_MS`)
+2. Each endpoint is tested by calling `eth_blockNumber`
+3. Endpoints are ranked by status (healthy > degraded > unhealthy) and then by latency
+4. The best endpoint is automatically selected as active
+5. If the active endpoint fails during an RPC call, the system immediately fails over to the next best endpoint
+
+---
+
+## License
+
+MIT.
diff --git a/typescript/rpc-health-failover-system/app.test.ts b/typescript/rpc-health-failover-system/app.test.ts
new file mode 100644
index 0000000..4ef8143
--- /dev/null
+++ b/typescript/rpc-health-failover-system/app.test.ts
@@ -0,0 +1,320 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import {
+  checkEndpointHealth,
+  RpcFailoverManager,
+  RpcStatus,
+} from "./app.js";
+
+describe("checkEndpointHealth", () => {
+  beforeEach(() => {
+    vi.stubGlobal("fetch", vi.fn());
+  });
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("returns healthy status for fast response (< 1000ms)", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({
+        jsonrpc: "2.0",
+        id: 1,
+        result: "0x123456",
+      }),
+    });
+
+    const result = await checkEndpointHealth("https://test-rpc.com");
+    expect(result.status).toBe("healthy");
+    expect(result.latencyMs).toBeLessThan(1000);
+    expect(result.error).toBeNull();
+    expect(result.blockNumber).toBe(0x123456);
+  });
+
+  it("returns degraded status for slow response (1000-3000ms)", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockImplementationOnce(
+      async () => {
+        await new Promise((resolve) => setTimeout(resolve, 1500));
+        return {
+          ok: true,
+          json: async () => ({
+            jsonrpc: "2.0",
+            id: 1,
+            result: "0x123456",
+          }),
+        };
+      }
+    );
+
+    const result = await checkEndpointHealth("https://test-rpc.com");
+    expect(result.status).toBe("degraded");
+    expect(result.latencyMs).toBeGreaterThanOrEqual(1000);
+    expect(result.latencyMs).toBeLessThan(3000);
+    expect(result.error).toBeNull();
+  });
+
+  it("returns unhealthy status for very slow response (> 3000ms)", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockImplementationOnce(
+      async () => {
+        await new Promise((resolve) => setTimeout(resolve, 3500));
+        return {
+          ok: true,
+          json: async () => ({
+            jsonrpc: "2.0",
+            id: 1,
+            result: "0x123456",
+          }),
+        };
+      }
+    );
+
+    const result = await checkEndpointHealth("https://test-rpc.com");
+    expect(result.status).toBe("unhealthy");
+    expect(result.latencyMs).toBeGreaterThanOrEqual(3000);
+  });
+
+  it("returns unhealthy status for HTTP error", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
+      ok: false,
+      status: 500,
+    });
+
+    const result = await checkEndpointHealth("https://test-rpc.com");
+    expect(result.status).toBe("unhealthy");
+    expect(result.error).toContain("HTTP");
+    expect(result.blockNumber).toBeNull();
+  });
+
+  it("returns unhealthy status for RPC error", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({
+        jsonrpc: "2.0",
+        id: 1,
+        error: { code: -32000, message: "RPC error" },
+      }),
+    });
+
+    const result = await checkEndpointHealth("https://test-rpc.com");
+    expect(result.status).toBe("unhealthy");
+    expect(result.error).toContain("RPC error");
+    expect(result.blockNumber).toBeNull();
+  });
+
+  it("returns unhealthy status for network error", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockRejectedValueOnce(
+      new Error("Network error")
+    );
+
+    const result = await checkEndpointHealth("https://test-rpc.com");
+    expect(result.status).toBe("unhealthy");
+    expect(result.error).toContain("Network error");
+    expect(result.blockNumber).toBeNull();
+  });
+});
+
+describe("RpcFailoverManager", () => {
+  let manager: RpcFailoverManager;
+
+  beforeEach(() => {
+    vi.stubGlobal("fetch", vi.fn());
+    manager = new RpcFailoverManager([
+      "https://rpc1.com",
+      "https://rpc2.com",
+      "https://rpc3.com",
+    ]);
+  });
+
+  afterEach(() => {
+    manager.stopHealthChecks();
+    vi.unstubAllGlobals();
+  });
+
+  it("initializes with first endpoint as active", () => {
+    expect(manager.getActiveEndpoint()).toBe("https://rpc1.com");
+  });
+
+  it("returns health status for all endpoints", () => {
+    const status = manager.getHealthStatus();
+    expect(status.totalEndpoints).toBe(3);
+    expect(status.endpoints.length).toBe(3);
+    expect(status.endpoints[0].url).toBe("https://rpc1.com");
+    expect(status.endpoints[0].status).toBe("unknown");
+  });
+
+  it("allows manual setting of active endpoint", () => {
+    expect(manager.setActiveEndpoint("https://rpc2.com")).toBe(true);
+    expect(manager.getActiveEndpoint()).toBe("https://rpc2.com");
+  });
+
+  it("rejects setting invalid endpoint", () => {
+    expect(manager.setActiveEndpoint("https://invalid.com")).toBe(false);
+    expect(manager.getActiveEndpoint()).toBe("https://rpc1.com");
+  });
+
+  it("selects best endpoint after health checks", async () => {
+    // Mock: rpc1 unhealthy, rpc2 degraded, rpc3 healthy
+    let callCount = 0;
