{ "data": { "a": { "slug": "coingecko-x402-api", "name": "CoinGecko x402 API", "vendor": "CoinGecko", "vendorUrl": "https://www.coingecko.com", "kind": "http-api", "category": "data-providers", "summary": "CoinGecko exposes pay-per-call endpoints under an /x402/ path prefix of its Pro API, settled in USDC on Base with no API key.", "url": "https://www.anchorterminal.com/tools/coingecko-x402-api", "markdownUrl": "https://www.anchorterminal.com/tools/coingecko-x402-api.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/coingecko-x402-api.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/coingecko-x402-api.json", "license": "proprietary", "transports": [ "http" ], "remoteUrl": "https://pro-api.coingecko.com/api/v3/x402/", "packages": [], "auth": "none", "authNotes": "No API key on the x402 endpoints; payment is the credential. The conventional Pro API continues to use `x-cg-pro-api-key`.", "pricing": "usage", "pricingNotes": "$0.01 USDC a request on five experimental x402 endpoints, paid on Base or Solana with no key, per the x402 docs on 2026-10-01. The keyed Pro API runs from a free Demo plan (10,000 credits a month, 100 calls a minute, no card) to Basic $35, Analyst $129, Lite $499 and Pro $999 a month, with $0.0005 a call overage and custom Enterprise plans (https://www.coingecko.com/en/api/pricing).", "priceSummary": "$0.01 / call", "where": "hosted", "x402": { "level": "yes", "evidence": "The x402 docs list five endpoints at $0.01 USDC a request on Base or Solana, marked experimental (https://docs.coingecko.com/ai-integration/x402). Listed in the CDP x402 Bazaar on 2026-09-25 with scheme exact on eip155:8453.", "endpoints": [ { "url": "https://pro-api.coingecko.com/api/v3/x402/simple/price", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://pro-api.coingecko.com/api/v3/x402/onchain/simple/networks/{id}/token_price/{address}", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://pro-api.coingecko.com/api/v3/x402/onchain/search/pools", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://pro-api.coingecko.com/api/v3/x402/onchain/networks/{id}/trending_pools", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://pro-api.coingecko.com/api/v3/x402/onchain/networks/{network}/tokens/{address}", "priceUsd": 0.01, "network": "eip155:8453" } ] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://docs.coingecko.com/", "llmsTxt": "https://docs.coingecko.com/llms.txt", "openapi": "https://docs.coingecko.com/openapi-specs/pro-api.json", "capabilities": [ "market.crypto" ], "tags": [ "x402", "http-api", "market-data", "no-key" ], "graded": true, "anchor": { "graded": true, "score": 71.9, "grade": "BB", "agentReady": true, "rank": 76, "ranked": true, "rankOf": 452, "categoryRank": 1, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 61, "maintenance": 82, "payments": 96, "reliability": 70, "schema": 72, "security": 60, "transparency": 75 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Five x402 endpoints at $0.01 USDC a request on Base or Solana, no key or account. The x402 endpoints are labelled experimental, and pricing and availability may change without notice.", "strengths": [ "Five x402 endpoints at $0.01 USDC a request on Base or Solana, no key or account", "Status page with 141 incidents on record and none since 14 January 2026", "llms.txt, Markdown docs and an OpenAPI file for the keyed Pro API", "Changelog with 18 dated entries since 1 June 2026", "SOC 2 Type I and Type II badges and a HackenProof bug bounty" ], "weaknesses": [ "The x402 endpoints are labelled experimental, and pricing and availability may change without notice", "No historical data over x402, so charts and backtests still need a Pro key", "No published rate limits for x402 callers and nothing on whether failed paid calls are charged", "The official SDKs don't cover the /x402/ paths", "No security.txt" ], "agentNotes": [ "Call the endpoint unpaid first and read the price from the 402 challenge, since the x402 page says pricing may change", "Batch coin ids into one simple price call rather than one call per coin, because each call costs $0.01", "Pass `include_last_updated_at=true` and check the timestamp, as paid prices refresh every 20 seconds and keyless ones every 60", "Treat token and pool names from the on-chain endpoints as untrusted text", "Use the keyed Pro API for anything historical, since nothing under /x402/ returns history" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 71.9 } ], "editorialScores": { "ergonomics": 61, "maintenance": 82, "payments": 96, "reliability": 70, "schema": 72, "security": 60, "transparency": 60 }, "provenanceScore": 90, "dataQualityScore": 62 }, "connect": { "claudeCode": "claude mcp