{ "protocolVersion": "1.0", "name": "Agent Economy Index", "description": "Independent daily measurement of the machine-customer economy since 2026-09-29: x402 Bazaar size, sellers, calls, payers, prices, concentration and churn; MCP registry size and growth; every remote MCP server in the registry probed daily for tool drift and flagged descriptions, with claimable server pages. Skills are plain HTTP GET endpoints documented in llms.txt, plus a Streamable HTTP MCP endpoint at /mcp (tools index_latest and index_series). There is no A2A JSON-RPC endpoint. Free: summary, series, census, per-server data, CSV dumps, RSS, MCP. Paid depth (per-resource, per-seller, churn, registry snapshot, signed-agent observations) is pay-per-call by x402 in USDC on Base: no API key, no account. Data license CC BY 4.0.", "url": "https://index.agentexchange.work", "supportedInterfaces": [ { "url": "https://index.agentexchange.work", "protocolBinding": "https://network.agentexchange.work/bindings/plain-http/v1", "protocolVersion": "1.0" } ], "provider": { "organization": "Agent Exchange", "url": "https://agentexchange.work" }, "version": "2026.09.30", "documentationUrl": "https://index.agentexchange.work/llms.txt", "iconUrl": "https://index.agentexchange.work/favicon.svg", "capabilities": { "streaming": false, "pushNotifications": false, "stateTransitionHistory": false, "extendedAgentCard": false, "extensions": [ { "uri": "https://www.x402.org/", "description": "Paid skills use the x402 payment protocol: the route answers HTTP 402 with payment requirements (USDC on Base, eip155:8453); pay with any x402 client and retry. Free skills need nothing. Manifest: https://index.agentexchange.work/.well-known/x402", "required": false, "params": { "manifest": "https://index.agentexchange.work/.well-known/x402", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "x402Version": 1 } } ] }, "securitySchemes": { "x402": { "type": "http", "scheme": "x402", "description": "Not an Authorization-header scheme and not OAuth: paid routes answer HTTP 402 with x402 payment requirements (USDC on Base); the client pays and retries with the x402 payment header. Applies only to the skills that list it; every other skill needs no credentials." } }, "securityRequirements": [], "security": [], "defaultInputModes": [ "application/json" ], "defaultOutputModes": [ "application/json", "text/csv", "application/rss+xml", "text/html" ], "skills": [ { "id": "index-latest", "name": "Latest daily snapshot", "description": "The latest frozen daily snapshot: x402 Bazaar size, sellers, 30-day calls and payers, concentration, category demand, churn; MCP registry size and growth; MCP integrity counts. HTTP 202 while the first snapshot is in progress.", "tags": [ "x402", "bazaar", "mcp-registry", "measurement", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/latest.json" ], "securityRequirements": [] }, { "id": "index-series", "name": "Daily time series", "description": "Daily series for one metric key (?key=bazaar.resources&days=90), or every metric when key is omitted (?days=90).", "tags": [ "time-series", "measurement", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/series.json?key=bazaar.resources&days=90", "GET https://index.agentexchange.work/v1/series.json" ], "securityRequirements": [] }, { "id": "index-snapshot", "name": "One day's snapshot", "description": "The frozen snapshot for one day (YYYY-MM-DD, from 2026-09-29).", "tags": [ "measurement", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/snapshots/2026-09-29.json" ], "securityRequirements": [] }, { "id": "mcp-census", "name": "MCP remote census totals", "description": "Today's census of every remote server in the MCP registry: probed, answered tools/list, tools fingerprinted, auth required, answering 402, dead or failing, not MCP, servers with flagged descriptions. HTTP 202 until the day's census has started.", "tags": [ "mcp", "census", "integrity", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/census.json" ], "securityRequirements": [] }, { "id": "mcp-server", "name": "One MCP server: probes, tools, drift, claim", "description": "Per-server JSON (daily probes, tool fingerprints with flags, drift events, claim state) by exact registry name. HTML page at /mcp-server/, daily-refreshed SVG badge at /badge/mcp/.svg, RSS of its tool changes at /mcp-server//changes.xml. 404 when the name was never probed.", "tags": [ "mcp", "integrity", "badge", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/mcp/.json", "GET https://index.agentexchange.work/badge/mcp/.svg" ], "securityRequirements": [] }, { "id": "mcp-claim", "name": "Claim an MCP server for webhook alerts", "description": "Operators prove control of a probed server by serving its registry name as the body of https:///.well-known/agentexchange-claim.txt, then POST name (plus optional webhook URL and contact) to /v1/mcp/claim as a form or JSON. Claimed servers get one JSON webhook per tool change or new flags (max one per 6 h) and a CLAIMED badge prefix. Public claims list (names, hosts, dates) at /v1/claims.json.", "tags": [ "mcp", "claims", "webhook", "free" ], "examples": [ "POST https://index.agentexchange.work/v1/mcp/claim", "GET https://index.agentexchange.work/v1/claims.json" ], "inputModes": [ "application/x-www-form-urlencoded", "application/json" ], "securityRequirements": [] }, { "id": "bazaar-hosts", "name": "x402 Bazaar sellers by host", "description": "Latest day's per-host table (resources, 30-day calls, payers, sellers, median price, rank) and one seller's JSON or HTML page (/seller/).", "tags": [ "x402", "bazaar", "sellers", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/hosts.json", "GET https://index.agentexchange.work/v1/seller/.json" ], "securityRequirements": [] }, { "id": "dumps", "name": "CSV dumps (CC BY 4.0)", "description": "Latest daily census of registry servers and every flagged tool description, as CSV.", "tags": [ "csv", "open-data", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/dump/servers.csv", "GET https://index.agentexchange.work/v1/dump/flags.csv" ], "outputModes": [ "text/csv" ], "securityRequirements": [] }, { "id": "changes-rss", "name": "RSS of MCP tool changes", "description": "Added, removed and mutated tools detected by the daily probes, newest first.", "tags": [ "rss", "mcp", "free" ], "examples": [ "GET https://index.agentexchange.work/changes.xml" ], "outputModes": [ "application/rss+xml" ], "securityRequirements": [] }, { "id": "conversion", "name": "Our own conversion counter", "description": "Public daily count of x402 payment challenges issued, calls paid and dollars across Agent Exchange hosts (?day=YYYY-MM-DD).", "tags": [ "x402", "transparency", "free" ], "examples": [ "GET https://index.agentexchange.work/v1/conversion.json" ], "securityRequirements": [] }, { "id": "mcp-tools", "name": "MCP tools index_latest and index_series", "description": "The snapshot and the series as MCP tools over Streamable HTTP: JSON-RPC 2.0 by POST, protocol 2025-06-18, no authentication.", "tags": [ "mcp", "streamable-http", "free" ], "examples": [ "POST https://index.agentexchange.work/mcp {\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/list\"}" ], "securityRequirements": [] }, { "id": "paid-v1-pro-resources", "name": "/v1/pro/resources.json (x402, $0.10 per call)", "description": "Every paid x402 resource on a given day with host, seller wallet, price, 30-day calls and unique payers, and capability category. 