org.402mcp/registry
402MCP.org — HTTP 402 & Agent Payment Registry
Is the 402MCP.org MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-26.
Decode HTTP 402 challenges (L402, x402, MPP) and choose agent payment rails from an open registry.
alive probed 2026-11-15 · unchanged since 2026-10-26 · HTTP 200
- Endpoint
- https://402mcp.org/api/v1/mcp (streamable-http)
- Host
- 402mcp.org
- Protocol
- 2025-11-25
- Reports itself as
- 402mcp.org 1.1.1
- Capabilities
- prompts, resources, tools
- Instructions
- 617 characters
- Of a 1M window
- 0.2 % of a 1M context window
- Count
- 2.4k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 2.5k. The o200k_base estimate is 1.3k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/402MCP/402mcp
- Website
- https://402mcp.org
- Registry
- active, updated 2026-10-16 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.79×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| recommend_payment_rail | 678 | 378 | 28 % |
| decode_402_challenge | 457 | 255 | 19 % |
| search_402_solutions | 391 | 218 | 16 % |
| get_solution | 323 | 180 | 13 % |
| probe_402_support | 219 | 122 | 9 % |
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Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.
Fixed something? Probe it now, with the same steps as the daily run. This page updates with the next daily run.