{ "data": { "a": { "slug": "intrinio", "name": "Intrinio", "vendor": "Intrinio, Inc.", "vendorUrl": "https://intrinio.com", "kind": "http-api", "category": "market-data", "summary": "Intrinio is a US financial data API from Intrinio, Inc. with stock prices, options, fundamentals, filings, estimates and news for US securities, through a REST API, websockets, SDKs in six languages and a hosted MCP server.", "url": "https://www.anchorterminal.com/tools/intrinio", "markdownUrl": "https://www.anchorterminal.com/tools/intrinio.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/intrinio.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/intrinio.json", "dns": "intrinio.grade.anchorterminal.com", "repo": "https://github.com/intrinio/python-sdk", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api-v2.intrinio.com", "packages": [ { "registry": "pypi", "name": "intrinio-sdk" } ], "auth": "api-key", "authNotes": "API key from the account page, sent as `api_key` in the query string or as `Authorization: Bearer`. Separate public keys for client-side code are restricted to listed domains and sent as `X-Authorization-Public-Key`. The hosted MCP server at intrinio-mcp.intrinio.com uses OAuth 2 with PKCE (S256), dynamic client registration, a revocation endpoint and one scope, `intrinio`. No key rotation or expiry documented.", "pricing": "paid", "pricingNotes": "Individual plan $150 a month, personal use only, no redistribution or display. Startup plan from $333 a month billed quarterly, rising to $666 after six months and $999 after twelve, with commercial use and display rights. Enterprise from $1,250 a month with an SLA, by consultation. Both self-serve plans say a free trial is available; the trial length and whether a card is needed were not found. The MCP server is included with all plans.", "priceSummary": "$150 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API documentation, pricing page, MCP page or terms (checked 2026-11-03).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 76, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-03" }, "docsUrl": "https://docs.intrinio.com/documentation/api_v2/getting_started", "capabilities": [ "market.prices", "market.fundamentals", "market.filings", "market.news", "market.history", "market.indices", "data.markets", "data.company" ], "tags": [ "official", "hosted", "paid", "free-trial", "mcp", "remote-mcp", "oauth", "status-page", "python", "closed-source" ], "lastRelease": "2026-05-27", "graded": true, "anchor": { "graded": true, "score": 54.2, "grade": "C", "agentReady": false, "rank": 879, "ranked": true, "rankOf": 1349, "categoryRank": 6, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 70, "payments": 20, "reliability": 83, "schema": 43, "security": 35, "transparency": 51 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-03" }, "negative": 0, "verdict": "A read-only US equities, options and fundamentals API with a clean status history, SDKs in six languages, paging up to 10,000 records and an OAuth MCP server included in every plan. The REST key is documented in the query string, no OpenAPI document or llms.txt was found, the version history is undated, and plans start at $150 a month.", "bestFor": "An agent doing US equity, options and fundamentals research on a paid plan that wants one vendor for prices, filings, estimates and an OAuth MCP server.", "strengths": [ "Statuspage at status.intrinio.com with no incident since 24 June 2026", "Hosted MCP server with OAuth 2 PKCE, dynamic client registration and a revocation endpoint, described as read-only and included with all plans", "Paging up to 10,000 records a page with a `next_page` token, and SDKs for Python, C#, Java, JavaScript, R and Ruby", "Plan prices published without a login, from $150 a month, with a free trial on the Individual and Startup plans", "Response codes documented, with 429 for limits and 503 for throttling or the 25-second timeout" ], "weaknesses": [ "The API key is documented as `api_key` in the query string as the first option, with no scopes, rotation or expiry found", "No OpenAPI document, llms.txt or Markdown docs for agents were found; the SDKs are generated from a spec that isn't published", "The version history lists API 2.0.0 to 2.6.2 with no dates, and the SDK declares API version 2.135.4", "No security.txt, bug bounty, SOC 2 or ISO 27001 was found, and the privacy policy of 30 June 2018 names no retention periods or subprocessors", "Individual plans are personal use only, and display or redistribution needs a Startup or Enterprise order form" ], "agentNotes": [ "Send the key as `Authorization: Bearer`, not `?api_key=`, so it stays out of logs", "Expect 403 for a data feed the account isn't subscribed to, 429 with an explanation when a limit is hit, and 503 when a request passes 25 seconds; shrink the query rather than retry at once", "Keep `page_size` at 100 or below unless the plan is paid, since larger pages are limited to one request a minute on free feeds", "Confirm the plan before displaying or passing Intrinio data to anyone else; the Individual plan forbids it", "The MCP server returns a message naming the product that unlocks data outside the plan; don't retry the same call" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 54.2 } ], "editorialScores": { "ergonomics": 70, "maintenance": 70, "payments": 20, "reliability": 83, "schema": 43, "security": 35, "transparency": 31 }, "provenanceScore": 71, "checked": { "categories": { "ergonomics": "2026-11-03", "maintenance": "2026-11-03", "payments": "2026-11-03", "reliability": "2026-11-03", "schema": "2026-11-03", "security": "2026-11-03", "transparency": "2026-11-03" }, "last": "2026-11-03", "oldest": "2026-11-03", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install intrinio-sdk", "http": "curl -H \"Authorization: Bearer $INTRINIO_API_KEY\" \"https://api-v2.intrinio.com/securities/AAPL/prices\"", "claudeCode": "claude mcp add --transport http intrinio https://intrinio-mcp.intrinio.com/mcp", "config": { "mcpServers": { "intrinio": { "url": "https://intrinio-mcp.intrinio.