{ "data": { "a": { "slug": "coindesk-data-api", "name": "CoinDesk Data API", "vendor": "CoinDesk Data (formerly CCData / CryptoCompare)", "vendorUrl": "https://developers.coindesk.com", "kind": "http-api", "category": "data-providers", "summary": "Institutional market-data REST and WebSocket API covering spot, futures, options, reference-rate indices (CADLI, CCIX), asset metadata, on-chain data and news across 300+ exchanges, with an official hosted MCP server since May 2026.", "url": "https://www.anchorterminal.com/tools/coindesk-data-api", "markdownUrl": "https://www.anchorterminal.com/tools/coindesk-data-api.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/coindesk-data-api.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/coindesk-data-api.json", "license": "proprietary", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://data-api.coindesk.com", "packages": [], "auth": "api-key", "authNotes": "API key as `Authorization: Apikey \u003ckey\u003e` (preferred) or the `api_key` query parameter, which the docs still accept. Keys are issued per account in the developer portal. The legacy `min-api.cryptocompare.com` surface takes the same keys.", "pricing": "paid", "pricingNotes": "Subscription plans metered in monthly call credits, with ceilings per second, minute, hour, day and month. The pricing page at developers.coindesk.com renders only in a browser, and we couldn't read plan figures on 2026-10-01. data.coindesk.com points new customers to a call with sales for trials. The free tier (100,000 credits a month) was retired on 2026-05-21, so accounts without a subscription get no API access.", "priceSummary": "Paid", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 on data-api.coindesk.com as of the run date. Payment is by subscription.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://developers.coindesk.com/documentation/data-api/introduction", "openapi": "https://data-api.coindesk.com/info/v1/openapi", "capabilities": [ "market.crypto", "market.indices", "market.news" ], "tags": [ "http-api", "market-data", "indices", "websocket", "status-page", "openapi", "mcp", "oauth" ], "graded": true, "disclosure": "Anchor Terminal's founder built this API at CryptoCompare, which became CCData and was acquired by CoinDesk in 2024. He no longer works there. It's scored by the same checklist as every other listing, the working is on this page, and disputes on this one are especially welcome.", "anchor": { "graded": true, "score": 46.9, "grade": "D", "agentReady": false, "rank": 391, "ranked": true, "rankOf": 452, "categoryRank": 6, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 23, "payments": 0, "reliability": 43, "schema": 72, "security": 45, "transparency": 61 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-10-01" }, "negative": 0, "verdict": "Official OpenAPI 3.0.3 document at data-api.coindesk.com/info/v1/openapi, with enums, examples and error responses from 400 to 503. No free or trial access since 2026-05-21, and no x402, so a person has to buy a plan before an agent gets data.", "disclosure": "Anchor Terminal's founder built this API at CryptoCompare, which became CCData and was acquired by CoinDesk in 2024. He no longer works there. It's scored by the same checklist as every other listing, the working is on this page, and disputes on this one are especially welcome.", "strengths": [ "Official OpenAPI 3.0.3 document at data-api.coindesk.com/info/v1/openapi, with enums, examples and error responses from 400 to 503", "Spot, futures, options, CADLI and CCIX indices, on-chain and news from one key, with history to 2010", "Hosted MCP server with 39 tools across spot and index, futures, options, news and on-chain, behind OAuth with PKCE", "18 published index methodologies on the CoinDesk Indices governance page", "ISO 27001 certificate cited and a Bugcrowd bug bounty" ], "weaknesses": [ "No free or trial access since 2026-05-21, and no x402, so a person has to buy a plan before an agent gets data", "Docs portal, llms.txt, pricing page and status page all render only in a browser", "No public changelog since the monthly product updates stopped in July 2025", "The `api_key` query parameter is still accepted, so keys can leak into logs", "No official SDK found" ], "agentNotes": [ "Read the OpenAPI at `https://data-api.coindesk.com/info/v1/openapi` rather than the docs site, which a plain fetch can't render", "Send the key as `Authorization: Apikey \u003ckey\u003e` and never in the query string", "Use `groups` to ask for only the field groups you need on tick endpoints", "Back off on 429 until the window resets, since limits apply per second, minute, hour, day and month", "For reference prices, call the CADLI or CCIX index endpoints rather than one exchange's spot tick" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "D", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 46.9 } ], "editorialScores": { "ergonomics": 