{"schema_version":"1.0","asOf":"2026-08-20T10:28:46.582Z","attribution":{"name":"AgentIndex","url":"https://agents.traderszone.net","methodology":"https://agents.traderszone.net/crawler-policy","license":"CC-BY-4.0","cite":"AgentIndex data.json, https://agents.traderszone.net/data.json"},"caveats":["Protocol detection (MCP/A2A/x402/ARD) is independently measured via live handshake, not self-reported.","mcpLiveness.confirmed = endpoints that answered a real JSON-RPC initialize request this crawl cycle.","paymentVerified = endpoints with on-chain USDC ERC-20 transfer evidence to their payTo address (Base).","x402.detected includes Bazaar-listed domains; x402.paymentVerified is the independently-confirmed subset.","resources includes stub directory entries (type=null); typed resources are the higher-quality subset.","Data is updated once daily via automated crawl (03:30 UTC). asOf reflects the latest stats query time."],"index":{"totalResources":172568,"totalEndpoints":12960,"ardDomainsReached":118,"ardDomainsChecked":1535,"strictValidArdCatalogs":24,"selfDeclaredManifests":42,"source":"measured"},"protocols":{"mcp":{"detected":4124,"source":"measured","method":"JSON-RPC initialize handshake"},"a2a":{"detected":396,"source":"measured","method":"agent-card fetch + skills[] parse"},"x402":{"detected":900,"source":"measured","method":"402 response with spec-valid accepts[]"},"ard":{"detected":15,"source":"measured","method":"valid ARD catalog at /.well-known/ai-catalog.json"},"mpp":{"detected":129,"source":"measured","method":"402 response with WWW-Authenticate: Payment challenge (IETF draft-ryan-httpauth-payment)"},"ucp":{"detected":13,"source":"measured","method":"/.well-known/ucp JSON probe"},"olas":{"detected":5,"source":"measured","method":"Olas AgentRegistry ERC-721 enumeration on Ethereum mainnet"},"erc8004":{"detected":1008,"source":"measured","method":"ERC-8004 IdentityRegistry ERC-721 enumeration on Base mainnet (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432)"},"virtuals":{"detected":371,"source":"registry","method":"Virtuals ACP registry API (acpx.virtuals.io); ACP settlement contract 0x6a1FE26D54ab0d3E1e3168f2e0c0cDa5cC0A0A4A verified deployed on Base, but the agent list is publisher-reported, not chain-enumerated"},"masumi":{"detected":181,"source":"registry","method":"Masumi network agent registry (preprod + mainnet, api_base_url enumeration)"}},"mcpLiveness":{"registryDeclared":8935,"confirmedLive":3712,"notMcp":3357,"unreachable":633,"robotsBlocked":1232,"toolsEnriched":3981,"liveRate":41.5,"source":"measured","note":"liveRate = confirmedLive / registryDeclared; many registry entries are package metadata, not hosted servers."},"quality":{"paymentVerified":1540,"paymentVerifiedMethod":"eth_getLogs ERC-20 Transfer on Base USDC contract","a2aCardsStored":414,"openapiSpecsStored":118,"source":"measured"},"onchainScan":{"ts":"2026-08-20T04:07:20.302Z","coverage":"complete","blocksCovered":300001,"blocksTarget":300001,"gaps":0,"gapBlocks":0,"deadlineHit":false},"resourcesByType":[{"type":null,"c":36753},{"type":"acp-agent","c":44051},{"type":"application/a2a-agent-card+json","c":8},{"type":"application/agent-skills+md","c":5},{"type":"application/ai-catalog+json","c":13},{"type":"application/ai-registry+json","c":3},{"type":"application/ai-skill","c":793},{"type":"application/ai-skill+md","c":21},{"type":"application/json","c":7},{"type":"application/mcp","c":1},{"type":"application/mcp-server+json","c":19802},{"type":"application/mcp-server-card+json","c":209},{"type":"application/mpp-server+json","c":152},{"type":"application/octet-stream","c":2},{"type":"application/okf-bundle+gzip","c":2},{"type":"application/openapi+json","c":118},{"type":"application/openapi+json;version=3.1","c":1},{"type":"application/opencode-subagent+json","c":15},{"type":"application/vnd.oai.openapi+json","c":6},{"type":"application/vnd.oai.openapi+json;version=3.1","c":1},{"type":"application/x402-resource+json","c":25696},{"type":"application/xml","c":1},{"type":"erc8004-agent","c":42515},{"type":"masumi-agent","c":2246},{"type":"olas-agent","c":116},{"type":"text/html","c":7},{"type":"text/markdown","c":19},{"type":"text/markdown; profile=\"urn:air:agent-skills\"","c":2},{"type":"text/plain","c":3}],"api":{"freeEndpoints":["/browse","/endpoints","/stats","/data.json","/.well-known/ai-catalog.json"],"paidEndpoints":{"search":{"path":"/search","price":"$0.005 USDC","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0"},"agentProfile":{"path":"/agent/:id","price":"$0.01 USDC","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0","idNote":":id accepts integer resource id OR full identifier URN from /search results (e.g. urn:air:example.com:name)"},"liveness":{"path":"/agent/:id/liveness","price":"$0.02 USDC","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0","idNote":"same :id as agentProfile"},"score":{"path":"/agent/:id/score","price":"$0.10 USDC","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0","idNote":"same :id as agentProfile"},"publisherVerify":{"path":"POST /verify","price":"$5 USDC","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0"},"bulkExport":{"path":"GET /bulk","price":"$1 USDC/1k records","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0"},"alerts":{"path":"GET /alerts","price":"$0.10 USDC","network":"base","payTo":"0x31b178B0130aC1430DB11B748F07E581636FBBc0"}},"mcpWrapper":"POST https://agents.traderszone.net/mcp (Model Context Protocol, free tier)","note":"Paid routes use x402 (HTTP 402 + USDC EIP-3009 transferWithAuthorization). No accounts needed."}}