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

# Signing keys

> The public keys for Reintersect-signed call tokens.

> Reintersect apps are in developer preview. Names and limits can still change before general
> release.

Returns the JSON Web Key Set with the public ES256 keys that Reintersect signs per-call tokens with,
for MCP servers that use `auth: "reintersect"`. It needs no credential, and responses are cached for
five minutes (`cache-control: public, max-age=300`).

```json theme={null}
{
  "keys": [
    { "kty": "EC", "crv": "P-256", "alg": "ES256", "use": "sig", "kid": "…", "x": "…", "y": "…" }
  ]
}
```

`verifyReintersectToken` from `@reintersect/sdk/mcp` fetches and caches these for you. See
[MCP authentication](/mcp/authentication#reintersect-signed-tokens).


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.