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Ranked by measurement

Best stock market data API

13 tested · top 13 shown

2 more could only be measured on fewer than five frames, so they are not ranked here — a partial average is not comparable with a full one.

Ordered by a seven-frame production-readiness benchmark measured from each product's public surface — not popularity, pricing or feature count. Nobody pays to appear here and the order is never edited. How it is measured →
How this field scores
low 26median 76best 100
  1. 1
    Sugra
    Sugra provides a unified API for market, economics, and news data.
    Perf 98
    Acce 100
    Sec 100
    Priv 100
    Rel 100
    Std 100
    Disc 100
    sugra.systems · measured 2026-09-15
    7/7 frames
  2. 2
    3spread
    3spread provides a free API for accessing standardized SEC filing data.
    Perf 91
    Acce 100
    Sec 80
    Priv 75
    Rel 100
    Std 92
    Disc 100
    3spread.com · measured 2026-08-22
    7/7 frames
  3. 3
    한국주식데이터
    Free JSON API for Korean stock market data covering KOSPI, KOSDAQ, and KONEX.
    Sec 80
    Priv 75
    Rel 100
    Std 100
    Disc 100
    2 not assessed
    aikstockdata.com · measured 2026-09-09
    5/7 frames
  4. 4
    TickerLayer
    TickerLayer provides market data APIs for stocks, forex, crypto, indices, and perpetual futures.
    Perf 93
    Acce 97
    Sec 80
    Priv 70
    Rel 100
    Std 92
    Disc 100
    tickerlayer.com · measured 2026-09-18
    7/7 frames
  5. 5
    FinBridge
    FinBridge provides Korean and U.S. stock market data through a single API connection.
    Perf 81
    Acce 95
    Sec 100
    Priv 100
    Rel 100
    Std 86
    Disc 47
    gronox.kr · measured 2026-08-30
    7/7 frames
  6. 6
    Stock Market API & Financial Data Feed
    Stock market API providing financial data via REST, Python SDK, and Excel add-in.
    Perf 57
    Acce 82
    Sec 60
    Priv 100
    Rel 100
    Std 89
    Disc 50
    financialdata.net · measured 2026-09-26
    7/7 frames
  7. 7
    Financial Data API
    API providing real-time and historical financial data on public market assets.
    Perf 95
    Acce 100
    Sec 100
    Priv 0
    Rel 92
    Std 86
    Disc 57
    bluedoor.sh · measured 2026-09-14
    7/7 frames
  8. 8
    Clawby
    Clawby provides live market, on-chain, and social data for AI agents via a single API key.
    Perf 80
    Sec 45
    Priv 25
    Rel 100
    Std 75
    Disc 100
    1 not assessed
    openclawby.com · measured 2026-09-12
    6/7 frames
  9. 9
    xbrlmetrics
    S&P 500 financial fundamentals extracted from SEC EDGAR filings via XBRL.
    Perf 66
    Acce 96
    Sec 25
    Priv 25
    Rel 75
    Std 92
    Disc 45
    xbrlmetrics.com · measured 2026-09-05
    7/7 frames
  10. 10
    SEFCON
    API providing Korean stock fundamentals parsed directly from DART regulatory filings.
    Perf 70
    Acce 85
    Sec 45
    Priv 25
    Rel 67
    Std 85
    Disc 45
    api.sefcon.kr · measured 2026-08-16
    7/7 frames
  11. 11
    PairBook
    Stock and ETF correlation, covariance, and holdings overlap database with a free API.
    Perf 100
    Acce 100
    Sec 45
    Priv 25
    Rel 47
    Std 82
    Disc 15
    pairbook.io · measured 2026-09-27
    7/7 frames
  12. 12
    同花顺金融数据API
    同花顺金融数据 API，提供股票等金融数据的 REST 接口与 MCP 工具。
    Sec 25
    Priv 25
    Rel 67
    Std 75
    Disc 72
    2 not assessed
    fuyao.aicubes.cn · measured 2026-09-27
    5/7 frames
  13. 13
    ETFFlow by Yasin Özen
    API and MCP server for querying institutional spot BTC and ETH ETF net flow data.
    Sec 45
    Priv 25
    Rel 47
    Std 0
    Disc 15
    2 not assessed
    yasinozen35.github.io · measured 2026-09-11
    5/7 frames
What this does not say
This ranks how production-ready each product's public surface is — not how well it does its job. For stock market data api, that means it does not measure the quality of the work itself. Products whose sites block automated readers are left out rather than ranked last — we did not measure them, and bottom placement would claim something we never observed. Scores are floors: anything set at a CDN, a proxy or behind a login is invisible from the public surface.

All measured categories → · Browse the directory →