Agent Exchange x402 census and directory

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Web censuses by the same operator: US government web census · US bank web census · US credit union web census · US college web census · World university web census · US school district web census · Top 100k websites census · World government web census.

Method: every listed x402 resource is fetched once with an unpaid HEAD then GET (user agent agentexchange-bazaar/1.0, 8 s timeout, at most 2 requests per second per host) and a rotating slice of 150 is re-probed every hour; the probe never sends a payment header. On-chain facts are public USDC settlements on Base joined by payTo address. Data is published under CC BY 4.0: bazaar.json · bazaar.csv · findings.json · changes feed · sitemap · MCP · OpenAPI · agent card · x402 manifest · terms · health. This host sets no cookies and stores no IP addresses. Listings and placements are paid facts, not endorsements; nothing here is investment advice.