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockImplementation(
+      async (url: string) => {
+        callCount++;
+        if (url === "https://rpc1.com") {
+          return {
+            ok: false,
+            status: 500,
+          };
+        }
+        if (url === "https://rpc2.com") {
+          await new Promise((resolve) => setTimeout(resolve, 1500));
+          return {
+            ok: true,
+            json: async () => ({
+              jsonrpc: "2.0",
+              id: 1,
+              result: "0x123456",
+            }),
+          };
+        }
+        if (url === "https://rpc3.com") {
+          return {
+            ok: true,
+            json: async () => ({
+              jsonrpc: "2.0",
+              id: 1,
+              result: "0x123456",
+            }),
+          };
+        }
+        throw new Error("Unexpected URL");
+      }
+    );
+
+    await manager.runHealthChecks();
+
+    const status = manager.getHealthStatus();
+    expect(status.endpoints.find((e) => e.url === "https://rpc1.com")?.status).toBe("unhealthy");
+    expect(status.endpoints.find((e) => e.url === "https://rpc2.com")?.status).toBe("degraded");
+    expect(status.endpoints.find((e) => e.url === "https://rpc3.com")?.status).toBe("healthy");
+    expect(manager.getActiveEndpoint()).toBe("https://rpc3.com");
+  });
+
+  it("makes RPC calls using active endpoint", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({
+        jsonrpc: "2.0",
+        id: 1,
+        result: "0xabcdef",
+      }),
+    });
+
+    const result = await manager.call<string>("eth_blockNumber", []);
+    expect(result).toBe("0xabcdef");
+    expect(globalThis.fetch).toHaveBeenCalledWith(
+      "https://rpc1.com",
+      expect.any(Object)
+    );
+  });
+
+  it("fails over to next endpoint when active fails", async () => {
+    let callCount = 0;
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockImplementation(
+      async (url: string) => {
+        callCount++;
+        if (url === "https://rpc1.com") {
+          return {
+            ok: false,
+            status: 500,
+          };
+        }
+        if (url === "https://rpc2.com") {
+          return {
+            ok: true,
+            json: async () => ({
+              jsonrpc: "2.0",
+              id: 1,
+              result: "0x123456",
+            }),
+          };
+        }
+        throw new Error("Unexpected URL");
+      }
+    );
+
+    const result = await manager.call<string>("eth_blockNumber", []);
+    expect(result).toBe("0x123456");
+    expect(manager.getActiveEndpoint()).toBe("https://rpc2.com");
+  });
+
+  it("tracks consecutive failures", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+      ok: false,
+      status: 500,
+    });
+
+    await manager.runHealthChecks();
+    const endpoint = manager.getHealthStatus().endpoints.find(
+      (e) => e.url === "https://rpc1.com"
+    );
+    expect(endpoint?.consecutiveFailures).toBe(1);
+
+    await manager.runHealthChecks();
+    const endpoint2 = manager.getHealthStatus().endpoints.find(
+      (e) => e.url === "https://rpc1.com"
+    );
+    expect(endpoint2?.consecutiveFailures).toBe(2);
+  });
+
+  it("resets consecutive failures on success", async () => {
+    // First, make it fail
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
+      ok: false,
+      status: 500,
+    });
+    await manager.runHealthChecks();
+    const endpoint1 = manager.getHealthStatus().endpoints.find(
+      (e) => e.url === "https://rpc1.com"
+    );
+    expect(endpoint1?.consecutiveFailures).toBe(1);
+
+    // Then make it succeed
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({
+        jsonrpc: "2.0",
+        id: 1,
+        result: "0x123456",
+      }),
+    });
+    await manager.runHealthChecks();
+    const endpoint2 = manager.getHealthStatus().endpoints.find(
+      (e) => e.url === "https://rpc1.com"
+    );
+    expect(endpoint2?.consecutiveFailures).toBe(0);
+  });
+
+  it("updates lastCheck timestamp", async () => {
+    (globalThis.fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+      ok: true,
+      json: async () => ({
+        jsonrpc: "2.0",
+        id: 1,
+        result: "0x123456",
+      }),
+    });
+
+    const before = Date.now();
+    await manager.runHealthChecks();
+    const after = Date.now();
+
+    const endpoint = manager.getHealthStatus().endpoints[0];
+    expect(endpoint.lastCheck).toBeGreaterThanOrEqual(before);
+    expect(endpoint.lastCheck).toBeLessThanOrEqual(after);
+  });
+
+  it("handles empty URL list", () => {
+    const emptyManager = new RpcFailoverManager([]);
+    expect(emptyManager.getActiveEndpoint()).toBeNull();
+    const status = emptyManager.getHealthStatus();
+    expect(status.totalEndpoints).toBe(0);
+  });
+});
diff --git a/typescript/rpc-health-failover-system/app.ts b/typescript/rpc-health-failover-system/app.ts
new file mode 100644
index 0000000..8031169
--- /dev/null
+++ b/typescript/rpc-health-failover-system/app.ts
@@ -0,0 +1,396 @@
+/**
+ * RPC Health Failover System — BSC RPC endpoint health monitoring and automatic failover.
+ * Monitors multiple BSC RPC endpoints, checks their health, and automatically switches
+ * to the best available endpoint when one fails or becomes slow.
