The Model Context Protocol seller face for x402 — wrap an MCP tool handler so its call is gated by a settled payment, with the payment and the receipt riding MCP's own _meta extension point. A library mount in the seller's own process; no SDK dependency,
Listed on its own since 2026-09-27. Until then it was part of integraledger-lcp-mcp-server, where its earlier checks remain.
Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.
Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"integraledger-seller-mcp","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
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