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/market.prices", "tool": "https://letme.dev/intrinio" }, "area": "domain-data", "unitPrices": [ { "item": "Individual plan", "unit": "month", "usd": 150, "note": "personal use only, monthly billing" }, { "item": "Startup plan, first six months", "unit": "month", "usd": 333, "note": "billed quarterly; $666 for the next six months, $999 a month after that" }, { "item": "Enterprise plan, from", "unit": "month", "usd": 1250, "note": "custom terms, by consultation" } ], "provenance": { "legalEntity": "Intrinio, Inc.", "domain": "intrinio.com", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://about.intrinio.com/terms", "privacy": "https://about.intrinio.com/privacy", "statusPage": "https://status.intrinio.com", "changelog": "https://docs.intrinio.com/documentation/api_v2/version_history", "securityTxt": "none", "checked": "2026-11-03", "notes": [ "Intrinio, Inc. is named as a Delaware corporation in the terms (effective 3 September 2026) and the privacy policy (effective 30 June 2018), both under Florida law.", "The terms have no clause on automated reading of the website. Section 8(f) forbids software designed to collect information from the Services, and section 2.3 applies the data restrictions to AI and machine learning systems.", "intrinio.com/robots.txt disallows /docs/* for all crawlers, so the documentation was read at docs.intrinio.com, whose robots.txt allows everything. about.intrinio.com, ascend.intrinio.com and status.intrinio.com allow everything.", "RDAP for intrinio.com was refused (403 from rdap.org), so the registration date is unchecked.", "/.well-known/security.txt returns 404 on intrinio.com. docs.intrinio.com/llms.txt and intrinio.com/llms.txt return 404.", "The MCP server's OAuth metadata was read at /.well-known/oauth-authorization-server and /.well-known/oauth-protected-resource; no MCP session was opened." ], "score": 71 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/intrinio.json", "live": { "slug": "intrinio", "probe": { "target": "https://api-v2.intrinio.com", "method": "get", "lastAt": "2026-11-04T19:34:48.328377934Z", "lastOk": true, "lastStatus": 200, "lastMs": 502, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 435, "p95ms24h": 1129, "samples24h": 43, "samples30d": 43, "days": [ { "date": "2026-11-04", "probes": 43, "ok": 43 } ] }, "vendorStatus": { "page": "https://status.intrinio.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-04T19:31:39.925986306Z" }, "securityTxt": { "url": "https://intrinio.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-04T15:53:22.904326032Z" }, "updatedAt": "2026-11-04T19:34:48.328377934Z" } }, "answer": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Intrinio's 54.2 (C), and leads in 5 of 7 scored categories. Intrinio leads on reliability.", "b": { "slug": "massive", "name": "Massive (formerly Polygon.io)", "vendor": "Massive", "vendorUrl": "https://massive.com", "kind": "http-api", "category": "market-data", "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", "dns": "massive.grade.anchorterminal.com", "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, 24 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 24 GET routes at $0.01 each on Base, US stocks only, covering aggregates, snapshots, indicators, reference data, news and SEC filings (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": [ "market.prices", "market.history", "data.markets", "market.crypto", "market.indices" ], "tags": [ "official", "hosted", "x402", "freemium", "openapi", "llms-txt", "mcp" ], "lastRelease": "2026-10-28", "graded": true, "anchor": { "graded": true, "score": 73.1, "grade": "BB", "agentReady": true, "rank": 100, "ranked": true, "rankOf": 1349, "categoryRank": 1, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 78, "maintenance": 82, "payments": 90, "reliability": 78, "schema": 89, "security": 35, "transparency": 67 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-01" }, "negative": 0, "verdict": "24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. The status history lists 14 partial incidents in the 90 days to 1 November, including US equity aggregate bars missing for about 16 hours on 8 and 9 September.", "bestFor": "Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402.", "strengths": [ "24 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 160 endpoint pages", "Official clients in Python, JavaScript, Go and the JVM, regenerated from the OpenAPI spec as recently as 27 October 2026", "Incidents posted with start and end times on a Statuspage history feed", "Six dated changelog entries between 25 August and 28 October 2026" ], "weaknesses": [ "14 partial incidents from 3 August to 1 November 2026, mostly stale or missing data on stock aggregates and quotes", "x402 covers US stocks only, with no ticks, streaming or other asset classes", "The API key is accepted as `?apiKey=` in the query string, the only scheme the OpenAPI file declares", "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 since August were bars that stopped updating or went missing", "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": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 73.1 } ], "editorialScores": { "ergonomics": 78, "maintenance": 82, "payments": 90, "reliability": 78, "schema": 89, "security": 35, "transparency": 45 }, "provenanceScore": 88, "dataQualityScore": 87, "checked": { "categories": { "ergonomics": "2026-11-01", "maintenance": "2026-11-01", "payments": "2026-11-01", "reliability": "2026-11-01", "schema": "2026-11-01", "security": "2026-11-01", "transparency": "2026-11-01" }, "last": "2026-11-01", "lastMoved": "2026-11-01", "oldest": "2026-11-01", "stale": false, "staleAfterDays": 90 } }, "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/market.prices", "tool": "https://letme.dev/massive" }, "area": "domain-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": "2026-11-01", "score": 88 }, "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": "2026-11-04T19:34:53.381369549Z", "lastOk": true, "lastStatus": 404, "lastMs": 307, "authRequired": false, "uptime24h": 100, "uptime30d": 99.98, "p50ms24h": 267, "p95ms24h": 358, "samples24h": 247, "samples30d": 8069, "days": [ { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 248 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 251, "ok": 251 }, { "date": "2026-10-29", "probes": 248, "ok": 248 }, { "date": "2026-10-30", "probes": 249, "ok": 248 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 202, "ok": 202 } ] }, "vendorStatus": { "page": "https://massive-status.com", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-11-04T19:31:43.686632907Z" }, "versions": [ { "registry": "github", "name": "massive-com/client-python", "version": "v2.9.1", "released": "2026-10-26", "seenAt": "2026-11-03T20:38:07.628511208Z" } ], "githubStars": 1523, "securityTxt": { "url": "https://massive.