+ */
+
+import express from "express";
+import { readFileSync } from "fs";
+import { dirname, join } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+const PORT = Number(process.env.PORT) || 3000;
+const HEALTH_CHECK_INTERVAL_MS = Number(process.env.HEALTH_CHECK_INTERVAL_MS) || 5000;
+const RPC_TIMEOUT_MS = Number(process.env.RPC_TIMEOUT_MS) || 3000;
+
+// Parse RPC URLs from env (comma-separated)
+const RPC_URLS_ENV = process.env.BSC_RPC_URLS || "https://bsc-dataseed.bnbchain.org,https://bsc-dataseed1.defibit.io,https://bsc-dataseed1.ninicoin.io";
+const RPC_URLS = RPC_URLS_ENV.split(",").map((url) => url.trim()).filter(Boolean);
+
+export type RpcStatus = "healthy" | "degraded" | "unhealthy" | "unknown";
+
+export interface RpcEndpoint {
+  url: string;
+  status: RpcStatus;
+  latencyMs: number | null;
+  lastCheck: number | null;
+  lastError: string | null;
+  consecutiveFailures: number;
+  lastBlockNumber: number | null;
+}
+
+export interface HealthStatus {
+  endpoints: RpcEndpoint[];
+  activeEndpoint: string | null;
+  totalEndpoints: number;
+  healthyCount: number;
+  degradedCount: number;
+  unhealthyCount: number;
+}
+
+/** Make an RPC call with timeout. */
+async function rpcCall<T>(url: string, method: string, params: unknown[]): Promise<T> {
+  const controller = new AbortController();
+  const timeoutId = setTimeout(() => controller.abort(), RPC_TIMEOUT_MS);
+
+  try {
+    const t0 = Date.now();
+    const res = await fetch(url, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        jsonrpc: "2.0",
+        id: 1,
+        method,
+        params,
+      }),
+      signal: controller.signal,
+    });
+    const elapsed = Date.now() - t0;
+
+    clearTimeout(timeoutId);
+
+    if (!res.ok) {
+      throw new Error(`HTTP ${res.status}`);
+    }
+
+    const json = (await res.json()) as { result?: T; error?: { message: string } };
+    if (json.error) {
+      throw new Error(json.error.message);
+    }
+    if (!("result" in json)) {
+      throw new Error("Missing RPC result");
+    }
+
+    return json.result as T;
+  } catch (e) {
+    clearTimeout(timeoutId);
+    if (e instanceof Error && e.name === "AbortError") {
+      throw new Error("Request timeout");
+    }
+    throw e;
+  }
+}
+
+/** Get block number from RPC endpoint. */
+async function getBlockNumber(url: string): Promise<number> {
+  const hex = await rpcCall<string>(url, "eth_blockNumber", []);
+  return parseInt(hex, 16);
+}
+
+/** Check health of a single RPC endpoint. */
+export async function checkEndpointHealth(url: string): Promise<{
+  status: RpcStatus;
+  latencyMs: number | null;
+  error: string | null;
+  blockNumber: number | null;
+}> {
+  const t0 = Date.now();
+  try {
+    const blockNumber = await getBlockNumber(url);
+    const latencyMs = Date.now() - t0;
+
+    // Healthy: latency < 1000ms
+    // Degraded: latency 1000-3000ms
+    // Unhealthy: latency > 3000ms or error
+    let status: RpcStatus = "healthy";
+    if (latencyMs >= 3000) {
+      status = "unhealthy";
+    } else if (latencyMs >= 1000) {
+      status = "degraded";
+    }
+
+    return {
+      status,
+      latencyMs,
+      error: null,
+      blockNumber,
+    };
+  } catch (e) {
+    const latencyMs = Date.now() - t0;
+    const error = e instanceof Error ? e.message : "Unknown error";
+    return {
+      status: "unhealthy",
+      latencyMs: latencyMs >= RPC_TIMEOUT_MS ? null : latencyMs,
+      error,
+      blockNumber: null,
+    };
+  }
+}
+
+/** RPC endpoint manager with health monitoring and failover. */
+export class RpcFailoverManager {
+  private endpoints: Map<string, RpcEndpoint> = new Map();
+  private activeUrl: string | null = null;
+  private healthCheckInterval: NodeJS.Timeout | null = null;
+
+  constructor(urls: string[]) {
+    for (const url of urls) {
+      this.endpoints.set(url, {
+        url,
+        status: "unknown",
+        latencyMs: null,
+        lastCheck: null,
+        lastError: null,
+        consecutiveFailures: 0,
+        lastBlockNumber: null,
+      });
+    }
+    // Set first endpoint as active initially
+    if (urls.length > 0) {
+      this.activeUrl = urls[0];
+    }
+  }
+
+  /** Start periodic health checks. */
+  startHealthChecks(): void {
+    if (this.healthCheckInterval) {
+      return;
+    }
+    // Run initial check immediately
+    this.runHealthChecks();
+    // Then run periodically
+    this.healthCheckInterval = setInterval(() => {
+      this.runHealthChecks();
+    }, HEALTH_CHECK_INTERVAL_MS);
+  }
+
+  /** Stop health checks. */
+  stopHealthChecks(): void {
+    if (this.healthCheckInterval) {
+      clearInterval(this.healthCheckInterval);
+      this.healthCheckInterval = null;
+    }
+  }
+
+  /** Run health checks on all endpoints. */
+  async runHealthChecks(): Promise<void> {
+    const checks = Array.from(this.endpoints.keys()).map(async (url) => {
+      const endpoint = this.endpoints.get(url)!;
+      const health = await checkEndpointHealth(url);
+
+      endpoint.status = health.status;
+      endpoint.latencyMs = health.latencyMs;
+      endpoint.lastCheck = Date.now();
+      endpoint.lastError = health.error;
+      endpoint.lastBlockNumber = health.blockNumber;
+
+      if (health.status === "unhealthy") {
+        endpoint.consecutiveFailures += 1;
+      } else {
+        endpoint.consecutiveFailures = 0;
+      }
+    });
+
+    await Promise.allSettled(checks);
+    this.selectBestEndpoint();
+  }
+
+  /** Select the best available endpoint (healthy > degraded > unhealthy). */
+  selectBestEndpoint(): void {
+    const endpoints = Array.from(this.endpoints.values());
+
+    // Sort by: status priority (healthy > degraded > unhealthy), then by latency
+    const sorted = endpoints.sort((a, b) => {
+      const statusPriority: Record<RpcStatus, number> = {
+        healthy: 0,
+        degraded: 1,
+        unhealthy: 2,
+        unknown: 3,
+      };
+      const aPriority = statusPriority[a.status];
+      const bPriority = statusPriority[b.status];
+      if (aPriority !== bPriority) {
+        return aPriority - bPriority;
+      }
