# Best data provider APIs for AI agents (slim)

> CoinGecko x402 API (BB), Massive (formerly Polygon.io) (B) and Wikimedia REST API (B) lead the 9 ranked data provider APIs. Picks by need, strengths, weaknesses and prices from the Anchor benchmark.

- Full: https://www.anchorterminal.com/best/data-providers/index.md (~4,950 tokens) · this version ~1,330 tokens · JSON https://www.anchorterminal.com/best/data-providers/index.json · canonical https://www.anchorterminal.com/best/data-providers/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

All 9 ranked data provider APIs on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.

- Ranked: 9 · agent-ready (BB or better): 1 · accept x402: 2 · hosted endpoints: 9
- Full ranked table: https://www.anchorterminal.com/categories/data-providers.md
- Head-to-head comparisons: https://www.anchorterminal.com/compare/data-providers/index.md (31)
- Methodology: https://www.anchorterminal.com/benchmark/index.md

## The shortlist

| # | Tool | Grade | Score | Best for | Price | Where |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | [CoinGecko x402 API](https://www.anchorterminal.com/tools/coingecko-x402-api.md) | BB | 71.7 | An agent that needs a spot or on-chain token price now and has a wallet but no account. | $0.01 / call | hosted |
| 2 | [Massive (formerly Polygon.io)](https://www.anchorterminal.com/tools/massive.md) | B | 69.8 | Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402. | $0.01 / call | hosted |
| 3 | [Wikimedia REST API](https://www.anchorterminal.com/tools/wikimedia.md) | B | 66.5 | Grounding an agent in general knowledge with citations and history. | Free | hosted |
| 4 | [Open-Meteo](https://www.anchorterminal.com/tools/open-meteo.md) | B | 63.4 | Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup. | Freemium | hosted |
| 5 | [Companies House API](https://www.anchorterminal.com/tools/companies-house.md) | D | 49.3 | UK company lookups, KYC, officer and PSC checks where the statutory source matters. | Free | hosted |
| 6 | [CoinDesk Data API](https://www.anchorterminal.com/tools/coindesk-data-api.md) | D | 46.6 | Institutional crypto work that needs derivatives, order books, regulated reference rates or deep history, with a human buying the plan. | Paid | hosted |
| 7 | [FRED API](https://www.anchorterminal.com/tools/fred.md) | E | 42.7 | Looking up US and international macroeconomic series, their metadata and their revision history in a live session. | Free | hosted |
| 8 | [Alpha Vantage](https://www.anchorterminal.com/tools/alpha-vantage.md) | E | 41.3 | A personal research or analysis agent that wants many asset classes, fundamentals, indicators and news sentiment from one key at a flat price. | $49.99 / mo | hosted and local |
| 9 | [SEC EDGAR APIs](https://www.anchorterminal.com/tools/sec-edgar.md) | E | 40.8 | Reading a US-listed company's filing history and its reported financial figures from the primary source, with free reuse. | Free | hosted |

## Picks by need

- Highest score overall: [CoinGecko x402 API](https://www.anchorterminal.com/tools/coingecko-x402-api.md), BB, 71.7/100 on the benchmark. Also [Massive (formerly Polygon.io)](https://www.anchorterminal.com/tools/massive.md), B, 69.8/100.
- Schema & documentation: [Massive (formerly Polygon.io)](https://www.anchorterminal.com/tools/massive.md), 89/100 on schema & documentation, against 72 for the overall leader.
- Agent ergonomics: [Open-Meteo](https://www.anchorterminal.com/tools/open-meteo.md), 85/100 on agent ergonomics, against 61 for the overall leader.
- Security & auth: [Wikimedia REST API](https://www.anchorterminal.com/tools/wikimedia.md), 66/100 on security & auth, against 60 for the overall leader.
- Maintenance & community: [Open-Meteo](https://www.anchorterminal.com/tools/open-meteo.md), 90/100 on maintenance & community, against 82 for the overall leader.
- Transparency & trust: [Wikimedia REST API](https://www.anchorterminal.com/tools/wikimedia.md), 76/100 on transparency & trust, against 73 for the overall leader.
- Paying per call with no account (x402): [CoinGecko x402 API](https://www.anchorterminal.com/tools/coingecko-x402-api.md), accepts x402, $0.01 a call. Also [Massive (formerly Polygon.io)](https://www.anchorterminal.com/tools/massive.md), accepts x402, $0.01 a call.
- A hosted MCP endpoint: [Massive (formerly Polygon.io)](https://www.anchorterminal.com/tools/massive.md), remote MCP server, nothing to install.

## How to choose

- Coverage and history depth: Check how far back the data goes and which markets, companies or regions it covers, because gaps in history break any backtest or trend an agent builds.
- Real-time or delayed data: Confirm whether prices and figures are real-time, delayed or end-of-day, since an agent acting on a stale figure may report values that no longer hold.
- Revisions and restatements: Check whether figures get revised after publication and whether old versions stay available, so an agent can tell what was known at the time it made a decision.
- Licence for agent use: Read the licence for redistribution and storage, since data licensed for viewing may not let an agent cache, resell or pass figures on.

Each listing's verdict, strengths and weaknesses: https://www.anchorterminal.com/best/data-providers/index.md