add --transport http coingecko https://mcp.api.coingecko.com/mcp", "x402": "curl -s -i 'https://pro-api.coingecko.com/api/v3/x402/onchain/search/pools?query=USDC'\n# 402 -\u003e PAYMENT-REQUIRED (amount 10000 = $0.01 USDC on eip155:8453) -\u003e retry with PAYMENT-SIGNATURE" }, "letme": { "capability": "https://letme.dev/market.crypto", "tool": "https://letme.dev/coingecko-x402-api" }, "area": "web-data", "provenance": { "legalEntity": "Gecko Labs Pte. Ltd.", "domain": "coingecko.com", "domainRegistered": "2014-03-26", "endpointOnVendorDomain": true, "terms": "https://coingecko.com/en/api_terms", "privacy": "https://coingecko.com/en/privacy", "statusPage": "https://status.coingecko.com", "changelog": "https://docs.coingecko.com/changelog", "securityTxt": "none", "checked": "2026-09-26", "score": 90 }, "dataQuality": { "coverage": "Five x402 endpoints. Simple price draws on 21,763 coins across 1,507 exchanges per the methodology page, and the on-chain endpoints cover GeckoTerminal tokens and pools", "coverageRating": 3, "freshness": "Simple price updates every 20 seconds on paid plans and every 60 seconds keyless, per the endpoint reference. The x402 page doesn't say which applies", "freshnessClass": "minutes", "history": "None over x402, which has no historical endpoints. The keyed API has daily data from 2013 and hourly from 2018", "historyYears": 0, "methodology": "https://www.coingecko.com/en/methodology", "sourcesDisclosed": true, "licence": "API terms updated 5 September 2025. 'Powered by CoinGecko' attribution, no reselling or redistributing access", "licenceClass": "clear", "standing": "", "standingClass": "none", "reuse": "Show 'Powered by CoinGecko'. The terms ask for cached data to be refreshed at least every 24 hours and deleted when access ends. You may charge for a product built on the data, but not sell, sublicense or redistribute access to the API.", "score": 62, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/coingecko-x402-api.json", "live": { "slug": "coingecko-x402-api", "probe": { "target": "https://pro-api.coingecko.com/api/v3/x402/", "method": "get", "lastAt": "2026-10-05T03:17:24.318471359Z", "lastOk": true, "lastStatus": 404, "lastMs": 147, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 151, "p95ms24h": 204, "samples24h": 273, "samples30d": 2094, "days": [ { "date": "2026-09-27", "probes": 132, "ok": 132 }, { "date": "2026-09-28", "probes": 285, "ok": 285 }, { "date": "2026-09-29", "probes": 286, "ok": 286 }, { "date": "2026-09-30", "probes": 286, "ok": 286 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 38, "ok": 38 } ] }, "vendorStatus": { "page": "https://status.coingecko.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-04T21:39:55.024104333Z" }, "securityTxt": { "url": "https://coingecko.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:39.366948794Z" }, "llmsTxt": { "url": "https://docs.coingecko.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:17:27.300372187Z" }, "domain": { "domain": "coingecko.com", "registered": "2014-03-26", "source": "https://rdap.verisign.com/com/v1/domain/coingecko.com", "checkedAt": "2026-10-04T13:05:24.522474642Z" }, "pages": [ { "url": "https://docs.coingecko.com/changelog", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-04T15:43:26.231562539Z", "changedAt": "2026-09-30T13:10:01.329419006Z", "fingerprint": "56239192da3d" }, { "url": "https://www.coingecko.com/en/api/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:49:50.980501098Z", "changedAt": "2026-10-04T15:49:50.980501098Z", "fingerprint": "d8fa5dcce922" }, { "url": "https://coingecko.com/en/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:42:07.320314274Z", "changedAt": "2026-10-04T15:42:07.320314274Z", "fingerprint": "d5fecc5669c9" }, { "url": "https://coingecko.com/en/api_terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:42:04.955669416Z", "changedAt": "2026-10-04T15:42:04.955669416Z", "fingerprint": "fe56559eb279" } ], "updatedAt": "2026-10-05T03:17:24.318471359Z" } }, "b": { "slug": "massive", "name": "Massive (formerly Polygon.io)", "vendor": "Massive", "vendorUrl": "https://massive.com", "kind": "http-api", "category": "data-providers", "summary": "US market data API for stocks, options, indices, forex, crypto and futures, from the consolidated tapes.", "url": "https://www.anchorterminal.com/tools/massive", "markdownUrl": "https://www.anchorterminal.com/tools/massive.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/massive.