+      // If same status, prefer lower latency
+      const aLatency = a.latencyMs ?? Infinity;
+      const bLatency = b.latencyMs ?? Infinity;
+      return aLatency - bLatency;
+    });
+
+    const best = sorted[0];
+    if (best && best.status !== "unknown") {
+      this.activeUrl = best.url;
+    }
+  }
+
+  /** Get current active endpoint URL. */
+  getActiveEndpoint(): string | null {
+    return this.activeUrl;
+  }
+
+  /** Manually set active endpoint. */
+  setActiveEndpoint(url: string): boolean {
+    if (this.endpoints.has(url)) {
+      this.activeUrl = url;
+      return true;
+    }
+    return false;
+  }
+
+  /** Get health status of all endpoints. */
+  getHealthStatus(): HealthStatus {
+    const endpoints = Array.from(this.endpoints.values());
+    const healthyCount = endpoints.filter((e) => e.status === "healthy").length;
+    const degradedCount = endpoints.filter((e) => e.status === "degraded").length;
+    const unhealthyCount = endpoints.filter((e) => e.status === "unhealthy").length;
+
+    return {
+      endpoints,
+      activeEndpoint: this.activeUrl,
+      totalEndpoints: endpoints.length,
+      healthyCount,
+      degradedCount,
+      unhealthyCount,
+    };
+  }
+
+  /** Make an RPC call using the active endpoint, with automatic failover. */
+  async call<T>(method: string, params: unknown[]): Promise<T> {
+    const activeUrl = this.getActiveEndpoint();
+    if (!activeUrl) {
+      throw new Error("No active RPC endpoint available");
+    }
+
+    try {
+      return await rpcCall<T>(activeUrl, method, params);
+    } catch (e) {
+      // If active endpoint fails, mark it unhealthy
+      const endpoint = this.endpoints.get(activeUrl);
+      if (endpoint) {
+        endpoint.status = "unhealthy";
+        endpoint.consecutiveFailures += 1;
+        endpoint.lastError = e instanceof Error ? e.message : "Unknown error";
+        endpoint.lastCheck = Date.now();
+      }
+      
+      // Try to find another endpoint (even if unknown)
+      const endpoints = Array.from(this.endpoints.values());
+      const otherEndpoints = endpoints.filter((e) => e.url !== activeUrl);
+      
+      // Sort by status priority, preferring known good endpoints
+      const sorted = otherEndpoints.sort((a, b) => {
+        const statusPriority: Record<RpcStatus, number> = {
+          healthy: 0,
+          degraded: 1,
+          unhealthy: 2,
+          unknown: 3,
+        };
+        return statusPriority[a.status] - statusPriority[b.status];
+      });
+
+      // Try each endpoint in order
+      for (const ep of sorted) {
+        try {
+          const result = await rpcCall<T>(ep.url, method, params);
+          // Success! Update this endpoint and set it as active
+          ep.status = "healthy";
+          ep.consecutiveFailures = 0;
+          ep.lastError = null;
+          ep.lastCheck = Date.now();
+          this.activeUrl = ep.url;
+          return result;
+        } catch (err) {
+          // Mark this endpoint as unhealthy and continue
+          ep.status = "unhealthy";
+          ep.consecutiveFailures += 1;
+          ep.lastError = err instanceof Error ? err.message : "Unknown error";
+          ep.lastCheck = Date.now();
+        }
+      }
+
+      // All endpoints failed
+      throw new Error(`RPC call failed on all endpoints. Last error on ${activeUrl}: ${e instanceof Error ? e.message : "Unknown error"}`);
+    }
+  }
+}
+
+// Global manager instance
+let rpcManager: RpcFailoverManager | null = null;
+
+function main(): void {
+  const app = express();
+  app.use(express.json());
+
+  // Initialize RPC manager
+  rpcManager = new RpcFailoverManager(RPC_URLS);
+  rpcManager.startHealthChecks();
+
+  // Serve frontend
+  app.get("/", (_req, res) => {
+    res.setHeader("Content-Type", "text/html; charset=utf-8");
+    res.send(readFileSync(join(__dirname, "..", "frontend.html"), "utf-8"));
+  });
+
+  // Get health status
+  app.get("/api/health", (_req, res) => {
+    if (!rpcManager) {
+      res.status(500).json({ error: "RPC manager not initialized" });
+      return;
+    }
+    res.json(rpcManager.getHealthStatus());
+  });
+
+  // Set active endpoint manually
+  app.post("/api/set-active", (req, res) => {
+    if (!rpcManager) {
+      res.status(500).json({ error: "RPC manager not initialized" });
+      return;
+    }
+    const { url } = req.body;
+    if (!url || typeof url !== "string") {
+      res.status(400).json({ error: "Missing or invalid 'url' in request body" });
+      return;
+    }
+    const success = rpcManager.setActiveEndpoint(url);
+    if (!success) {
+      res.status(400).json({ error: "Endpoint not found in configured URLs" });
+      return;
+    }
+    res.json({ success: true, activeEndpoint: url });
+  });
+
+  // Make a test RPC call using active endpoint
+  app.get("/api/test-call", async (_req, res) => {
+    if (!rpcManager) {
+      res.status(500).json({ error: "RPC manager not initialized" });
+      return;
+    }
+    try {
+      const blockNumber = await rpcManager.call<string>("eth_blockNumber", []);
+      const blockNumberDecimal = parseInt(blockNumber, 16);
+      res.json({
+        success: true,
+        activeEndpoint: rpcManager.getActiveEndpoint(),
+        blockNumber: blockNumberDecimal,
+        blockNumberHex: blockNumber,
+      });
+    } catch (e) {
+      res.status(500).json({
+        error: e instanceof Error ? e.message : "RPC call failed",
+        activeEndpoint: rpcManager.getActiveEndpoint(),
+      });
+    }
+  });
+
+  app.listen(PORT, () => {
+    console.log(`RPC Health Failover System running at http://localhost:${PORT}`);
+    console.log(`Monitoring ${RPC_URLS.length} RPC endpoints:`);
+    RPC_URLS.forEach((url) => console.log(`  - ${url}`));
+  });
+}
+
+if (process.env.VITEST !== "true") main();
diff --git a/typescript/rpc-health-failover-system/clone-and-run.sh b/typescript/rpc-health-failover-system/clone-and-run.sh
new file mode 100644
index 0000000..ce11b4c
--- /dev/null
+++ b/typescript/rpc-health-failover-system/clone-and-run.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "[1/5] Creating .env..."
