402MCP.org

Registry

Changelog

Additions and corrections to the registry, and the reason for each. Corrections are recorded as prominently as additions. Also available as Atom and JSON.

Nine new entries, sourced corrections, and agent tools

2026.10.15 · 2026-10-15

The registry grows from five entries to fourteen and adds the Machine Payments Protocol as a third scheme. Every entry now carries sources and a last-verified date, and four original entries were corrected against their primary sources.

  • addedMachine Payments Protocol (MPP), the 'Payment' HTTP authentication scheme from Tempo and Stripe. View entry
  • addedStripe Machine Payments (MPP and x402). View entry
  • addedAperture, the reference L402 reverse proxy. View entry
  • addedlnget, an L402-aware command-line HTTP client. View entry
  • addedAlby MCP Server. View entry
  • addedCloudflare Agents SDK (x402). View entry
  • addedthirdweb x402. View entry
  • addedPayAI Network. View entry
  • addedCoinbase Payments MCP. View entry
  • correctedLightning Labs Wavelength: TypeScript examples replaced with commands from the SDK's documentation; marked alpha; tagline matched to the launch post. Rails 9.3 → 8 (no stablecoin settlement today) and DX 9.5 → 8.5 (alpha API churn) move the score from 9.8 to 9.4. View entry
  • correctedFewsats: described as a hosted, custodial platform with an MCP server rather than a self-run node stack; marked inactive (no release in over 12 months). Score 8.2 → 7.1. View entry
  • correctedx402-mcp (Vercel): package name corrected to x402-mcp; an example that did not match the package's API was removed; marked inactive. Score 7.5 → 7.8. View entry
  • correctedCrossmint Agent Wallets: custody described as an owner key plus a scoped agent signer; an API example was replaced with the documented install. Score 7.9 → 7.8. View entry
  • changedx402 Protocol: documented the v2 PAYMENT-REQUIRED / PAYMENT-SIGNATURE headers and the @x402/* packages. Score unchanged at 8.6. View entry
  • changedScores and ranks are now computed from the six criteria rather than authored; every entry lists its sources, last-verified date and a maturity label.
  • addedMCP tools decode_402_challenge, recommend_payment_rail, get_solution, get_scheme_reference and probe_402_support, plus MCP resources and prompts.
  • addedREST equivalents of every tool, a canonical registry feed with JSON Schema, and the 402mcp npm package for stdio MCP clients.

Registry launched

2026.09.21 · 2026-09-21

402MCP.org launched with five entries scored on six criteria.

  • addedInitial entries: Lightning Labs Wavelength, x402 Protocol, Fewsats, Crossmint Agent Wallets, and Vercel's x402-mcp.