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-04T15:52:42.899942093Z" }, "llmsTxt": { "url": "https://massive.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-04T15:23:22.551811497Z" }, "domain": { "domain": "massive.com", "registered": "1995-02-13", "source": "https://rdap.verisign.com/com/v1/domain/massive.com", "checkedAt": "2026-11-01T14:07:32.013168238Z" }, "pages": [ { "url": "https://massive.com/changelog", "kind": "deprecations", "status": 200, "checkedAt": "2026-11-04T08:27:39.330534708Z", "changedAt": "2026-10-31T06:16:01.564939681Z", "fingerprint": "0cd6bc9476ca" }, { "url": "https://massive.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-04T08:27:45.659813839Z", "changedAt": "2026-10-31T06:16:08.173405264Z", "fingerprint": "c06a4148bf72" }, { "url": "https://massive.com/legal/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-04T08:27:43.705812993Z", "changedAt": "2026-10-31T06:16:05.957773097Z", "fingerprint": "1c9024302c92" }, { "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": "2026-11-04T08:27:41.718942017Z", "changedAt": "2026-10-31T06:16:03.806023028Z", "fingerprint": "f4ec38dadfe4" } ], "github": { "repo": "massive-com/client-python", "checkedAt": "2026-11-02T09:03:56.959547185Z", "stars": 1523, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-26T16:33:41Z", "openIssues": 13, "openPRs": 8, "issuesOpened90d": 4, "issuesClosed90d": 3, "prsMerged90d": 14, "ci": { "branch": "master", "runs": 50, "success": 48, "failure": 2, "other": 0, "latest": "success", "latestAt": "2026-10-26T04:23:15Z" }, "replies": { "sampled": 25, "unanswered": 7, "medianDays": 1.1 } }, "updatedAt": "2026-11-04T19:34:53.381369549Z" } }, "edges": [ { "by": 70, "category": "payments", "leads": "massive", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0). Plan prices are public without a login, $150, $333 rising to $999, and $1,250 and up, with no per-call price (10). Both self-serve plans say a free trial is available, and the trial length and card requirement were not found on the pricing, plan or terms pages, since the plan pages are drawn by script (10 of 20). A person signs up in a browser; no key API was found (0). Total 20.", "b": "x402 on its own domain at agent.massive.com since 1 September, but only 23 US stock routes. Options, indices, forex, crypto, futures, tick data and streaming still need a key (30 of 40). $0.01 a route on Agentic.Market, which the docs link to, and plan prices on massive.com/pricing, all without a login (20). Free Basic plan at 5 calls a minute with end-of-day data. The pricing page doesn't say a card is needed (20). An agent with a funded Base wallet can pay with no account (20)." }, "scores": { "a": 20, "b": 90 } }, { "by": 46, "category": "schema", "leads": "massive", "name": "Schema \u0026 documentation", "reasons": { "a": "No OpenAPI document was found. The SDKs are generated from a spec that declares API version 2.135.4, but the spec itself isn't published, and the MCP server's tool definitions aren't in any public source (5 of 25). docs.intrinio.com/llms.txt and intrinio.com/llms.txt return 404, and there are no Markdown pages (0 of 10). Each endpoint page states what it returns with its parameters, with little on when not to use a call (12 of 20). Parameters are typed, with required ones marked and allowed values in prose (9 of 15). Code samples in six languages on every endpoint, and a response codes page that lists codes without a body format (10 of 15). The v2 path is versioned, but the version history lists 2.0.0 to 2.6.2 with no dates and is out of step with the SDK's API version (7 of 15). Total 43.", "b": "OpenAPI document at api.massive.com/openapi (OpenAPI 3.0.3, 148 paths) with enums such as `timespan` and `sort`, and 400, 401 and 404 responses defined (25). llms.txt at massive.com/docs/rest/llms.txt indexing about 160 endpoint pages (10). One-line descriptions per endpoint in the index, longer ones in the reference, with little on when not to use a call (14 of 20). Typed path and query parameters with enums and required fields (13 of 15). Examples in the docs and error responses in the spec, though the llms.txt says nothing about error shapes (12 of 15). Versioned paths from /v1 to /v3 and a dated public changelog (15)." }, "scores": { "a": 43, "b": 89 } }, { "by": 16, "category": "transparency", "leads": "massive", "name": "Transparency \u0026 trust", "reasons": { "a": "A closed service under terms effective 3 September 2026 that are clear on personal, internal and commercial use and name Intrinio, Inc. (15 of 30). The privacy policy is dated 30 June 2018, names no retention periods, subprocessors or DPA, and says only that connection details may be retained; the terms require deletion within 30 days of termination with an officer's certification (8 of 30). No deprecation policy, and the version history has no dates (3 of 20). Data is processed in the United States; no subprocessor list (5 of 20). Total 31.", "b": "Closed service under business terms last updated 6 October 2026, Massive.com, Inc. under Georgia law, which now also cover pay-per-request purchases without an account. The MCP server and clients are MIT (15). Privacy policy last updated 22 March 2024, with retention 'as long as we are providing the Services' and no periods. The business terms require deleting data on termination. No DPA found (12 of 30). Dated sunsets in the changelog. The terms let Massive change the Services at its discretion, with a 30-day route to report a change that materially degrades a