diff --git a/modules/client/.gitignore b/modules/client/.gitignore
index d7c64f83fa..26b6496b86 100644
--- a/modules/client/.gitignore
+++ b/modules/client/.gitignore
@@ -6,4 +6,7 @@ test/apiRoutes.txt
 test/tests.txt
 .env
 *.sw[opq]
-tags
\ No newline at end of file
+tags
+.yalc/
+yalc.lock
+.env
diff --git a/modules/client/.sc-from-rev b/modules/client/.sc-from-rev
new file mode 100644
index 0000000000..9b2ceb7942
--- /dev/null
+++ b/modules/client/.sc-from-rev
@@ -0,0 +1 @@
+310119eb1ee22764b39a0512a44b9b64fbac4022
diff --git a/modules/client/.sc-from-rev-pretty b/modules/client/.sc-from-rev-pretty
new file mode 100644
index 0000000000..313357a616
--- /dev/null
+++ b/modules/client/.sc-from-rev-pretty
@@ -0,0 +1,16 @@
+commit 310119eb1ee22764b39a0512a44b9b64fbac4022
+Merge: 7090322c0 6c984b977
+Author: David Wolever <david@wolever.net>
+Date:   Wed Mar 6 19:39:00 2019 -0500
+
+    Merge pull request #1385 from SpankChain/bignumber-to-string
+    
+    Error if BigNumber.toString is used
+
+On branch develop
+Your branch is up to date with 'origin/develop'.
+
+You are currently bisecting, started from branch 'develop'.
+  (use "git bisect reset" to get back to the original branch)
+
+nothing to commit, working tree clean
diff --git a/modules/client/package-lock.json b/modules/client/package-lock.json
index 9eb71698df..7a30fba64f 100644
--- a/modules/client/package-lock.json
+++ b/modules/client/package-lock.json
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       "dev": true,
       "requires": {
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+        "@sinonjs/samsam": "3.1.1"
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-        "array-from": "^2.1.1",
-        "lodash": "^4.17.11"
+        "@sinonjs/commons": "1.3.0",
+        "array-from": "2.1.1",
+        "lodash": "4.17.11"
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       "dev": true,
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+        "@types/node": "10.12.26"
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       "dev": true,
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-        "@types/chai": "*"
+        "@types/chai": "4.1.7"
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       "dev": true,
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-        "@types/chai": "*"
+        "@types/chai": "4.1.7"
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       "requires": {
-        "@types/bn.js": "*",
-        "@types/node": "*"
+        "@types/bn.js": "4.11.4",
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@@ -88,7 +88,7 @@
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       "dev": true,
       "requires": {
-        "@types/node": "*"
+        "@types/node": "10.12.26"
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@@ -114,7 +114,7 @@
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       "dev": true,
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-        "redux": "^4.0.0"
+        "redux": "4.0.1"
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@@ -123,7 +123,7 @@
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-        "@types/node": "*"
+        "@types/node": "10.12.26"
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@@ -150,8 +150,8 @@
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       "requires": {
-        "@types/bn.js": "*",
-        "@types/underscore": "*"
+        "@types/bn.js": "4.11.4",
+        "@types/underscore": "1.8.9"
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@@ -159,7 +159,7 @@
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-        "mime-types": "~2.1.18",
+        "mime-types": "2.1.22",
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@@ -173,10 +173,10 @@
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-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
-        "uri-js": "^4.2.2"
+        "fast-deep-equal": "2.0.1",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.4.1",
+        "uri-js": "4.2.2"
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@@ -185,7 +185,7 @@
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-        "color-convert": "^1.9.0"
+        "color-convert": "1.9.3"
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@@ -199,7 +199,7 @@
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       "dev": true,
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-        "typical": "^2.6.1"
+        "typical": "2.6.1"
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@@ -224,7 +224,7 @@
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-        "safer-buffer": "~2.1.0"
+        "safer-buffer": "2.1.2"
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@@ -232,9 +232,9 @@
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-        "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0"
+        "bn.js": "4.11.8",
+        "inherits": "2.0.3",
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@@ -288,7 +288,7 @@
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       "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
       "requires": {
-        "tweetnacl": "^0.14.3"
+        "tweetnacl": "0.14.5"
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@@ -309,7 +309,7 @@
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@@ -345,15 +345,15 @@
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+        "content-type": "1.0.4",
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-        "depd": "~1.1.2",
-        "http-errors": "~1.6.3",
+        "depd": "1.1.2",
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@@ -381,12 +381,12 @@
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-        "inherits": "^2.0.1",
-        "safe-buffer": "^5.0.1"
+        "buffer-xor": "1.0.3",
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-        "inherits": "^2.0.1",
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+        "global": "4.3.2",
+        "is-function": "1.0.1",
+        "parse-headers": "2.0.1",
+        "xtend": "4.0.1"
       }
     },
     "xhr-request": {
@@ -3399,13 +3397,13 @@
       "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
       "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
       "requires": {
-        "buffer-to-arraybuffer": "^0.0.5",
-        "object-assign": "^4.1.1",
-        "query-string": "^5.0.1",
-        "simple-get": "^2.7.0",
-        "timed-out": "^4.0.1",
-        "url-set-query": "^1.0.0",
-        "xhr": "^2.0.4"
+        "buffer-to-arraybuffer": "0.0.5",
+        "object-assign": "4.1.1",
+        "query-string": "5.1.1",
+        "simple-get": "2.8.1",
+        "timed-out": "4.0.1",
+        "url-set-query": "1.0.0",
+        "xhr": "2.5.0"
       }
     },
     "xhr-request-promise": {
@@ -3413,7 +3411,7 @@
       "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.2.tgz",
       "integrity": "sha1-NDxE0e53JrhkgGloLQ+EDIO0Jh0=",
       "requires": {
-        "xhr-request": "^1.0.1"
+        "xhr-request": "1.1.0"
       }
     },
     "xhr2": {
@@ -3427,7 +3425,7 @@
       "resolved": "https://registry.npmjs.org/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz",
       "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
       "requires": {
-        "cookiejar": "^2.1.1"
+        "cookiejar": "2.1.2"
       }
     },
     "xmlhttprequest": {
@@ -3450,8 +3448,8 @@
       "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
       "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
       "requires": {
-        "buffer-crc32": "~0.2.3",
-        "fd-slicer": "~1.1.0"
+        "buffer-crc32": "0.2.13",
+        "fd-slicer": "1.1.0"
       }
     },
     "yn": {
diff --git a/modules/client/src/.Connext.ts.swo b/modules/client/src/.Connext.ts.swo
new file mode 100644
index 0000000000..e8f7fcd887
Binary files /dev/null and b/modules/client/src/.Connext.ts.swo differ
diff --git a/modules/client/src/controllers/.DepositController.ts.swo b/modules/client/src/controllers/.DepositController.ts.swo
new file mode 100644
index 0000000000..0ea9cfc8bf
Binary files /dev/null and b/modules/client/src/controllers/.DepositController.ts.swo differ
diff --git a/modules/client/src/controllers/BuyController.ts b/modules/client/src/controllers/BuyController.ts
index 724e97386b..1e28276083 100644
--- a/modules/client/src/controllers/BuyController.ts
+++ b/modules/client/src/controllers/BuyController.ts
@@ -69,6 +69,7 @@ export default class BuyController extends AbstractController {
           // PUNT on this -- AB
           break
         case 'PT_CHANNEL':
+        case 'PT_CUSTODIAL':
           const chanArgs: PaymentArgs = {
             recipient: 'hub',
             ...payment.amount
@@ -82,7 +83,7 @@ export default class BuyController extends AbstractController {
 