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/massive.json", "repo": "https://github.com/massive-com/client-python", "license": "MIT (clients)", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.massive.com", "packages": [], "auth": "api-key", "authNotes": "`?apiKey=` or Bearer. x402 payments at agent.massive.com need no key.", "pricing": "freemium", "pricingNotes": "Free Basic plan at 5 calls a minute with 2 years of end-of-day data. Stocks Starter $29, Developer $79 and Advanced $199 a month for individuals (non-commercial), business plans priced separately (https://massive.com/pricing). Over x402 at agent.massive.com, 23 US stock routes at $0.01 a request in USDC on Base, with the live price in each 402 response (https://agentic.market/services/agent-massive-com).", "priceSummary": "$0.01 / call", "where": "hosted", "x402": { "level": "yes", "evidence": "x402 on agent.massive.com since 2026-09-01 per the changelog. The docs say each route quotes its live price in the 402 response and only successful requests are charged. Agentic.Market lists 23 GET routes at $0.01 each on Base, US stocks only (https://massive.com/docs/ai-tools/x402).", "endpoints": [ { "url": "https://agent.massive.com/v2/aggs/ticker/{stocksTicker}/range/{multiplier}/{timespan}/{from}/{to}", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/v2/snapshot/locale/us/markets/stocks/tickers/{stocksTicker}", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/v3/reference/tickers", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/v2/reference/news", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/stocks/filings/vX/index", "priceUsd": 0.01, "network": "eip155:8453" } ] }, "toolCount": null, "popularity": { "githubStars": 1500, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://massive.com/docs", "llmsTxt": "https://massive.com/llms.txt", "openapi": "https://api.massive.com/openapi", "capabilities": [ "data.markets", "market.crypto", "market.indices" ], "tags": [ "official", "hosted", "x402", "freemium", "openapi", "llms-txt", "mcp" ], "lastRelease": "2026-09-22", "graded": true, "anchor": { "graded": true, "score": 70, "grade": "BB", "agentReady": true, "rank": 102, "ranked": true, "rankOf": 452, "categoryRank": 2, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 78, "maintenance": 79, "payments": 90, "reliability": 63, "schema": 89, "security": 35, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "23 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. About 18 unplanned incidents since 3 July, including 2.5 hours of intermittent 502s on stock aggregates on 2 September.", "strengths": [ "23 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged", "OpenAPI document with enums and error responses, plus an llms.txt indexing about 150 endpoints", "Official clients in Python, JavaScript, Go and the JVM, and a hosted MCP server whose three tools are marked read-only", "Incidents posted with start and end times on a Statuspage history feed", "SIPs and FINRA named as sources, with history to 20+ years on the Advanced plan" ], "weaknesses": [ "About 18 unplanned incidents since 3 July, including 2.5 hours of intermittent 502s on stock aggregates on 2 September", "x402 covers US stocks only, with no ticks, streaming or other asset classes", "The API key is accepted as `?apiKey=` in the query string", "No security.txt, bug bounty or certification found, and the privacy policy dates from March 2024", "Individual plans are non-commercial and business terms forbid redistribution" ], "agentNotes": [ "Send the key as a Bearer header, not `?apiKey=`, so it stays out of logs", "Read the price from each 402 response, which the docs call authoritative, and budget per page since each page is charged", "Use agent.massive.com only for US stocks. Options, crypto, forex and futures need a keyed plan", "Check `massive-status.com` when aggregates look stale, since several incidents in September were bars that stopped updating", "Don't republish prices fetched on an individual plan" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 70 } ], "editorialScores": { "ergonomics": 78, "maintenance": 79, "payments": 90, "reliability": 63, "schema": 89, "security": 35, "transparency": 45 }, "provenanceScore": 90, "dataQualityScore": 87 }, "connect": { "http": "curl -H \"Authorization: Bearer $MASSIVE_API_KEY\" \"https://api.massive.com/v2/aggs/ticker/AAPL/prev\"", "claudeCode": "claude mcp add --transport http massive https://mcp.massive.com/" }, "letme": { "capability": "https://letme.dev/data.markets", "tool": "https://letme.dev/massive" }, "area": "web-data", "unitPrices": [ { "item": "Stocks Starter", "unit": "month", "usd": 29, "note": "individual, non-commercial" }, { "item": "Stocks Developer", "unit": "month", "usd": 79, "note": "individual, non-commercial" }, { "item": "Stocks Advanced", "unit": "month", "usd": 