Rally has created a tool ecosystem to help enable creators to customize their Creator Coin integrations. One of those tools are APIs which let developers build off basic capabilities of different platforms and websites to enhance a creator’s economy.
Rally has made several different API references open to the public. These can all be found here with a brief description and everything a developer needs to successfully use.
In addition to the public APIs that are available, there are additional tools that require an approved developer status to access, specifically Webhooks and Oauth. To take full advantage of the Rally API you, or your developer, will need to register to become an approved Rally developer. You can get started here.
If you're a creator who needs to be connected to a developer you can get started here.