{"dataset_version":"2026.10.15","updated":"2026-10-15","entries":[{"version":"2026.10.15","date":"2026-10-15","title":"Nine new entries, sourced corrections, and agent tools","summary":"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.","changes":[{"type":"added","text":"Machine Payments Protocol (MPP), the 'Payment' HTTP authentication scheme from Tempo and Stripe.","solution_id":"machine-payments-protocol"},{"type":"added","text":"Stripe Machine Payments (MPP and x402).","solution_id":"stripe-machine-payments"},{"type":"added","text":"Aperture, the reference L402 reverse proxy.","solution_id":"lightning-labs-aperture"},{"type":"added","text":"lnget, an L402-aware command-line HTTP client.","solution_id":"lightning-labs-lnget"},{"type":"added","text":"Alby MCP Server.","solution_id":"alby-mcp"},{"type":"added","text":"Cloudflare Agents SDK (x402).","solution_id":"cloudflare-agents-x402"},{"type":"added","text":"thirdweb x402.","solution_id":"thirdweb-x402"},{"type":"added","text":"PayAI Network.","solution_id":"payai-x402-facilitator"},{"type":"added","text":"Coinbase Payments MCP.","solution_id":"coinbase-payments-mcp"},{"type":"corrected","text":"Lightning 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.","solution_id":"lightning-labs-wavelength"},{"type":"corrected","text":"Fewsats: 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.","solution_id":"fewsats-l402"},{"type":"corrected","text":"x402-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.","solution_id":"vercel-402-mcp-middleware"},{"type":"corrected","text":"Crossmint 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.","solution_id":"crossmint-agent-wallets"},{"type":"changed","text":"x402 Protocol: documented the v2 PAYMENT-REQUIRED / PAYMENT-SIGNATURE headers and the @x402/* packages. Score unchanged at 8.6.","solution_id":"x402-protocol"},{"type":"changed","text":"Scores and ranks are now computed from the six criteria rather than authored; every entry lists its sources, last-verified date and a maturity label."},{"type":"added","text":"MCP tools decode_402_challenge, recommend_payment_rail, get_solution, get_scheme_reference and probe_402_support, plus MCP resources and prompts."},{"type":"added","text":"REST equivalents of every tool, a canonical registry feed with JSON Schema, and the 402mcp npm package for stdio MCP clients."}]},{"version":"2026.09.21","date":"2026-09-21","title":"Registry launched","summary":"402MCP.org launched with five entries scored on six criteria.","changes":[{"type":"added","text":"Initial entries: Lightning Labs Wavelength, x402 Protocol, Fewsats, Crossmint Agent Wallets, and Vercel's x402-mcp."}]}]}