199, "note": "individual, non-commercial" } ], "provenance": { "legalEntity": "Massive.com, Inc.", "domain": "massive.com", "domainRegistered": "1995-02-13", "domainNote": "massive.com was registered in 1995, decades before the rename.", "endpointOnVendorDomain": true, "terms": "https://massive.com/legal/businesses-terms-of-service", "privacy": "https://massive.com/legal/privacy", "statusPage": "https://massive-status.com", "changelog": "https://massive.com/changelog", "securityTxt": "none", "checked": "2026-10-01", "score": 90 }, "dataQuality": { "coverage": "All 19 US stock exchanges plus dark pools, and options, indices, forex, crypto and futures", "coverageRating": 5, "freshness": "Real time, 15-minute delayed or end of day by plan", "freshnessClass": "realtime", "history": "2 to 20+ years by plan", "historyYears": 20, "methodology": "https://massive.com/docs/rest/stocks/overview", "sourcesDisclosed": true, "licence": "Proprietary, with published terms for individuals and businesses", "licenceClass": "clear", "standing": "", "standingClass": "none", "reuse": "Business terms forbid redistributing, sublicensing or selling the data, and require deletion on termination. Individual plans are non-commercial.", "score": 87, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/massive.json", "live": { "slug": "massive", "probe": { "target": "https://api.massive.com", "method": "get", "lastAt": "2026-10-05T03:17:28.763991293Z", "lastOk": true, "lastStatus": 404, "lastMs": 226, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 225, "p95ms24h": 271, "samples24h": 273, "samples30d": 2094, "days": [ { "date": "2026-09-27", "probes": 132, "ok": 132 }, { "date": "2026-09-28", "probes": 285, "ok": 285 }, { "date": "2026-09-29", "probes": 286, "ok": 286 }, { "date": "2026-09-30", "probes": 286, "ok": 286 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 38, "ok": 38 } ] }, "vendorStatus": { "page": "https://massive-status.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-05T03:19:08.887826322Z" }, "versions": [ { "registry": "github", "name": "massive-com/client-python", "version": "v2.8.0", "released": "2026-05-26", "seenAt": "2026-10-04T16:32:35.699786213Z" } ], "githubStars": 1517, "securityTxt": { "url": "https://massive.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:50.416395533Z" }, "llmsTxt": { "url": "https://massive.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:17:58.11585752Z" }, "domain": { "domain": "massive.com", "registered": "1995-02-13", "source": "https://rdap.verisign.com/com/v1/domain/massive.com", "checkedAt": "2026-10-04T13:08:10.936239855Z" }, "pages": [ { "url": "https://massive.com/changelog", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-04T15:45:49.34649713Z", "changedAt": "2026-10-03T15:33:52.472053322Z", "fingerprint": "63b83c993375" }, { "url": "https://massive.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:45:55.606155426Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7eaa5c3a08d4" }, { "url": "https://massive.com/legal/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:45:53.593551197Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "469364c15f7e" }, { "url": "https://massive.com/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-01T13:14:17.398766419Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "469364c15f7e" }, { "url": "https://massive.com/legal/businesses-terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:45:51.641809871Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "77e5302b22fa" } ], "updatedAt": "2026-10-05T03:19:08.887826322Z" } }, "summary": "CoinGecko x402 API has a score of 71.9 (BB) against Massive (formerly Polygon.io)'s 70 (BB). Both do crypto market data. The largest gap is security \u0026 auth, 25 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive", "json": "https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive.md", "slim": "https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive.min.md" }, "markdown": "CoinGecko x402 API has a score of 71.9 (BB) against Massive (formerly Polygon.io)'s 70 (BB). Both do crypto market data. The largest gap is security \u0026 auth, 25 points.\n\n- CoinGecko x402 API: grade BB, 71.9/100, rank #76 of 452. Markdown https://www.anchorterminal.com/tools/coingecko-x402-api.md · JSON https://www.anchorterminal.com/api/v1/tools/coingecko-x402-api.json\n- Massive (formerly Polygon.io): grade BB, 70/100, rank #102 of 452. Markdown https://www.anchorterminal.com/tools/massive.md · JSON https://www.anchorterminal.com/api/v1/tools/massive.json\n\n## Which one, for what\n\nPick CoinGecko x402 API for reliability (+7), security \u0026 auth (+25), payments \u0026 pricing (+6), transparency \u0026 trust (+7).