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

# Authentication

All APIs require an authentication token. This token is a secret key that is specific to your app and will be provided to you. Please keep the key secure, as it will allow the holder to [create new wallets](/apis/nft-wallets.md) and [transfer NFTs](/apis/transfers.md) out of wallets as well.

You will need to pass the authentication token in the `"Authorization"` header when making an API call.