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21st.dev

https://21st.dev/api/mcp

● healthy

conformance: fail

Transport

streamable-http

Auth

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Cost

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How to connect

MCP endpoint (streamable-http)

https://21st.dev/api/mcp

JSON-RPC initialize probe

curl -X POST https://21st.dev/api/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'

Homepage

https://21st.dev/api/mcp

Listed at (mcp-registry)

https://chiark.ai/agents/7032afe9-ba79-4af0-a0cf-2c026bb7b50d