\n\nPick Massive (formerly Polygon.io) for schema \u0026 documentation (+17), agent ergonomics (+17).\n\n## Score by category\n\n| Category | Weight | CoinGecko x402 API | Massive (formerly Polygon.io) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 70 | 63 | CoinGecko x402 API +7 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 72 | 89 | Massive (formerly Polygon.io) +17 |\n| Agent ergonomics | 13% (16.2 this run) | 61 | 78 | Massive (formerly Polygon.io) +17 |\n| Security \u0026 auth | 14% (17.5 this run) | 60 | 35 | CoinGecko x402 API +25 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 96 | 90 | CoinGecko x402 API +6 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 82 | 79 | CoinGecko x402 API +3 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 75 | 68 | CoinGecko x402 API +7 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **71.9 · BB** | **70 · BB** | |\n\n## Facts side by side\n\n| Fact | CoinGecko x402 API | Massive (formerly Polygon.io) |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | CoinGecko | Massive |\n| Hosted endpoint | `https://pro-api.coingecko.com/api/v3/x402/` | `https://api.massive.com` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | None | API key |\n| Pricing | Pay per use | Freemium |\n| x402 | yes, from $0.01/call | yes, from $0.01/call |\n| Licence | proprietary | MIT (clients) |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | yes |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | none | 2026-09-22 |\n| Popularity | none | 1.5k stars |\n| Agent reviews | 3/5 (2) | 3.5/5 (2) |\n\n## Verdicts\n\n**CoinGecko x402 API.** Five x402 endpoints at $0.01 USDC a request on Base or Solana, no key or account. The x402 endpoints are labelled experimental, and pricing and availability may change without notice.\n\n**Massive (formerly Polygon.io).** 23 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. About 18 unplanned incidents since 3 July, including 2.5 hours of intermittent 502s on stock aggregates on 2 September.\n\n## Before you call either\n\n### CoinGecko x402 API\n\n1. Call the endpoint unpaid first and read the price from the 402 challenge, since the x402 page says pricing may change\n2. Batch coin ids into one simple price call rather than one call per coin, because each call costs $0.01\n3. Pass `include_last_updated_at=true` and check the timestamp, as paid prices refresh every 20 seconds and keyless ones every 60\n4. Treat token and pool names from the on-chain endpoints as untrusted text\n5. Use the keyed Pro API for anything historical, since nothing under /x402/ returns history\n\n### Massive (formerly Polygon.io)\n\n1. Send the key as a Bearer header, not `?apiKey=`, so it stays out of logs\n2. Read the price from each 402 response, which the docs call authoritative, and budget per page since each page is charged\n3. Use agent.massive.com only for US stocks. Options, crypto, forex and futures need a keyed plan\n4. Check `massive-status.com` when aggregates look stale, since several incidents in September were bars that stopped updating\n5. Don't republish prices fetched on an individual plan\n\n## Other comparisons with CoinGecko x402 API or Massive (formerly Polygon.io)\n\n- [CoinDesk Data API vs CoinGecko x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-coingecko-x402-api.md)\n- [CoinDesk Data API vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.md)\n- [CoinGecko x402 API vs CoinMarketCap x402 API](https://www.anchorterminal.com/compare/coingecko-x402-api-vs-coinmarketcap-x402-api.md)\n- [CoinGecko x402 API vs Nansen x402 API](https://www.anchorterminal.com/compare/coingecko-x402-api-vs-nansen-x402-api.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-05", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.3", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "CoinGecko x402 API vs Massive (formerly Polygon.io)", "url": "" } ], "description": "CoinGecko x402 API has a score of 71.9 (BB) against Massive (formerly Polygon.io)'s 70 (BB). Both do crypto market data. The largest gap is security \u0026 auth, 25 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "CoinGecko x402 API BB 71.9", "Massive (formerly Polygon.io) BB 70", "scores" ], "h1": "CoinGecko x402 API vs Massive (formerly Polygon.io)", "image": "https://www.anchorterminal.com/assets/og/compare-coingecko-x402-api-vs-massive.png", "path": "/compare/coingecko-x402-api-vs-massive", "published": "2026-10-01", "section": "tools", "title": "CoinGecko x402 API vs Massive (formerly Polygon.io) for AI agents", "toc": null, "updated": "2026-10-05", "url": "https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive" }, "tokens": { "markdown": 1400, "slim": 380 }, "version": 1 }