           signedPayments.push({
             ...payment,
-            type: 'PT_CHANNEL',
+            type: payment.type as any,
             update: {
               reason: 'Payment',
               args: chanArgs,
diff --git a/modules/client/src/lib/currency/.CurrencyConvertable.ts.swo b/modules/client/src/lib/currency/.CurrencyConvertable.ts.swo
new file mode 100644
index 0000000000..6d3afd5f05
Binary files /dev/null and b/modules/client/src/lib/currency/.CurrencyConvertable.ts.swo differ
diff --git a/modules/client/src/lib/currency/Currency.test.ts b/modules/client/src/lib/currency/Currency.test.ts
index 5d730a3800..f109b4c37a 100644
--- a/modules/client/src/lib/currency/Currency.test.ts
+++ b/modules/client/src/lib/currency/Currency.test.ts
@@ -2,6 +2,7 @@ import {assert, expect} from 'chai'
 import Currency from './Currency'
 import CurrencyConvertable from './CurrencyConvertable';
 import { CurrencyType } from '../../state/ConnextState/CurrencyTypes'
+import { parameterizedTests } from '../../testing'
 
 describe('Currency', () => {
   it('should return formatted currency', () => {
@@ -53,4 +54,18 @@ describe('Currency', () => {
         .amount
     ).eq('69')
   })
+
+  describe('format', () => {
+    parameterizedTests([
+      { name: 'zeros', input: 1, opts: { showTrailingZeros: true, decimals: 2 }, expected: '$1.00' },
+      { name: 'no zeros 1', input: 1, opts: { showTrailingZeros: false, decimals: 2 }, expected: '$1' },
+      { name: 'no zeros 2', input: 1.1, opts: { showTrailingZeros: false, decimals: 2 }, expected: '$1.1' },
+      { name: 'decimals 1', input: 1.234, opts: { decimals: 2 }, expected: '$1.23' },
+      { name: 'decimals 2', input: 1.234, opts: { decimals: 0 }, expected: '$1' },
+      { name: 'decimals 3', input: 1.234, opts: undefined, expected: '$1.23' },
+      { name: 'intcomma', input: 1234567.89, opts: undefined, expected: '$1,234,567.89' },
+    ], t => {
+      assert.equal(Currency.USD(t.input).format(t.opts), t.expected)
+    })
+  })
 })
diff --git a/modules/client/src/lib/currency/Currency.ts b/modules/client/src/lib/currency/Currency.ts
index 08cd391f4b..b5ec2a2c93 100644
--- a/modules/client/src/lib/currency/Currency.ts
+++ b/modules/client/src/lib/currency/Currency.ts
@@ -159,11 +159,11 @@ export default class Currency<ThisType extends CurrencyType = any> implements IC
     }
 
