Welcome to the API for API Evangelist. Here you can obtain keys for your application that will work across all of my APIs.
I currently offer 4 levels of access to my APIs:
Everyone starts out as retail, where you get 500 free API credits a day, with each API applying credits different. You can request changes to your access via your developer account, under your application settings.
If you have any questions, visit each project page, and use its Github issue management, as all of my project are hosted on Github. Beyond that feel free to directly contact me, as I'm a one man show.;-)