dev.21st/mcp
21st.dev
Find UI components and themes, retrieve code, and generate with hosted 21st AI when enabled.
needs auth probed 2026-10-05 · HTTP 401 · Bearer
Streamable HTTP error: Error POSTing to endpoint: {"jsonrpc":"2.0","id":null,"error":{"code":-32001,"message":"Not authenticated - your API key is missing or wa- Endpoint
- https://21st.dev/api/mcp (streamable-http)
- Host
- 21st.dev
- Website
- https://21st.dev/mcp
- Registry
- active, updated 2026-09-09 · registry entry
- Reachable
- 5 of the last 5 probes
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 00:24 | needs auth | ||||
| 2026-10-04 10:00 | needs auth | ||||
| 2026-10-04 07:53 | needs auth | ||||
| 2026-10-03 20:33 | needs auth | ||||
| 2026-10-03 17:50 | needs auth |
Badge and feed
[](https://mcpcost.ulehla.dev/s/dev.21st/mcp)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.