+cat > .env << 'EOF'
+BSC_RPC_URLS=https://bsc-dataseed.bnbchain.org,https://bsc-dataseed1.defibit.io,https://bsc-dataseed1.ninicoin.io
+HEALTH_CHECK_INTERVAL_MS=5000
+RPC_TIMEOUT_MS=3000
+PORT=3000
+EOF
+
+echo "[2/5] Installing dependencies..."
+npm install
+
+echo "[3/5] Building..."
+npm run build
+
+echo "[4/5] Running tests..."
+npm test
+
+echo "[5/5] Starting server..."
+echo ""
+echo "  → App: http://localhost:3000"
+echo "  → Stop: Ctrl+C"
+echo ""
+set -a
+# shellcheck disable=SC1091
+source .env
+set +a
+npm start
diff --git a/typescript/rpc-health-failover-system/frontend.html b/typescript/rpc-health-failover-system/frontend.html
new file mode 100644
index 0000000..3544312
--- /dev/null
+++ b/typescript/rpc-health-failover-system/frontend.html
@@ -0,0 +1,526 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <title>RPC Health Failover System — BSC</title>
+  <link rel="preconnect" href="https://fonts.googleapis.com" />
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+  <link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600&family=Outfit:wght@400;500;600;700&display=swap" rel="stylesheet" />
+  <style>
+    :root {
+      --bg: #0d0f14;
+      --surface: #151922;
+      --surface2: #1c212c;
+      --border: #2a3142;
+      --text: #e4e8f0;
+      --textDim: #8b95a8;
+      --accent: #00d4aa;
+      --accentDim: #00a884;
+      --danger: #ff6b6b;
+      --warn: #ffc857;
+      --ok: #00d4aa;
+      --degraded: #ffc857;
+    }
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+    body {
+      font-family: 'Outfit', system-ui, sans-serif;
+      background: var(--bg);
+      color: var(--text);
+      min-height: 100vh;
+      line-height: 1.5;
+    }
+    .layout {
+      display: grid;
+      grid-template-columns: minmax(280px, 380px) 1fr;
+      min-height: 100vh;
+    }
+    @media (max-width: 820px) {
+      .layout { grid-template-columns: 1fr; }
+    }
+    .info {
+      background: var(--surface);
+      border-right: 1px solid var(--border);
+      padding: 1.75rem 1.5rem;
+      overflow-y: auto;
+    }
+    .info h1 {
+      font-size: 1.25rem;
+      font-weight: 700;
+      margin-bottom: 0.5rem;
+      color: var(--accent);
+    }
+    .info .tag {
+      font-size: 0.75rem;
+      color: var(--textDim);
+      margin-bottom: 1.25rem;
+    }
+    .info p {
+      font-size: 0.9rem;
+      color: var(--textDim);
+      margin-bottom: 1rem;
+    }
+    .info h2 {
+      font-size: 0.85rem;
+      font-weight: 600;
+      color: var(--text);
+      margin-top: 1.25rem;
+      margin-bottom: 0.5rem;
+    }
+    .info ul {
+      font-size: 0.85rem;
+      color: var(--textDim);
+      padding-left: 1.25rem;
+      margin-bottom: 1rem;
+    }
+    .info li { margin-bottom: 0.35rem; }
+    .info code {
+      font-family: 'JetBrains Mono', monospace;
+      font-size: 0.8em;
+      background: var(--surface2);
+      padding: 0.15rem 0.4rem;
+      border-radius: 4px;
+      color: var(--accent);
+    }
+    .main {
+      padding: 1.75rem 2rem;
+      overflow-y: auto;
+    }
+    .main h2 {
+      font-size: 1.1rem;
+      font-weight: 600;
+      margin-bottom: 1rem;
+      color: var(--text);
+    }
+    .toolbar {
+      display: flex;
+      gap: 0.75rem;
+      margin-bottom: 1.5rem;
+      flex-wrap: wrap;
+    }
+    .btn {
+      font-family: 'Outfit', sans-serif;
+      font-size: 0.9rem;
+      font-weight: 600;
+      padding: 0.75rem 1.5rem;
+      border: none;
+      border-radius: 8px;
+      cursor: pointer;
+      transition: transform 0.1s, background 0.2s;
+    }
+    .btn-primary {
+      background: var(--accent);
+      color: var(--bg);
+    }
+    .btn-primary:hover { background: var(--accentDim); }
+    .btn-primary:active { transform: scale(0.98); }
+    .btn-primary:disabled {
+      opacity: 0.6;
+      cursor: not-allowed;
+      transform: none;
+    }
+    .btn-secondary {
+      background: var(--surface2);
+      color: var(--text);
+      border: 1px solid var(--border);
+    }
+    .btn-secondary:hover { background: var(--surface); }
+    .status-summary {
+      display: grid;
+      grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
+      gap: 1rem;
+      margin-bottom: 1.5rem;
+    }
+    .stat-card {
+      background: var(--surface2);
+      border: 1px solid var(--border);
+      border-radius: 8px;
+      padding: 1rem;
+      text-align: center;
+    }
+    .stat-value {
+      font-size: 1.75rem;
+      font-weight: 700;
+      font-family: 'JetBrains Mono', monospace;
+      margin-bottom: 0.25rem;
+    }
+    .stat-label {
+      font-size: 0.75rem;
+      color: var(--textDim);
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+    }
+    .stat-value.healthy { color: var(--ok); }
+    .stat-value.degraded { color: var(--warn); }
+    .stat-value.unhealthy { color: var(--danger); }
+    .endpoints-list {
