> For the complete documentation index, see [llms.txt](https://docs.getdefy.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getdefy.co/authentication.md).

# AUTHENTICATION

- [API Key](https://docs.getdefy.co/authentication/api-key.md): Let's start with Defy Blockchain API