subscribed service (10 of 20). Stripe, Google and Hotjar are named, and data may sit 'in the United States and locations around the world'. No subprocessor list (8 of 20)." }, "scores": { "a": 51, "b": 67 } }, { "by": 12, "category": "maintenance", "leads": "massive", "name": "Maintenance \u0026 community", "reasons": { "a": "The six real-time websocket SDK repositories were pushed between 22 and 29 October 2026, and the MCP server is labelled New on the vendor's page (30). The last tagged release found is intrinio-sdk 7.2.0 on PyPI on 27 May 2026, following 7.0.0 on 2 March and 7.1.0 on 24 March; the October pushes have no tags or dated changelog entries, and the API version history carries no dates (10 of 20). Support is live chat through HubSpot, an AI chat and support@intrinio.com, with a status page; GitHub issue activity was not read (8 of 15). Official SDKs are current in six languages (15). The Python SDK is generated by swagger-codegen with CI not checked (7 of 10). Total 70.", "b": "Newest changelog entry 2026-10-28, new Insider Trading Activity and Insider Holdings endpoints (30). Changelog entries on 25 August, 1 September, 22 September, 2 October, 16 October and 28 October, six in 90 days, besides client releases (20). Public changelog and a support channel. We couldn't read GitHub issue activity in this run (10 of 15). Official clients are current, with Python v2.9.0 on 2026-10-16 and v2.9.1 on 2026-10-25, Go v3.5.0, v3.6.0 and v3.7.0 between 20 and 27 October and JavaScript v10.8.0 on 2026-09-17, each regenerated from the OpenAPI spec (15). The MCP and client repos run CI. The MCP server repository is still at v0.10.0 of 2026-05-05 and its README still calls the project experimental (7 of 10)." }, "scores": { "a": 70, "b": 82 } }, { "by": 8, "category": "ergonomics", "leads": "massive", "name": "Agent ergonomics", "reasons": { "a": "`page_size` from 100 up to 10,000 sizes a response, and the MCP server batches ticker lists, but there is no field selection (15 of 25). `next_page` tokens, date and symbol filters on the data endpoints (18 of 20). Response codes are documented, 403 for an unsubscribed feed and 429 with a limit explanation, with no error body format or error code reference (10 of 20). Every call is a read and the vendor says the MCP server writes nothing back, but no readOnlyHint or safe-retry guidance was found (12 of 20). Few required parameters, and official SDKs in Python, C#, Java, JavaScript, R and Ruby (15). Total 70.", "b": "`limit`, `sort` and `adjusted` on most list and aggregate calls, no field selection found (15 of 25). `next_url` pagination that the official clients follow for you, plus date and ticker filters (18 of 20). Errors in the spec carry a status and message, with 400 responses on 64 of the 148 operations (14 of 20). All market data calls are GETs, and the x402 docs say only successful requests are charged and each page is charged separately. The hosted MCP's three tools carry readOnlyHint, per the 1 October check (16 of 20). Official clients in Python, JavaScript, Go and the JVM, with few required parameters (15)." }, "scores": { "a": 70, "b": 78 } }, { "by": 5, "category": "reliability", "leads": "intrinio", "name": "Reliability", "reasons": { "a": "Graded as a hosted service. Atlassian Statuspage at status.intrinio.com with APIv2 and APIv1 components (20). The incident feed's newest entry is a delayed SIP feed for CTA on 24 June 2026, so the 90 days to 3 November are clean (30). Limits are published in part. Pages above 100 records and bulk requests are 1 a minute on free feeds and 1 a second on paid ones, free feeds are throttled at 100 requests a second, and the daily and per-minute caps for a plan are shown only on the account page (8 of 15). A 429 carries an explanation of the limit and a 503 marks throttling or the 25-second timeout, with no Retry-After or backoff guidance (5 of 15). The Enterprise plan lists an SLA (10). The REST API is generally available (10). Total 83.", "b": "Atlassian Statuspage at massive-status.com with REST, WebSocket and flat-file components for each asset class (20). The history feed lists 14 unplanned incidents from 3 August to 1 November 2026, each limited to one product, one endpoint, one asset class or some accounts. They include US equity aggregate bars missing for roughly two-thirds of US equities from 18:46 ET on 8 September until 10:29 the next day, stale stocks quotes on 20 August, and slow responses with intermittent 502s on stocks v2 aggregates from 10:37 to 13:08 ET on 2 September. The newest, on 27 October, was delayed WebSocket data and REST errors for some accounts from 13:49 to 14:17 EDT. Read the way partial incidents are read on other listings, that is minor incidents only (20). Free plan limited to 5 calls a minute, paid plans unlimited, nothing stated for x402 (10 of 15). No 429 or Retry-After guidance found in the docs or the OpenAPI file, though the official Python client retries 429 with backoff (8 of 15). The business terms dated 6 October 2026 point to a separate Support Policy and SLA document for customers who buy service levels (10). The REST API is generally available (10)." }, "scores": { "a": 83, "b": 78 } } ], "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Intrinio, Inc.", "b": "Massive", "name": "Vendor" }, { "a": "https://api-v2.intrinio.com", "b": "https://api.massive.com", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Paid", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "yes, from $0.01/call", "name": "x402" }, { "a": "none", "b": "MIT (clients)", "name": "Licence" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2026-05-27", "b": "2026-10-28", "name": "Last release" }, { "a": "no date given", "b": "2026-10-06", "name": "Terms last updated" }, { "a": "no date given", "b": "2024-03-22", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "yes", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "76 stars", "b": "1.5k stars", "name": "Popularity" }, { "a": "none", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Intrinio's 54.2 (C), and leads in 5 of 7 scored categories. Intrinio leads on reliability.", "question": "Which is better for