> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anchorage.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication and request signing

> Authenticate every API request and sign sensitive move-money operations with Ed25519.

Every request includes your `Api-Access-Key` header. Sensitive operations—including transfers, withdrawals, and trusted-destination management—additionally require an **Ed25519 request signature**, supplied in the `Api-Signature` and `Api-Timestamp` headers and generated from your private key over the canonical request.

## Base URLs

| Environment | Base URL                               |
| :---------- | :------------------------------------- |
| Production  | `https://api.anchorage.com/v2`         |
| Sandbox     | `https://api.anchorage-staging.com/v2` |

For the exact signing recipe and code samples, see [Signing requests](/knowledge-base/platform/developers/request-signing). For how authentication, keys, and permission groups fit together, see [Setting up](/knowledge-base/platform/developers/setting-up).