You can register for an API key here: https://exchange.gemini.com/settings/apiOEMS Service ProvidersIf you would like to use our API via an OEMS Service Provider, you may do so pursuant to your User Agreement(s).You agree and understand that any OEMS Service Provider must first be authorized by us to provide OEMS Services, and such authorization will only be granted by us to an OEMS Service Provider that enters into an OEMS Service Provider Agreement with Gemini.