402MCP.org — HTTP 402 & Agent Payment Registry for Claude.ai

org.402mcp/registry

Decode HTTP 402 challenges (L402, x402, MPP) and choose agent payment rails from an open registry.

client:Claude.ai transport:streamable-http runtime:npm tools:7

Install 402MCP.org — HTTP 402 & Agent Payment Registry in Claude.ai

Settings → Connectors → Add custom connector

https://402mcp.org/api/v1/mcp

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

decode_402_challenge
recommend_payment_rail
search_402_solutions
get_solution
get_scheme_reference
probe_402_support
get_best_payment_solution

402MCP.org — HTTP 402 & Agent Payment Registry in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

402MCP.org — HTTP 402 & Agent Payment Registry MCP server