70, "maintenance": 23, "payments": 0, "reliability": 43, "schema": 72, "security": 45, "transparency": 42 }, "provenanceScore": 80, "dataQualityScore": 93 }, "connect": { "claudeCode": "claude mcp add --transport http coindesk https://mcp.coindesk.com/mcp", "headless": { "curl": "curl -s 'https://data-api.coindesk.com/index/cc/v1/latest/tick?market=cadli\u0026instruments=BTC-USD,ETH-USD' -H 'Authorization: Apikey $COINDESK_API_KEY'" } }, "letme": { "capability": "https://letme.dev/market.crypto", "tool": "https://letme.dev/coindesk-data-api" }, "area": "web-data", "provenance": { "legalEntity": "CC Data Limited, trading as CoinDesk Data (England and Wales, 10966788)", "domain": "coindesk.com", "domainRegistered": "2008-05-04", "domainNote": "The API licence names CC Data Limited, a CoinDesk company, as the licensor. The endpoint and the terms sit on coindesk.com.", "endpointOnVendorDomain": true, "terms": "https://coindesk.com/terms", "privacy": "https://coindesk.com/privacy", "statusPage": "https://status.coindesk.com", "changelog": "", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "No public changelog. The blog's monthly product updates stopped after July 2025, and the developer portal renders only in a browser.", "security.txt returns 404 on www.coindesk.com. A Bugcrowd bug bounty is linked from the privacy notice." ], "score": 80 }, "dataQuality": { "coverage": "300+ centralised and decentralised exchanges, 300k trading pairs and 10,000+ coins per data.coindesk.com, across spot, futures, options, indices, on-chain and news", "coverageRating": 5, "freshness": "Real-time ticks over WebSocket", "freshnessClass": "realtime", "history": "Back to 2010, per data.coindesk.com", "historyYears": 16, "methodology": "https://indices.coindesk.com/documentation-and-governance", "sourcesDisclosed": true, "licence": "API Licence Agreement, updated 2026-04-22. Internal use only, no display or redistribution without written permission, attribution rules apply", "licenceClass": "clear", "standing": "The CoinDesk Indices governance page links an FCA authorisation and names CC Data Limited as the affiliate that runs outsourced index administration and calculation. It covers the index data (CADLI, CCIX), not exchange-level prices. We didn't load the FCA register entry", "standingClass": "regulated", "reuse": "Internal use only under the API Licence Agreement. No display, redistribution or use in a commercial product or index without written permission, and the data has to be deleted when the licence ends.", "score": 93, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/coindesk-data-api.json", "live": { "slug": "coindesk-data-api", "probe": { "target": "https://data-api.coindesk.com", "method": "get", "lastAt": "2026-10-05T02:29:54.066608419Z", "lastOk": true, "lastStatus": 401, "lastMs": 33, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 34, "p95ms24h": 60, "samples24h": 273, "samples30d": 2085, "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": 29, "ok": 29 } ] }, "vendorStatus": { "page": "https://status.coindesk.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-04T21:39:54.962512289Z" }, "securityTxt": { "url": "https://coindesk.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:38.86908935Z" }, "domain": { "domain": "coindesk.com", "registered": "2008-05-04", "source": "https://rdap.verisign.com/com/v1/domain/coindesk.com", "checkedAt": "2026-10-04T13:05:14.326388515Z" }, "pages": [ { "url": "https://data.coindesk.com/", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-04T15:42:17.469369655Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "6d19f04522ce" }, { "url": "https://coindesk.com/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:42:02.727418281Z", "changedAt": "2026-10-04T15:42:02.727418281Z", "fingerprint": "81c70c70e28a" }, { "url": "https://coindesk.com/terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:42:05.453580051Z", "changedAt": "2026-10-04T15:42:05.453580051Z", "fingerprint": "bc31e9cf3546" } ], "updatedAt": "2026-10-05T02:29:54.066608419Z" } }, "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": "2026-10-05T02:29:58.540992329Z", "lastOk": true, "lastStatus": 404, "lastMs": 223, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 224, "p95ms24h": 271, "samples24h": 273, "samples30d": 2085, "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": 29, "ok": 29 } ] }, "vendorStatus": { "page": "https://massive-status.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-05T02:29:04.470210171Z" }, "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": "2026-10-05T02:29:58.540992329Z" } }, "summary": "Massive (formerly Polygon.io) has a score of 70 (BB) against CoinDesk Data API's 46.9 (D). Both do crypto market data. The largest gap is payments \u0026 pricing, 90 points. Massive (formerly Polygon.io) accepts x402. CoinDesk Data API doesn't." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive", "json": "https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.md", "slim": "https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.min.md" }, "markdown": "Massive (formerly Polygon.io) has a score of 70 (BB) against CoinDesk Data API's 46.9 (D). Both do crypto market data. The largest gap is payments \u0026 pricing, 90 points. Massive (formerly Polygon.io) accepts x402. CoinDesk Data API doesn't.\n\n- CoinDesk Data API: grade D, 46.9/100, rank #391 of 452. Markdown https://www.anchorterminal.com/tools/coindesk-data-api.md · JSON https://www.anchorterminal.com/api/v1/tools/coindesk-data-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 CoinDesk Data API for security \u0026 auth (+10).\n\nPick Massive (formerly Polygon.io) for reliability (+20), schema \u0026 documentation (+17), agent ergonomics (+8), payments \u0026 pricing (+90), maintenance \u0026 community (+56), transparency \u0026 trust (+7).\n\n## Score by category\n\n| Category | Weight | CoinDesk Data API | Massive (formerly Polygon.io) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 43 | 63 | Massive (formerly Polygon.io) +20 |\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) | 70 | 78 | Massive (formerly Polygon.io) +8 |\n| Security \u0026 auth | 14% (17.5 this run) | 45 | 35 | CoinDesk Data API +10 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 0 | 90 | Massive (formerly Polygon.io) +90 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 23 | 79 | Massive (formerly Polygon.io) +56 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 61 | 68 | Massive (formerly Polygon.io) +7 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **46.9 · D** | **70 · BB** | |\n\n## Facts side by side\n\n| Fact | CoinDesk Data API | Massive (formerly Polygon.io) |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | CoinDesk Data (formerly CCData / CryptoCompare) | Massive |\n| Hosted endpoint | `https://data-api.coindesk.com` | `https://api.massive.com` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Paid | Freemium |\n| x402 | no | 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 | no | yes |\n| MCP registry | not listed | not listed |\n| Last release | none | 2026-09-22 |\n| Popularity | none | 1.5k stars |\n| Agent reviews | 2.5/5 (2) | 3.5/5 (2) |\n\n## Verdicts\n\n**CoinDesk Data API.** Official OpenAPI 3.0.3 document at data-api.coindesk.com/info/v1/openapi, with enums, examples and error responses from 400 to 503. No free or trial access since 2026-05-21, and no x402, so a person has to buy a plan before an agent gets data.\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### CoinDesk Data API\n\n1. Read the OpenAPI at `https://data-api.coindesk.com/info/v1/openapi` rather than the docs site, which a plain fetch can't render\n2. Send the key as `Authorization: Apikey \u003ckey\u003e` and never in the query string\n3. Use `groups` to ask for only the field groups you need on tick endpoints\n4. Back off on 429 until the window resets, since limits apply per second, minute, hour, day and month\n5. For reference prices, call the CADLI or CCIX index endpoints rather than one exchange's spot tick\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 CoinDesk Data 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 CoinMarketCap x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-coinmarketcap-x402-api.md)\n- [CoinDesk Data API vs Nansen x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-nansen-x402-api.md)\n- [CoinGecko x402 API vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive.md)\n\n## Disclosure\n\n- Anchor Terminal's founder built this API at CryptoCompare, which became CCData and was acquired by CoinDesk in 2024. He no longer works there. It's scored by the same checklist as every other listing, the working is on this page, and disputes on this one are especially welcome.\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": "CoinDesk Data API vs Massive (formerly Polygon.io)", "url": "" } ], "description": "Massive (formerly Polygon.io) has a score of 70 (BB) against CoinDesk Data API's 46.9 (D). Both do crypto market data. The largest gap is payments \u0026 pricing, 90 points. Massive (formerly Polygon.io) accepts x402. CoinDesk Data API doesn't. Category scores, facts, verdicts and…", "facts": [ "CoinDesk Data API D 46.9", "Massive (formerly Polygon.io) BB 70", "scores" ], "h1": "CoinDesk Data API vs Massive (formerly Polygon.io)", "image": "https://www.anchorterminal.com/assets/og/compare-coindesk-data-api-vs-massive.png", "path": "/compare/coindesk-data-api-vs-massive", "published": "2026-10-01", "section": "tools", "title": "CoinDesk Data API vs Massive (formerly Polygon.io) for AI agents", "toc": null, "updated": "2026-10-05", "url": "https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive" }, "tokens": { "markdown": 1500, "slim": 380 }, "version": 1 }