+      display: flex;
+      flex-direction: column;
+      gap: 0.75rem;
+      margin-bottom: 1.5rem;
+    }
+    .endpoint-card {
+      background: var(--surface2);
+      border: 1px solid var(--border);
+      border-radius: 8px;
+      padding: 1rem 1.25rem;
+      transition: border-color 0.2s;
+    }
+    .endpoint-card.active {
+      border-color: var(--accent);
+      box-shadow: 0 0 0 2px rgba(0,212,170,0.15);
+    }
+    .endpoint-header {
+      display: flex;
+      align-items: center;
+      justify-content: space-between;
+      margin-bottom: 0.75rem;
+      flex-wrap: wrap;
+      gap: 0.5rem;
+    }
+    .endpoint-url {
+      font-family: 'JetBrains Mono', monospace;
+      font-size: 0.85rem;
+      color: var(--text);
+      word-break: break-all;
+      flex: 1;
+      min-width: 200px;
+    }
+    .endpoint-status {
+      display: inline-flex;
+      align-items: center;
+      gap: 0.5rem;
+      font-size: 0.75rem;
+      font-weight: 600;
+      text-transform: uppercase;
+      padding: 0.35rem 0.75rem;
+      border-radius: 6px;
+    }
+    .endpoint-status.healthy {
+      background: rgba(0,212,170,0.2);
+      color: var(--ok);
+    }
+    .endpoint-status.degraded {
+      background: rgba(255,200,87,0.2);
+      color: var(--warn);
+    }
+    .endpoint-status.unhealthy {
+      background: rgba(255,107,107,0.2);
+      color: var(--danger);
+    }
+    .endpoint-status.unknown {
+      background: rgba(139,149,168,0.2);
+      color: var(--textDim);
+    }
+    .endpoint-meta {
+      display: grid;
+      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
+      gap: 0.75rem;
+      font-size: 0.85rem;
+      color: var(--textDim);
+    }
+    .endpoint-meta-item {
+      display: flex;
+      flex-direction: column;
+      gap: 0.25rem;
+    }
+    .endpoint-meta-label {
+      font-size: 0.75rem;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+    }
+    .endpoint-meta-value {
+      font-family: 'JetBrains Mono', monospace;
+      color: var(--text);
+    }
+    .endpoint-actions {
+      margin-top: 0.75rem;
+      display: flex;
+      gap: 0.5rem;
+    }
+    .btn-small {
+      font-size: 0.8rem;
+      padding: 0.5rem 1rem;
+    }
+    .active-badge {
+      display: inline-block;
+      background: var(--accent);
+      color: var(--bg);
+      font-size: 0.7rem;
+      font-weight: 600;
+      padding: 0.25rem 0.5rem;
+      border-radius: 4px;
+      margin-left: 0.5rem;
+    }
+    .message {
+      font-size: 0.9rem;
+      padding: 1rem;
+      border-radius: 8px;
+      margin-bottom: 1rem;
+    }
+    .message.error {
+      background: rgba(255,107,107,0.12);
+      border: 1px solid rgba(255,107,107,0.35);
+      color: var(--danger);
+    }
+    .message.success {
+      background: rgba(0,212,170,0.12);
+      border: 1px solid rgba(0,212,170,0.35);
+      color: var(--ok);
+    }
+    .message.info {
+      background: rgba(0,212,170,0.08);
+      border: 1px solid rgba(0,212,170,0.25);
+      color: var(--accent);
+    }
+    .pulse {
+      display: inline-block;
+      width: 8px;
+      height: 8px;
+      border-radius: 50%;
+      background: var(--ok);
+      animation: pulse 2s infinite;
+    }
+    @keyframes pulse {
+      0%, 100% { opacity: 1; }
+      50% { opacity: 0.5; }
+    }
+  </style>
+</head>
+<body>
+  <div class="layout">
+    <aside class="info">
+      <h1>RPC Health Failover System</h1>
+      <p class="tag">BSC · Automatic RPC failover</p>
+      <p>
+        This demo monitors multiple <strong>BNB Smart Chain (BSC)</strong> RPC endpoints,
+        checks their health in real-time, and automatically fails over to the best available
+        endpoint when one becomes slow or unavailable.
+      </p>
+      <h2>How it works</h2>
+      <ul>
+        <li><strong>Health checks</strong> — Periodically tests each RPC endpoint by fetching the latest block number.</li>
+        <li><strong>Status tracking</strong> — Monitors latency, errors, and consecutive failures for each endpoint.</li>
+        <li><strong>Automatic failover</strong> — Switches to the best available endpoint when the current one fails or degrades.</li>
+        <li><strong>Manual override</strong> — You can manually select any endpoint if needed.</li>
+      </ul>
+      <h2>Status levels</h2>
+      <ul>
+        <li><strong>Healthy</strong> — Latency &lt; 1000ms, responding correctly.</li>
+        <li><strong>Degraded</strong> — Latency 1000–3000ms, still functional but slow.</li>
+        <li><strong>Unhealthy</strong> — Latency &gt; 3000ms or errors, not recommended.</li>
+      </ul>
+      <h2>Why it matters</h2>
+      <p>
+        RPC endpoints can become slow or unavailable due to network issues, rate limits, or maintenance.
+        Automatic failover ensures your application stays connected to BSC even when individual endpoints fail.
