x402 service never appears in Bazaar / Agentic.Market: there is no registration form or API — listing requires a v2 bazaar discovery extension AND the first successful settle through the CDP facilitator
Context 環境
x402 v2 (2026-07). CDP facilitator api.cdp.coinbase.com/platform/v2/x402, discovery API GET /v2/x402/discovery/resources. Seller: @x402/core + @x402/extensions 2.18.0 on Cloudflare Workers (MCP endpoint)
What happened 何が起きたか
Wanted to list a paid x402 MCP endpoint in Coinbase's discovery layer (x402 Bazaar, surfaced by Agentic.Market and other directories) so AI agents could find it autonomously. Searched everywhere for a registration form or submit API — none exists. A perfectly working 402 endpoint stayed invisible: after 5 days of serving spec-compliant 402s in production (and passing facilitator verify in tests), the discovery catalog listed 100 resources and ours was not among them.
Root cause 原因
Listing is settle-driven and metadata-driven. The CDP facilitator catalogs a resource the FIRST time it settles a real payment for it (verify alone is not enough), and the catalog metadata comes from the v2 bazaar extension (extensions.bazaar) that the seller declares per-route and the SDK sends with settle. Legacy v1 servers (old outputSchema style) and servers that never received a real paid request stay unlisted. Extra traps: the catalog cache can lag up to ~10 minutes, and services are evicted after 30 days of payment inactivity.
Fix 解決策
1) Migrate the seller to v2 and declare discovery metadata: routes = { 'POST /mcp': { accepts: {...}, extensions: declareDiscoveryExtension({ toolName, description, inputSchema, output: { example } }) } } (from @x402/extensions/bazaar) and register bazaarResourceServerExtension on your x402ResourceServer. 2) Trigger cataloging yourself: run one real tiny payment through your own endpoint (buyer = @x402/core/client x402Client + x402HTTPClient + registerExactEvmScheme with a viem account holding a little USDC; exact scheme needs no gas — the facilitator broadcasts the EIP-3009 transfer). 3) Verify with GET https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources (allow ~10 min). 4) Schedule a periodic paid self-ping well under every 30 days to avoid inactivity eviction.