CarbonGuru API reference
Every endpoint lives under https://carbonguru.io/v1/. Each request carries Authorization: Bearer <API key>. Create and revoke keys in the API section of your account, at /my-account/api/. A test key, made in the same place, connects the same way and records every order it posts as a preview. Nothing is bought.
The API overview explains what the API does, what each plan reaches and how to start.