AI agents, Intrinio or Massive (formerly Polygon.io)?" }, { "answer": "Both need an API key. An agent can also pay Massive (formerly Polygon.io) per call over x402, with no account.", "question": "Do Intrinio and Massive (formerly Polygon.io) need an API key?" }, { "answer": "Yes. Intrinio has a hosted endpoint at https://api-v2.intrinio.com and Massive (formerly Polygon.io) at https://api.massive.com.", "question": "Can an agent call Intrinio and Massive (formerly Polygon.io) without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 83 against 78" ], "also": null, "goodFor": "An agent doing US equity, options and fundamentals research on a paid plan that wants one vendor for prices, filings, estimates and an OAuth MCP server.", "slug": "intrinio", "watchFor": "The API key is documented as `api_key` in the query string as the first option, with no scopes, rotation or expiry found" }, { "aheadOn": [ "Schema \u0026 documentation, 89 against 43", "Agent ergonomics, 78 against 70", "Payments \u0026 pricing, 90 against 20", "Maintenance \u0026 community, 82 against 70", "Transparency \u0026 trust, 67 against 51" ], "also": [ "Agent-ready, a grade of BB or better", "An agent can pay per call over x402, with no account" ], "goodFor": "Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402.", "slug": "massive", "watchFor": "14 partial incidents from 3 August to 1 November 2026, mostly stale or missing data on stock aggregates and quotes" } ], "history": { "intrinio": null, "massive": [ { "causes": [ "product", "correction" ], "date": "2026-11-01", "delta": 3.2, "from": 69.9, "fromGrade": "B", "to": 73.1, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.1, "from": 69.8, "fromGrade": "B", "to": 69.9, "toGrade": "B" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.2, "from": 70, "fromGrade": "BB", "to": 69.8, "toGrade": "B" } ] }, "job": { "capability": "market.prices", "name": "Market prices" }, "others": [ { "json": "https://www.anchorterminal.com/compare/alpha-vantage-vs-intrinio.json", "title": "Alpha Vantage vs Intrinio", "url": "https://www.anchorterminal.com/compare/alpha-vantage-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.json", "title": "Alpha Vantage vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/alpha-vantage-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/benzinga-vs-massive.json", "title": "Benzinga vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/benzinga-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-intrinio.json", "title": "Databento vs Intrinio", "url": "https://www.anchorterminal.com/compare/databento-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-massive.json", "title": "Databento vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/databento-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/financial-datasets-vs-massive.json", "title": "Financial Datasets vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/financial-datasets-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/financial-modeling-prep-vs-massive.json", "title": "Financial Modeling Prep vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/financial-modeling-prep-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/finnhub-vs-intrinio.json", "title": "Finnhub vs Intrinio", "url": "https://www.anchorterminal.com/compare/finnhub-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/finnhub-vs-massive.json", "title": "Finnhub vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/finnhub-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/intrinio-vs-tiingo.json", "title": "Intrinio vs Tiingo", "url": "https://www.anchorterminal.com/compare/intrinio-vs-tiingo" }, { "json": "https://www.anchorterminal.com/compare/intrinio-vs-twelve-data.json", "title": "Intrinio vs Twelve Data", "url": "https://www.anchorterminal.com/compare/intrinio-vs-twelve-data" }, { "json": "https://www.anchorterminal.com/compare/massive-vs-tiingo.json", "title": "Massive (formerly Polygon.io) vs Tiingo", "url": "https://www.anchorterminal.com/compare/massive-vs-tiingo" }, { "json": "https://www.anchorterminal.com/compare/massive-vs-twelve-data.json", "title": "Massive (formerly Polygon.io) vs Twelve Data", "url": "https://www.anchorterminal.com/compare/massive-vs-twelve-data" }, { "json": "https://www.anchorterminal.com/compare/financial-datasets-vs-intrinio.json", "title": "Financial Datasets vs Intrinio", "url": "https://www.anchorterminal.com/compare/financial-datasets-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/financial-modeling-prep-vs-intrinio.json", "title": "Financial Modeling Prep vs Intrinio", "url": "https://www.anchorterminal.com/compare/financial-modeling-prep-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/eodhd-vs-intrinio.json", "title": "EODHD vs Intrinio", "url": "https://www.anchorterminal.com/compare/eodhd-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/eodhd-vs-massive.json", "title": "EODHD vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/eodhd-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/benzinga-vs-intrinio.json", "title": "Benzinga vs Intrinio", "url": "https://www.anchorterminal.com/compare/benzinga-vs-intrinio" } ], "panel": null, "scores": [ { "by": 5, "edge": "intrinio", "intrinio": 83, "key": "reliability", "massive": 78, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 46, "edge": "massive", "intrinio": 43, "key": "schema", "massive": 89, "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 8, "edge": "massive", "intrinio": 70, "key": "ergonomics", "massive": 78, "name": "Agent ergonomics", "weight": 13 }, { "by": 0, "edge": "", "intrinio": 35, "key": "security", "massive": 35, "name": "Security \u0026 auth", "weight": 14 }, { "by": 70, "edge": "massive", "intrinio": 20, "key": "payments", "massive": 90, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 12, "edge": "massive", "intrinio": 70, "key": "maintenance", "massive": 82, "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 16, "edge": "massive", "intrinio": 51, "key": "transparency", "massive": 67, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Intrinio's 54.2 (C), and leads in 5 of 7 scored categories. Intrinio leads on reliability. Both do market prices. Massive (formerly Polygon.io) accepts x402. Intrinio doesn't.", "tasks": null, "tutorials": [], "verdicts": { "intrinio": "A read-only US equities, options and fundamentals API with a clean status history, SDKs in six languages, paging up to 10,000 records and an OAuth MCP server included in every plan. The REST key is documented in the query string, no OpenAPI document or llms.txt was found, the version history is undated, and plans start at $150 a month.", "massive": "24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. The status history lists 14 partial incidents in the 90 days to 1 November, including US equity aggregate bars missing for about 16 hours on 8 and 9 September." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/intrinio-vs-massive", "json": "https://www.anchorterminal.com/compare/intrinio-vs-massive.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/intrinio-vs-massive.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/intrinio-vs-massive.min.md" }, "markdown": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Intrinio's 54.2 (C), and leads in 5 of 7 scored categories. Intrinio leads on reliability. Both do market prices. Massive (formerly Polygon.io) accepts x402. Intrinio doesn't.\n\n- Intrinio: grade C, 54.2/100, rank #879 of 1349. Markdown https://www.anchorterminal.com/tools/intrinio.md · JSON https://www.anchorterminal.com/api/v1/tools/intrinio.json\n- Massive (formerly Polygon.io): grade BB, 73.1/100, rank #100 of 1349. Markdown https://www.anchorterminal.com/tools/massive.md · JSON https://www.anchorterminal.com/api/v1/tools/massive.json\n- Best financial market data APIs for AI agents: https://www.anchorterminal.com/best/market-data/index.md\n- All 55 markets comparisons: https://www.anchorterminal.com/compare/market-data/index.md\n\n## Which one, for what\n\n### Intrinio (C)\n\nGood for: An agent doing US equity, options and fundamentals research on a paid plan that wants one vendor for prices, filings, estimates and an OAuth MCP server.\n\nAhead on:\n- Reliability, 83 against 78\n\nWatch for: The API key is documented as `api_key` in the query string as the first option, with no scopes, rotation or expiry found\n\n### Massive (formerly Polygon.io) (BB)\n\nGood for: Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402.\n\nAhead on:\n- Schema \u0026 documentation, 89 against 43\n- Agent ergonomics, 78 against 70\n- Payments \u0026 pricing, 90 against 20\n- Maintenance \u0026 community, 82 against 70\n- Transparency \u0026 trust, 67 against 51\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- An agent can pay per call over x402, with no account\n\nWatch for: 14 partial incidents from 3 August to 1 November 2026, mostly stale or missing data on stock aggregates and quotes\n\n\n## Why the edge\n\n### Payments \u0026 pricing: Massive (formerly Polygon.io) +70\n\n- Intrinio (20): No x402, MPP or L402 (0). Plan prices are public without a login, $150, $333 rising to $999, and $1,250 and up, with no per-call price (10). Both self-serve plans say a free trial is available, and the trial length and card requirement were not found on the pricing, plan or terms pages, since the plan pages are drawn by script (10 of 20). A person signs up in a browser; no key API was found (0). Total 20.\n- Massive (formerly Polygon.io) (90): x402 on its own domain at agent.massive.com since 1 September, but only 23 US stock routes. Options, indices, forex, crypto, futures, tick data and streaming still need a key (30 of 40). $0.01 a route on Agentic.Market, which the docs link to, and plan prices on massive.com/pricing, all without a login (20). Free Basic plan at 5 calls a minute with end-of-day data. The pricing page doesn't say a card is needed (20). An agent with a funded Base wallet can pay with no account (20).\n\n### Schema \u0026 documentation: Massive (formerly Polygon.io) +46\n\n- Intrinio (43): No OpenAPI document was found. The SDKs are generated from a spec that declares API version 2.135.4, but the spec itself isn't published, and the MCP server's tool definitions aren't in any public source (5 of 25). docs.intrinio.com/llms.txt and intrinio.com/llms.txt return 404, and there are no Markdown pages (0 of 10). Each endpoint page states what it returns with its parameters, with little on when not to use a call (12 of 20). Parameters are typed, with required ones marked and allowed values in prose (9 of 15). Code samples in six languages on every endpoint, and a response codes page that lists codes without a body format (10 of 15). The v2 path is versioned, but the version history lists 2.0.0 to 2.6.2 with no dates and is out of step with the SDK's API version (7 of 15). Total 43.\n- Massive (formerly Polygon.io) (89): OpenAPI document at api.massive.com/openapi (OpenAPI 3.0.3, 148 paths) with enums such as `timespan` and `sort`, and 400, 401 and 404 responses defined (25). llms.txt at massive.com/docs/rest/llms.txt indexing about 160 endpoint pages (10). One-line descriptions per endpoint in the index, longer ones in the reference, with little on when not to use a call (14 of 20). Typed path and query parameters with enums and required fields (13 of 15). Examples in the docs and error responses in the spec, though the llms.txt says nothing about error shapes (12 of 15). Versioned paths from /v1 to /v3 and a dated public changelog (15).\n\n### Transparency \u0026 trust: Massive (formerly Polygon.io) +16\n\n- Intrinio (51): A closed service under terms effective 3 September 2026 that are clear on personal, internal and commercial use and name Intrinio, Inc. (15 of 30). The privacy policy is dated 30 June 2018, names no retention periods, subprocessors or DPA, and says only that connection details may be retained; the terms require deletion within 30 days of termination with an officer's certification (8 of 30). No deprecation policy, and the version history has no dates (3 of 20). Data is processed in the United States; no subprocessor list (5 of 20). Total 31.