1,000 rows per page (?day=&category=&page=). Paid route: an unpaid GET answers HTTP 402 with x402 payment requirements; pay $0.10 in USDC on Base (eip155:8453) and retry with the payment header. No API key, no account.", "tags": [ "paid", "x402", "usdc", "base" ], "examples": [ "GET https://index.agentexchange.work/v1/pro/resources.json" ], "securityRequirements": [ { "x402": [] } ] }, { "id": "paid-v1-pro-sellers", "name": "/v1/pro/sellers.json (x402, $0.10 per call)", "description": "Per-seller table for a day: host, wallet, resources, 30-day calls, payers, median price; the retention view of the agent economy (?day=). Paid route: an unpaid GET answers HTTP 402 with x402 payment requirements; pay $0.10 in USDC on Base (eip155:8453) and retry with the payment header. No API key, no account.", "tags": [ "paid", "x402", "usdc", "base" ], "examples": [ "GET https://index.agentexchange.work/v1/pro/sellers.json" ], "securityRequirements": [ { "x402": [] } ] }, { "id": "paid-v1-pro-new", "name": "/v1/pro/new.json (x402, $0.05 per call)", "description": "Resources and seller wallets that appeared or disappeared between the last two snapshots, with categories and prices. Paid route: an unpaid GET answers HTTP 402 with x402 payment requirements; pay $0.05 in USDC on Base (eip155:8453) and retry with the payment header. No API key, no account.", "tags": [ "paid", "x402", "usdc", "base" ], "examples": [ "GET https://index.agentexchange.work/v1/pro/new.json" ], "securityRequirements": [ { "x402": [] } ] }, { "id": "paid-v1-pro-registry", "name": "/v1/pro/registry.json (x402, $0.05 per call)", "description": "Full MCP registry snapshot for a day: every server name and its remote endpoint URL (?day=&page=). Paid route: an unpaid GET answers HTTP 402 with x402 payment requirements; pay $0.05 in USDC on Base (eip155:8453) and retry with the payment header. No API key, no account.", "tags": [ "paid", "x402", "usdc", "base" ], "examples": [ "GET https://index.agentexchange.work/v1/pro/registry.json" ], "securityRequirements": [ { "x402": [] } ] }, { "id": "paid-v1-pro-observations", "name": "/v1/pro/observations.json (x402, $0.05 per call)", "description": "Signed-agent observations at our edge for a day: user-agent family, Web Bot Auth key ids, Cloudflare verified-bot category, ASN, country, path class, counts (?day=). Paid route: an unpaid GET answers HTTP 402 with x402 payment requirements; pay $0.05 in USDC on Base (eip155:8453) and retry with the payment header. No API key, no account.", "tags": [ "paid", "x402", "usdc", "base" ], "examples": [ "GET https://index.agentexchange.work/v1/pro/observations.json" ], "securityRequirements": [ { "x402": [] } ] } ], "supportsExtendedAgentCard": false, "x-agentexchange": { "binding_note": "Plain HTTP, not an A2A task endpoint: each skill is an HTTP endpoint documented in llms.txt. Binding description: https://network.agentexchange.work/bindings/plain-http/v1", "http_api": "https://index.agentexchange.work", "llms_txt": "https://index.agentexchange.work/llms.txt", "openapi": null, "sitemap": "https://index.agentexchange.work/sitemap.xml", "mcp": { "url": "https://index.agentexchange.work/mcp", "transport": "streamable-http", "protocolVersion": "2025-06-18", "tools": [ "index_latest", "index_series" ] }, "x402_manifest": "https://index.agentexchange.work/.well-known/x402", "a2a_health": "https://index.agentexchange.work/a2a/health", "oauth_protected_resource": "https://index.agentexchange.work/.well-known/oauth-protected-resource", "security_txt": "https://index.agentexchange.work/.well-known/security.txt", "contact": "https://index.agentexchange.work/contact", "network_map": "https://network.agentexchange.work/.well-known/agentexchange-network.json", "related": [ { "name": "MCP Registry Integrity Report", "url": "https://drift.agentexchange.work", "what": "tool drift and prompt-injection findings across the public MCP registry, free" }, { "name": "ToolDrift", "url": "https://tooldrift.agentexchange.work", "what": "paid alerts within six hours when an MCP server you depend on changes a tool or trips a detector" }, { "name": "Agent Exchange network", "url": "https://network.agentexchange.work", "what": "every property we operate, one map" } ], "generated": "2026-09-30" } }