The ThirdFi API is designed with REST. Our API has accepts JSON request bodies, and return JSON responses, and uses standard HTTP response codes, authentication.
You can use the ThirdFi API in Sandbox environment, which doesn't affect your production data or interact with the mainnet smart contracts.
Sandbox Environment: https://sandbox.thirdfi.org
Production Environment: https://api.thirdfi.org
There are some public and private API, which can getting to access the data easily. For the private API, you need to authenticate the API by configuring API keys.