+      </p>
+    </aside>
+    <main class="main">
+      <h2>RPC Endpoint Status</h2>
+      <div class="toolbar">
+        <button type="button" class="btn btn-primary" id="refresh">Refresh status</button>
+        <button type="button" class="btn btn-secondary" id="test-call">Test RPC call</button>
+      </div>
+      <div id="message" class="message" style="display: none;"></div>
+      <div class="status-summary" id="summary" style="display: none;">
+        <div class="stat-card">
+          <div class="stat-value healthy" id="stat-healthy">0</div>
+          <div class="stat-label">Healthy</div>
+        </div>
+        <div class="stat-card">
+          <div class="stat-value degraded" id="stat-degraded">0</div>
+          <div class="stat-label">Degraded</div>
+        </div>
+        <div class="stat-card">
+          <div class="stat-value unhealthy" id="stat-unhealthy">0</div>
+          <div class="stat-label">Unhealthy</div>
+        </div>
+        <div class="stat-card">
+          <div class="stat-value" id="stat-total">0</div>
+          <div class="stat-label">Total</div>
+        </div>
+      </div>
+      <div class="endpoints-list" id="endpoints"></div>
+    </main>
+  </div>
+  <script>
+    (function () {
+      const refreshBtn = document.getElementById('refresh');
+      const testCallBtn = document.getElementById('test-call');
+      const messageEl = document.getElementById('message');
+      const summaryEl = document.getElementById('summary');
+      const endpointsEl = document.getElementById('endpoints');
+      const statHealthyEl = document.getElementById('stat-healthy');
+      const statDegradedEl = document.getElementById('stat-degraded');
+      const statUnhealthyEl = document.getElementById('stat-unhealthy');
+      const statTotalEl = document.getElementById('stat-total');
+
+      let autoRefreshInterval = null;
+
+      function showMessage(text, type) {
+        messageEl.textContent = text;
+        messageEl.className = 'message ' + (type || '');
+        messageEl.style.display = 'block';
+        setTimeout(() => {
+          messageEl.style.display = 'none';
+        }, 5000);
+      }
+
+      function hideMessage() {
+        messageEl.style.display = 'none';
+      }
+
+      function formatTime(ms) {
+        if (ms === null) return '—';
+        const seconds = Math.floor(ms / 1000);
+        if (seconds < 60) return `${seconds}s ago`;
+        const minutes = Math.floor(seconds / 60);
+        return `${minutes}m ago`;
+      }
+
+      function formatLatency(ms) {
+        if (ms === null) return '—';
+        if (ms < 1000) return `${ms}ms`;
+        return `${(ms / 1000).toFixed(2)}s`;
+      }
+
+      function formatBlockNumber(num) {
+        if (num === null) return '—';
+        return num.toLocaleString();
+      }
+
+      async function loadHealthStatus() {
+        try {
+          const res = await fetch('/api/health');
+          if (!res.ok) {
+            throw new Error('Failed to fetch health status');
+          }
+          const data = await res.json();
+          renderStatus(data);
+        } catch (e) {
+          showMessage('Failed to load health status: ' + (e.message || 'Unknown error'), 'error');
+        }
+      }
+
+      function renderStatus(data) {
+        // Update summary
+        statHealthyEl.textContent = data.healthyCount || 0;
+        statDegradedEl.textContent = data.degradedCount || 0;
+        statUnhealthyEl.textContent = data.unhealthyCount || 0;
+        statTotalEl.textContent = data.totalEndpoints || 0;
+        summaryEl.style.display = 'grid';
+
+        // Render endpoints
+        endpointsEl.innerHTML = '';
+        for (const endpoint of data.endpoints) {
+          const isActive = endpoint.url === data.activeEndpoint;
+          const card = document.createElement('div');
+          card.className = 'endpoint-card' + (isActive ? ' active' : '');
+
+          const statusClass = endpoint.status || 'unknown';
+          const statusLabel = endpoint.status ? endpoint.status.charAt(0).toUpperCase() + endpoint.status.slice(1) : 'Unknown';
+
+          card.innerHTML = `
+            <div class="endpoint-header">
+              <div class="endpoint-url">${escapeHtml(endpoint.url)}${isActive ? '<span class="active-badge">ACTIVE</span>' : ''}</div>
+              <span class="endpoint-status ${statusClass}">
+                ${endpoint.status === 'healthy' ? '<span class="pulse"></span>' : ''}
+                ${statusLabel}
+              </span>
+            </div>
+            <div class="endpoint-meta">
+              <div class="endpoint-meta-item">
+                <span class="endpoint-meta-label">Latency</span>
+                <span class="endpoint-meta-value">${formatLatency(endpoint.latencyMs)}</span>
+              </div>
+              <div class="endpoint-meta-item">
+                <span class="endpoint-meta-label">Last check</span>
+                <span class="endpoint-meta-value">${formatTime(endpoint.lastCheck ? Date.now() - endpoint.lastCheck : null)}</span>
+              </div>
+              <div class="endpoint-meta-item">
+                <span class="endpoint-meta-label">Block #</span>
+                <span class="endpoint-meta-value">${formatBlockNumber(endpoint.lastBlockNumber)}</span>
+              </div>
+              <div class="endpoint-meta-item">
+                <span class="endpoint-meta-label">Failures</span>
+                <span class="endpoint-meta-value">${endpoint.consecutiveFailures || 0}</span>
+              </div>
+            </div>
+            ${endpoint.lastError ? `<div style="margin-top: 0.5rem; font-size: 0.8rem; color: var(--danger);">Error: ${escapeHtml(endpoint.lastError)}</div>` : ''}
+            <div class="endpoint-actions">
+              <button type="button" class="btn btn-secondary btn-small set-active-btn" data-url="${escapeHtml(endpoint.url)}">
+                Set as active
+              </button>
+            </div>
+          `;
+
+          endpointsEl.appendChild(card);
+        }
+
+        // Attach event listeners for set-active buttons
