---
title: "Channel3 UCP catalog profile (versioned)"
method: GET
path: "/.well-known/ucp/{version}"
tags: ["ucp-well-known"]
---

# Channel3 UCP catalog profile (versioned)

`GET /.well-known/ucp/{version}`

## Request

- Base URL: `https://api.trychannel3.com`
- URL: `https://api.trychannel3.com/.well-known/ucp/{version}`
- Auth: none declared

Return the catalog UCP profile for a specific protocol version.

## Path parameters

- `version` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

## Changes

- **2026-06-27** `a5ad3b32ded8`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/channel3-ai/apis/channel3-typescript-api/changes/.well-known/ucp/:version/get.md)

---

[API](https://skmtc.dev/channel3-ai/apis/channel3-typescript-api.md) - [All operations](https://skmtc.dev/channel3-ai/apis/channel3-typescript-api/llms.txt) - [OpenAPI document](https://skmtc.dev/channel3-ai/apis/channel3-typescript-api/revisions/f9f7b422ab5d?raw)