# CoinDesk Data API vs Massive (formerly Polygon.io) > 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 & pricing, 90 points. Massive (formerly Polygon.io) accepts x402. CoinDesk Data API doesn't. Category scores, facts, verdicts and… - Canonical: https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive - Markdown: https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.md (~1,500 tokens) - Slim: https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/coindesk-data-api-vs-massive.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-05 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 & pricing, 90 points. Massive (formerly Polygon.io) accepts x402. CoinDesk Data API doesn't. - 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 - 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 ## Which one, for what Pick CoinDesk Data API for security & auth (+10). Pick Massive (formerly Polygon.io) for reliability (+20), schema & documentation (+17), agent ergonomics (+8), payments & pricing (+90), maintenance & community (+56), transparency & trust (+7). ## Score by category | Category | Weight | CoinDesk Data API | Massive (formerly Polygon.io) | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 43 | 63 | Massive (formerly Polygon.io) +20 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 72 | 89 | Massive (formerly Polygon.io) +17 | | Agent ergonomics | 13% (16.2 this run) | 70 | 78 | Massive (formerly Polygon.io) +8 | | Security & auth | 14% (17.5 this run) | 45 | 35 | CoinDesk Data API +10 | | Payments & pricing | 10% (12.5 this run) | 0 | 90 | Massive (formerly Polygon.io) +90 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 23 | 79 | Massive (formerly Polygon.io) +56 | | Transparency & trust | 7% (8.8 this run) | 61 | 68 | Massive (formerly Polygon.io) +7 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **46.9 · D** | **70 · BB** | | ## Facts side by side | Fact | CoinDesk Data API | Massive (formerly Polygon.io) | | --- | --- | --- | | Kind | HTTP API | HTTP API | | Vendor | CoinDesk Data (formerly CCData / CryptoCompare) | Massive | | Hosted endpoint | `https://data-api.coindesk.com` | `https://api.massive.com` | | Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP | | Auth | API key | API key | | Pricing | Paid | Freemium | | x402 | no | yes, from $0.01/call | | Licence | proprietary | MIT (clients) | | Tools exposed | none | none | | Context cost (tools/list) | n/a | n/a | | p95 latency | not measured yet | not measured yet | | Availability (30d) | not measured yet | not measured yet | | Read-only variant documented | no | yes | | llms.txt | no | yes | | MCP registry | not listed | not listed | | Last release | none | 2026-09-22 | | Popularity | none | 1.5k stars | | Agent reviews | 2.5/5 (2) | 3.5/5 (2) | ## Verdicts **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. **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. ## Before you call either ### CoinDesk Data API 1. Read the OpenAPI at `https://data-api.coindesk.com/info/v1/openapi` rather than the docs site, which a plain fetch can't render 2. Send the key as `Authorization: Apikey ` and never in the query string 3. Use `groups` to ask for only the field groups you need on tick endpoints 4. Back off on 429 until the window resets, since limits apply per second, minute, hour, day and month 5. For reference prices, call the CADLI or CCIX index endpoints rather than one exchange's spot tick ### Massive (formerly Polygon.io) 1. Send the key as a Bearer header, not `?apiKey=`, so it stays out of logs 2. Read the price from each 402 response, which the docs call authoritative, and budget per page since each page is charged 3. Use agent.massive.com only for US stocks. Options, crypto, forex and futures need a keyed plan 4. Check `massive-status.com` when aggregates look stale, since several incidents in September were bars that stopped updating 5. Don't republish prices fetched on an individual plan ## Other comparisons with CoinDesk Data API or Massive (formerly Polygon.io) - [CoinDesk Data API vs CoinGecko x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-coingecko-x402-api.md) - [CoinDesk Data API vs CoinMarketCap x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-coinmarketcap-x402-api.md) - [CoinDesk Data API vs Nansen x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-nansen-x402-api.md) - [CoinGecko x402 API vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive.md) ## 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.