+        document.querySelectorAll('.set-active-btn').forEach(btn => {
+          btn.addEventListener('click', async function() {
+            const url = this.getAttribute('data-url');
+            try {
+              const res = await fetch('/api/set-active', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ url })
+              });
+              const data = await res.json();
+              if (res.ok) {
+                showMessage('Active endpoint set to ' + url, 'success');
+                loadHealthStatus();
+              } else {
+                showMessage(data.error || 'Failed to set active endpoint', 'error');
+              }
+            } catch (e) {
+              showMessage('Network error', 'error');
+            }
+          });
+        });
+      }
+
+      function escapeHtml(s) {
+        const div = document.createElement('div');
+        div.textContent = s;
+        return div.innerHTML;
+      }
+
+      refreshBtn.addEventListener('click', function() {
+        loadHealthStatus();
+      });
+
+      testCallBtn.addEventListener('click', async function() {
+        testCallBtn.disabled = true;
+        showMessage('Testing RPC call...', 'info');
+        try {
+          const res = await fetch('/api/test-call');
+          const data = await res.json();
+          if (res.ok) {
+            showMessage(`Success! Block #${data.blockNumber.toLocaleString()} (${data.blockNumberHex}) via ${data.activeEndpoint}`, 'success');
+          } else {
+            showMessage(data.error || 'RPC call failed', 'error');
+          }
+        } catch (e) {
+          showMessage('Network error', 'error');
+        } finally {
+          testCallBtn.disabled = false;
+        }
+      });
+
+      // Auto-refresh every 5 seconds
+      loadHealthStatus();
+      autoRefreshInterval = setInterval(loadHealthStatus, 5000);
+
+      // Cleanup on page unload
+      window.addEventListener('beforeunload', function() {
+        if (autoRefreshInterval) {
+          clearInterval(autoRefreshInterval);
+        }
+      });
+    })();
+  </script>
+</body>
+</html>
diff --git a/typescript/rpc-health-failover-system/package-lock.json b/typescript/rpc-health-failover-system/package-lock.json
new file mode 100644
index 0000000..b4674d4
--- /dev/null
+++ b/typescript/rpc-health-failover-system/package-lock.json
@@ -0,0 +1,2934 @@
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+        "@esbuild/linux-ppc64": "0.21.5",
+        "@esbuild/linux-riscv64": "0.21.5",
+        "@esbuild/linux-s390x": "0.21.5",
+        "@esbuild/linux-x64": "0.21.5",
+        "@esbuild/netbsd-x64": "0.21.5",
+        "@esbuild/openbsd-x64": "0.21.5",
+        "@esbuild/sunos-x64": "0.21.5",
+        "@esbuild/win32-arm64": "0.21.5",
+        "@esbuild/win32-ia32": "0.21.5",
+        "@esbuild/win32-x64": "0.21.5"
+      }
+    },
+    "node_modules/vitest": {
+      "version": "2.1.9",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-2.1.9.tgz",
+      "integrity": "sha512-MSmPM9REYqDGBI8439mA4mWhV5sKmDlBKWIYbA3lRb2PTHACE0mgKwA8yQ2xq9vxDTuk4iPrECBAEW2aoFXY0Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "2.1.9",
+        "@vitest/mocker": "2.1.9",
+        "@vitest/pretty-format": "^2.1.9",
+        "@vitest/runner": "2.1.9",
+        "@vitest/snapshot": "2.1.9",
+        "@vitest/spy": "2.1.9",
+        "@vitest/utils": "2.1.9",
+        "chai": "^5.1.2",
+        "debug": "^4.3.7",
+        "expect-type": "^1.1.0",
+        "magic-string": "^0.30.12",
+        "pathe": "^1.1.2",
+        "std-env": "^3.8.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.1",
+        "tinypool": "^1.0.1",
+        "tinyrainbow": "^1.2.0",
+        "vite": "^5.0.0",
+        "vite-node": "2.1.9",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || >=20.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "@vitest/browser": "2.1.9",
+        "@vitest/ui": "2.1.9",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/typescript/rpc-health-failover-system/package.json b/typescript/rpc-health-failover-system/package.json
new file mode 100644
index 0000000..cc34c75
--- /dev/null
+++ b/typescript/rpc-health-failover-system/package.json
@@ -0,0 +1,26 @@
+{
+  "name": "rpc-health-failover-system",
+  "version": "1.0.0",
+  "description": "BSC RPC Health Failover System — monitor and automatically failover between multiple BSC RPC endpoints",
+  "type": "module",
+  "main": "dist/app.js",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/app.js",
+    "test": "vitest run",
+    "dev": "tsx watch app.ts"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "dependencies": {
+    "express": "^4.21.0"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.21",
+    "@types/node": "^22.19.7",
+    "tsx": "^4.19.2",
+    "typescript": "^5.6.3",
+    "vitest": "^2.1.4"
+  }
+}
diff --git a/typescript/rpc-health-failover-system/rpc-health-failover-system.png b/typescript/rpc-health-failover-system/rpc-health-failover-system.png
new file mode 100644
index 0000000..e405c1e
Binary files /dev/null and b/typescript/rpc-health-failover-system/rpc-health-failover-system.png differ
diff --git a/typescript/rpc-health-failover-system/tsconfig.json b/typescript/rpc-health-failover-system/tsconfig.json
new file mode 100644
index 0000000..a76c582
--- /dev/null
+++ b/typescript/rpc-health-failover-system/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "outDir": "dist",
+    "rootDir": ".",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true,
+    "types": ["node"]
+  },
+  "include": ["app.ts"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
+}
diff --git a/typescript/rpc-health-failover-system/vitest.config.ts b/typescript/rpc-health-failover-system/vitest.config.ts
new file mode 100644
index 0000000..d95da2b
--- /dev/null
+++ b/typescript/rpc-health-failover-system/vitest.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from "vitest/config";
+import { resolve } from "path";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["**/*.test.ts"],
+    env: { VITEST: "true" },
+  },
+  resolve: {
+    alias: {
+      "@": resolve(__dirname, "."),
+    },
+  },
+});