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The Bazaar is AutoLayer’s off-chain discovery layer for Stellar x402 resources. Sellers attach the standard discovery extension to payment requirements; after successful settlement, the facilitator validates and catalogs the listing without a separate registration step.

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Resource model

HTTP resources are keyed by URL. MCP tools are keyed by resource URL plus input.toolName. Listings retain service name, description, MIME type, tags, x402 version, accepted payment requirements, resource type, validated discovery data and last-update time.

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Integrity boundary

  • Cataloging occurs only after successful settlement.
  • @x402/extensions performs discovery schema extraction.
  • Malformed metadata is soft-dropped rather than failing a valid payment.
  • routeTemplate requires percent-decoding and traversal validation.
  • Catalog outcome and reason are returned through EXTENSION-RESPONSES.
  • The index stays off-chain, avoiding rent and a second per-payment transaction.
GET /discovery/resources provides deterministic filters and offset pagination. GET /discovery/search uses PostgreSQL weighted full-text retrieval, rank, freshness tie-breaking, opaque cursors and partialResults. Search quality should be evaluated with a maintained query/relevance set, zero-result rate, click or paid-call outcome, and regression checks when metadata conventions change.
Successful payment raises the cost of poisoning but does not prove control of a URL. Add DNS/origin ownership verification before unrestricted public catalog registration.