\n- Massive (formerly Polygon.io) (67): Closed service under business terms last updated 6 October 2026, Massive.com, Inc. under Georgia law, which now also cover pay-per-request purchases without an account. The MCP server and clients are MIT (15). Privacy policy last updated 22 March 2024, with retention 'as long as we are providing the Services' and no periods. The business terms require deleting data on termination. No DPA found (12 of 30). Dated sunsets in the changelog. The terms let Massive change the Services at its discretion, with a 30-day route to report a change that materially degrades a subscribed service (10 of 20). Stripe, Google and Hotjar are named, and data may sit 'in the United States and locations around the world'. No subprocessor list (8 of 20).\n\n### Maintenance \u0026 community: Massive (formerly Polygon.io) +12\n\n- Intrinio (70): The six real-time websocket SDK repositories were pushed between 22 and 29 October 2026, and the MCP server is labelled New on the vendor's page (30). The last tagged release found is intrinio-sdk 7.2.0 on PyPI on 27 May 2026, following 7.0.0 on 2 March and 7.1.0 on 24 March; the October pushes have no tags or dated changelog entries, and the API version history carries no dates (10 of 20). Support is live chat through HubSpot, an AI chat and support@intrinio.com, with a status page; GitHub issue activity was not read (8 of 15). Official SDKs are current in six languages (15). The Python SDK is generated by swagger-codegen with CI not checked (7 of 10). Total 70.\n- Massive (formerly Polygon.io) (82): Newest changelog entry 2026-10-28, new Insider Trading Activity and Insider Holdings endpoints (30). Changelog entries on 25 August, 1 September, 22 September, 2 October, 16 October and 28 October, six in 90 days, besides client releases (20). Public changelog and a support channel. We couldn't read GitHub issue activity in this run (10 of 15). Official clients are current, with Python v2.9.0 on 2026-10-16 and v2.9.1 on 2026-10-25, Go v3.5.0, v3.6.0 and v3.7.0 between 20 and 27 October and JavaScript v10.8.0 on 2026-09-17, each regenerated from the OpenAPI spec (15). The MCP and client repos run CI. The MCP server repository is still at v0.10.0 of 2026-05-05 and its README still calls the project experimental (7 of 10).\n\n### Agent ergonomics: Massive (formerly Polygon.io) +8\n\n- Intrinio (70): `page_size` from 100 up to 10,000 sizes a response, and the MCP server batches ticker lists, but there is no field selection (15 of 25). `next_page` tokens, date and symbol filters on the data endpoints (18 of 20). Response codes are documented, 403 for an unsubscribed feed and 429 with a limit explanation, with no error body format or error code reference (10 of 20). Every call is a read and the vendor says the MCP server writes nothing back, but no readOnlyHint or safe-retry guidance was found (12 of 20). Few required parameters, and official SDKs in Python, C#, Java, JavaScript, R and Ruby (15). Total 70.\n- Massive (formerly Polygon.io) (78): `limit`, `sort` and `adjusted` on most list and aggregate calls, no field selection found (15 of 25). `next_url` pagination that the official clients follow for you, plus date and ticker filters (18 of 20). Errors in the spec carry a status and message, with 400 responses on 64 of the 148 operations (14 of 20). All market data calls are GETs, and the x402 docs say only successful requests are charged and each page is charged separately. The hosted MCP's three tools carry readOnlyHint, per the 1 October check (16 of 20). Official clients in Python, JavaScript, Go and the JVM, with few required parameters (15).\n\n### Reliability: Intrinio +5\n\n- Intrinio (83): Graded as a hosted service. Atlassian Statuspage at status.intrinio.com with APIv2 and APIv1 components (20). The incident feed's newest entry is a delayed SIP feed for CTA on 24 June 2026, so the 90 days to 3 November are clean (30). Limits are published in part. Pages above 100 records and bulk requests are 1 a minute on free feeds and 1 a second on paid ones, free feeds are throttled at 100 requests a second, and the daily and per-minute caps for a plan are shown only on the account page (8 of 15). A 429 carries an explanation of the limit and a 503 marks throttling or the 25-second timeout, with no Retry-After or backoff guidance (5 of 15). The Enterprise plan lists an SLA (10). The REST API is generally available (10). Total 83.\n- Massive (formerly Polygon.io) (78): Atlassian Statuspage at massive-status.com with REST, WebSocket and flat-file components for each asset class (20). The history feed lists 14 unplanned incidents from 3 August to 1 November 2026, each limited to one product, one endpoint, one asset class or some accounts. They include US equity aggregate bars missing for roughly two-thirds of US equities from 18:46 ET on 8 September until 10:29 the next day, stale stocks quotes on 20 August, and slow responses with intermittent 502s on stocks v2 aggregates from 10:37 to 13:08 ET on 2 September. The newest, on 27 October, was delayed WebSocket data and REST errors for some accounts from 13:49 to 14:17 EDT. Read the way partial incidents are read on other listings, that is minor incidents only (20). Free plan limited to 5 calls a minute, paid plans unlimited, nothing stated for x402 (10 of 15). No 429 or Retry-After guidance found in the docs or the OpenAPI file, though the official Python client retries 429 with backoff (8 of 15). The business terms dated 6 October 2026 point to a separate Support Policy and SLA document for customers who buy service levels (10). The REST API is generally available (10).\n\n## Score by category\n\n| Category | Weight | Intrinio | Massive (formerly Polygon.io) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 83 | 78 | Intrinio +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 43 | 89 | Massive (formerly Polygon.io) +46 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 78 | Massive (formerly Polygon.io) +8 |\n| Security \u0026 auth | 14% (17.5 this run) | 35 | 35 | even |\n| Payments \u0026 pricing | 10% (12.5 this run) | 20 | 90 | Massive (formerly Polygon.io) +70 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 70 | 82 | Massive (formerly Polygon.io) +12 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 51 | 67 | Massive (formerly Polygon.io) +16 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **54.2 · C** | **73.1 · BB** | |\n\n## Facts side by side\n\n| Fact | Intrinio | Massive (formerly Polygon.io) |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Intrinio, Inc. | Massive |\n| Hosted endpoint | `https://api-v2.intrinio.