Unable to authenticate with OpenData API Key?

[uBadRequest]

I have a valid api key for querying:
https://us.api.insight.rapid7.com/opendata/studies/

file=$(curl -H "X-Api-Key: $api" "https://us.api.insight.rapid7.com/opendata/studies/sonar.rdns_v2/" --silent | jq -r '.sonarfile_set[0]')

Works just fine... but I can't seem to use this client...
{"error":"Could not authenticate","errors":"Invalid email or password."}

Is there a separate account required for this API?

The company I work at is a Rapid7 customer, and I'm interested in using this to monitor for domain names that contain our brand name.

Is there a chance that this could also support wildcard searches? I'd prefer to not have to constantly download the full list every week and grep it.

Thanks!