---
title: "Introspect Endpoint"
method: POST
path: "/introspect"
tags: ["mcp_discoverable"]
---

# Introspect Endpoint

`POST /introspect`

## Request

- Base URL: `https://api.sea-lion.ai` (the document declares no server; this is the origin it was published from)
- URL: `https://api.sea-lion.ai/introspect`
- Auth: API key in header `x-litellm-api-key`

RFC 7662 introspection for gateway-issued session tokens (``llm_session_`` /
``llm_srefresh_``), so an external gateway can validate them without the signing
secret. The caller authenticates with a LiteLLM virtual key (section 2.1, enforced by
the route dependency); any token the gateway cannot vouch for answers
``{"active": false}`` with no further detail.

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

## Changes

- **2026-10-21** `f2fb14eab3f5`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/sea-lion/apis/litellm-api/changes/introspect/post.md)

---

[API](https://skmtc.dev/sea-lion/apis/litellm-api.md) · [All operations](https://skmtc.dev/sea-lion/apis/litellm-api/llms.txt) · [OpenAPI document](https://skmtc.dev/sea-lion/apis/litellm-api/revisions/1ba9123c189a?raw)