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 | none | MIT (clients) |\n| Read-only variant documented | yes | no |\n| llms.txt | no | yes |\n| Last release | 2026-05-27 | 2026-10-28 |\n| Terms last updated | no date given | 2026-10-06 |\n| Privacy policy last updated | no date given | 2024-03-22 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 76 stars | 1.5k stars |\n| Agent reviews | none | 3.5/5 (2) |\n\n## How the scores have moved\n\n### Intrinio\n\nNo score change since it was listed.\n\n### Massive (formerly Polygon.io)\n\n- +3.2 on 1 November 2026 (B to BB): product, correction\n- +0.1 on 27 October 2026: checklist\n- -0.2 on 8 October 2026 (BB to B): checklist\n\n## Verdicts\n\n**Intrinio.** A read-only US equities, options and fundamentals API with a clean status history, SDKs in six languages, paging up to 10,000 records and an OAuth MCP server included in every plan. The REST key is documented in the query string, no OpenAPI document or llms.txt was found, the version history is undated, and plans start at $150 a month.\n\n**Massive (formerly Polygon.io).** 24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. The status history lists 14 partial incidents in the 90 days to 1 November, including US equity aggregate bars missing for about 16 hours on 8 and 9 September.\n\n## Before you call either\n\n### Intrinio\n\n1. Send the key as `Authorization: Bearer`, not `?api_key=`, so it stays out of logs\n2. Expect 403 for a data feed the account isn't subscribed to, 429 with an explanation when a limit is hit, and 503 when a request passes 25 seconds; shrink the query rather than retry at once\n3. Keep `page_size` at 100 or below unless the plan is paid, since larger pages are limited to one request a minute on free feeds\n4. Confirm the plan before displaying or passing Intrinio data to anyone else; the Individual plan forbids it\n5. The MCP server returns a message naming the product that unlocks data outside the plan; don't retry the same call\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 since August were bars that stopped updating or went missing\n5. Don't republish prices fetched on an individual plan\n\n## Questions\n\n### Which is better for AI agents, Intrinio or Massive (formerly Polygon.io)?\n\nMassive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Intrinio's 54.2 (C), and leads in 5 of 7 scored categories. Intrinio leads on reliability.\n\n### Do Intrinio and Massive (formerly Polygon.io) need an API key?\n\nBoth need an API key. An agent can also pay Massive (formerly Polygon.io) per call over x402, with no account.\n\n### Can an agent call Intrinio and Massive (formerly Polygon.io) without installing anything?\n\nYes. Intrinio has a hosted endpoint at https://api-v2.intrinio.com and Massive (formerly Polygon.io) at https://api.massive.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/intrinio-vs-massive.json, and with the fewest tokens: https://www.anchorterminal.com/compare/intrinio-vs-massive.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"intrinio\", \"b\": \"massive\"}`. From a terminal: `anchor compare intrinio massive`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/intrinio.json and https://www.anchorterminal.com/api/v1/tools/massive.json\n\n## Other comparisons with Intrinio or Massive (formerly Polygon.io)\n\n- [Alpha Vantage vs Intrinio](https://www.anchorterminal.com/compare/alpha-vantage-vs-intrinio.md)\n- [Alpha Vantage vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.md)\n- [Benzinga vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/benzinga-vs-massive.md)\n- [Databento vs Intrinio](https://www.anchorterminal.com/compare/databento-vs-intrinio.md)\n- [Databento vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/databento-vs-massive.md)\n- [Financial Datasets vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/financial-datasets-vs-massive.md)\n- [Financial Modeling Prep vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/financial-modeling-prep-vs-massive.md)\n- [Finnhub vs Intrinio](https://www.anchorterminal.com/compare/finnhub-vs-intrinio.md)\n- [Finnhub vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/finnhub-vs-massive.md)\n- [Intrinio vs Tiingo](https://www.anchorterminal.com/compare/intrinio-vs-tiingo.md)\n- [Intrinio vs Twelve Data](https://www.anchorterminal.com/compare/intrinio-vs-twelve-data.md)\n- [Massive (formerly Polygon.io) vs Tiingo](https://www.anchorterminal.com/compare/massive-vs-tiingo.md)\n- [Massive (formerly Polygon.io) vs Twelve Data](https://www.anchorterminal.com/compare/massive-vs-twelve-data.md)\n- [Financial Datasets vs Intrinio](https://www.anchorterminal.com/compare/financial-datasets-vs-intrinio.md)\n- [Financial Modeling Prep vs Intrinio](https://www.anchorterminal.com/compare/financial-modeling-prep-vs-intrinio.md)\n- [EODHD vs Intrinio](https://www.anchorterminal.com/compare/eodhd-vs-intrinio.md)\n- [EODHD vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/eodhd-vs-massive.md)\n- [Benzinga vs Intrinio](https://www.anchorterminal.com/compare/benzinga-vs-intrinio.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-04", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Intrinio vs Massive (formerly Polygon.io)", "url": "" } ], "description": "Massive scores 73.1 (BB) to Intrinio's 54.2 (C) for market prices. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Intrinio C 54.2", "Massive (formerly Polygon.io) BB 73.1", "scores" ], "h1": "Intrinio vs Massive (formerly Polygon.io)", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/intrinio-vs-massive", "published": "2026-10-01", "section": "tools", "title": "Intrinio vs Massive for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-11-03", "url": "https://www.anchorterminal.com/compare/intrinio-vs-massive" }, "tokens": { "markdown": 4650, "slim": 2880 }, "version": 1 }