     let amount = options.decimals === undefined
-      ? amountBigNum.toString(10)
-      : amountBigNum.toNumber().toFixed(options.decimals)
+      ? amountBigNum.toFormat()
+      : amountBigNum.toFormat(options.decimals)
 
     if (!options.showTrailingZeros) {
-      amount = parseFloat(amount).toString()
+      amount = amount.replace(/\.?0*$/, '')
     }
 
     return `${symbol}${amount}`
diff --git a/modules/client/src/register/bignumber.test.ts b/modules/client/src/register/bignumber.test.ts
new file mode 100644
index 0000000000..62ffad03fc
--- /dev/null
+++ b/modules/client/src/register/bignumber.test.ts
@@ -0,0 +1,34 @@
+import { assert } from '../testing'
+import { BigNumber } from 'bignumber.js'
+
+describe('BigNumber', () => {
+  const num = new BigNumber('6.9e69')
+
+  describe('toString', () => {
+    const origNodeEnv = process.env.NODE_ENV
+    afterEach(() => process.env.NODE_ENV = origNodeEnv)
+
+    it('throws an error in test', () => {
+      assert.throws(() => num.toString(), /use .toFixed/i)
+    })
+
+    it('throws an error in development', () => {
+      process.env.NODE_ENV = 'development'
+      assert.throws(() => num.toString(), /use .toFixed/i)
+    })
+
+    it('forces base 10 in production', () => {
+      process.env.NODE_ENV = 'production'
+      assert.match(num.toString(), /690{68}/)
+    })
+  })
+
+  it('uses fixed-point when converting to JSON', () => {
+    assert.match(JSON.stringify([num]), /\["690{68}"\]/)
+  })
+
+  it('uses fixed-point for .valueOf()', () => {
+    assert.match(num.valueOf(), /690{68}/)
+  })
+
+})
diff --git a/modules/client/src/register/bignumber.ts b/modules/client/src/register/bignumber.ts
new file mode 100644
index 0000000000..b9bc149bd7
--- /dev/null
+++ b/modules/client/src/register/bignumber.ts
@@ -0,0 +1,34 @@
+import {BigNumber} from "bignumber.js"
+
+const oldBigNumberToString = BigNumber.prototype.toString
+BigNumber.prototype.toString = function(base?: number) {
+  // BigNumber.toString will only use exponential notation if a base is not
+  // specified. In dev, throw an error so it can be replaced with `.toFixed()`,
+  // or in production, log an error and force base 10.
+  if (!base) {
+    const err = new Error('Potentially unsafe of BigNumber.toString! Use .toFixed() instead.')
+    if (process.env.NODE_ENV != 'staging' && process.env.NODE_ENV != 'production')
+      throw err
+
+    // In production, log an error and force base 10 to ensure the result is
+    // fixed-point.
+    console.error(err.stack)
+    base = 10
+  }
+
+  return oldBigNumberToString.call(this, base)
+}
+
+BigNumber.prototype.toJSON = function() {
+  // By default BigNumber.toJSON will only use exponential notation for
+  // sufficiently large and small numbers. This is undesierable. Instead,
+  // force it to use fixed point.
+  return this.toFixed()
+}
+
+BigNumber.prototype.valueOf = function() {
+  // By default BigNumber.valueOf will only use exponential notation for
+  // sufficiently large and small numbers. This is undesierable. Instead,
+  // force it to use fixed point.
+  return this.toFixed()
+}
diff --git a/modules/client/src/register/common.ts b/modules/client/src/register/common.ts
index a1421337d0..d1815ff20f 100644
--- a/modules/client/src/register/common.ts
+++ b/modules/client/src/register/common.ts
@@ -4,6 +4,8 @@
  * Does some minimal environment configuration.
  */
 
+require('./bignumber.ts')
+
 // Bluebird has the ability to include the entire call stack in a Promise (ie,
 // including the original caller).
 // This incurs a 4x-5x performance penalty, though, so only use it in dev +
diff --git a/modules/client/src/types.ts b/modules/client/src/types.ts
index af1413dfe0..860d0ec621 100644
--- a/modules/client/src/types.ts
+++ b/modules/client/src/types.ts
@@ -945,7 +945,7 @@ Returns:
 
 */
 
-export type PurchasePaymentType = 'PT_CHANNEL' | 'PT_THREAD' | 'PT_LINK'
+export type PurchasePaymentType = 'PT_CHANNEL' | 'PT_THREAD' | 'PT_CUSTODIAL' | 'PT_LINK'
 
 
 export interface PurchaseRequest<MetadataType=any, PaymentMetadataType=any> {
@@ -1000,6 +1000,10 @@ export type PurchasePayment<MetadataType=any> = ({
       // The hub's counter-signed updates will be included in the SyncResponse.
       update: UpdateRequest
     } |
+    {
+      type: 'PT_CUSTODIAL'
+      update: UpdateRequest
+    } |
     {
       type: 'PT_THREAD'
       // See note above