How to Choose a Free Stock Market Data Feed
for Your Application如何选择免费股票市场数据源
并可靠构建应用
Compare free feeds for quotes, WebSocket streams, OHLCV, and CSV, then verify latency, coverage, limits, adjustments, and usage rights.
比较行情、WebSocket 数据流、OHLCV 与 CSV，
并在接入前验证延迟、覆盖、限额、复权与使用权限。
Quick Summary快速摘要
Most free stock data APIs start with symbol search, delayed quotes, daily OHLCV bars, and limited company metadata.
Compare requests per minute and per day, symbols per call, history depth, exchange coverage, and allowed concurrency.
Verify venues, listing types, premarket and after-hours sessions, halts, auctions, condition codes, and corporate-action reference data.
Monitor universe completeness, feed age, sequence gaps, open and close events, and post-session corrections—not only whether the socket is connected.
多数免费股票数据源会先提供股票代码搜索、延迟行情、日线 OHLCV 和有限的公司元数据。
比较每分钟和每日请求数、单次代码数量、历史深度、交易所覆盖与并发限制。
还要核对交易场所、上市证券类型、盘前盘后、停牌、集合竞价、成交条件代码和公司行动参考数据。
应监控股票池完整度、数据年龄、序号缺口、开收盘事件及盘后修订，而不是只看连接是否在线。
Define your requirements before comparing data feeds比较数据源前，先定义市场数据需求
Start with the application contract, not a provider name.
先定义应用的数据需求，而不是先选供应商。
The phrase free stock data covers several products that behave very differently. A quote endpoint may return only the latest traded price, while an end-of-day dataset can provide years of bars but no intraday updates. Fundamental feeds often follow company reporting cycles, and regulatory filings may arrive as documents rather than tidy rows.
“免费股票数据”并不是单一产品。行情接口可能只返回最新成交价，日线数据集可以覆盖多年，却没有盘中更新；基本面数据通常跟随公司财报周期，监管申报则可能以文档而非整齐表格提供。
For research, price fields alone are rarely enough.
对于研究任务，只有价格字段通常不够。
Last price, change, bid/ask, session status, and timestamp. Confirm whether values are real-time, delayed, indicative, or end-of-day.
Open, high, low, close, and volume by interval. For return calculations, verify splits, dividends, and adjusted-close methodology.
A national best bid and offer, consolidated last sale, and one venue’s quote are different products. Preserve venue and scope so the application does not compare unlike values.
Maintain active symbols, listing venue, security type, currency, status, symbol changes, and effective dates. A stream cannot repair an incomplete subscription universe.
Handle premarket, core, after-hours, halts, auctions, and early closes explicitly. Silence can mean a closed market, a halted symbol, or a broken feed.
最新价、涨跌、买卖价、交易状态和时间戳。务必确认数据是实时、延迟、指示性还是收盘数据。
按周期提供开高低收和成交量。计算收益率前，要核对拆股、分红与复权收盘价的方法。
全国最佳买卖价、合并最新成交与单一场所报价是不同产品。必须保留场所和覆盖口径，避免应用比较并不相同的数值。
维护有效代码、上市场所、证券类型、币种、状态、代码变化和生效日期。订阅股票池本身不完整，流式消息也无法补救。
盘前、正常交易、盘后、停牌、竞价和提前收盘都应显式处理。长期无消息可能是市场休市、个股停牌，也可能是数据源故障。
How free stock market data feed options compare免费股票市场数据源如何比较
REST APIs are the easiest place to start because they work with ordinary HTTPS clients and return predictable JSON. WebSocket feeds support streaming updates but usually have stricter entitlements. Broker APIs add account and execution context, while bulk-download endpoints are efficient for backfills and repeatable research. A useful free plan should match both your data need and your update pattern.
REST API 最容易上手，可通过普通 HTTPS 客户端调用并返回结构化 JSON。WebSocket 适合流式更新，但授权通常更严格；券商 API 能提供账户和交易上下文；批量下载端点则适合历史回填与可重复研究。免费套餐应同时匹配你的数据需求和更新模式。
| Source来源 | What it offers提供内容 | Best for适合场景 | Watch for注意事项 |
|---|---|---|---|
| REST APIREST 请求式接口 | Quotes, candles, profiles, and fundamentals over HTTPS.通过 HTTPS 提供行情、K 线、公司资料与基本面。 | Apps, agents, prototypes, and scheduled jobs.应用、Agent、原型与定时任务。 | Rate limits, pagination, and delayed prices.调用限额、分页与行情延迟。 |
| WebSocket APIWebSocket 流式接口 | Push-based trades, quotes, or aggregate updates.推送逐笔成交、行情或聚合更新。 | Live dashboards and event-driven systems.实时看板与事件驱动系统。 | Connection limits and market entitlements.连接数限制与市场数据使用权限。 |
| Broker API券商接口 | Account-linked data plus portfolio context.账户关联数据与投资组合上下文。 | Personal monitoring and execution workflows.个人监控与交易执行流程。 | An eligible funded account may be required.可能需要符合条件且已入金的账户。 |
| Bulk or CSV API批量或 CSV 接口 | Large historical files for download and archival.用于下载与归档的大型历史文件。 | Backfills, notebooks, and backtests.历史回填、Notebook 与回测。 | Less current and more expensive to refresh.时效较低，刷新成本较高。 |
Compare sources with the same small test set rather than relying on feature lists. Request a liquid stock, a thinly traded security, a symbol that changed, and a date containing a split or dividend. Compare timestamps, missing records, precision, adjustment behavior, and error messages.
不要只看功能清单，最好用同一组小样本横向测试：选择一只高流动性股票、一只成交稀疏的证券、一个曾更换代码的标的，以及包含拆股或分红的日期。对比时间戳、缺失记录、数值精度、复权方式和错误信息。
Before the open, compare expected and acknowledged subscriptions by venue and security type. Alert on missing groups rather than discovering gaps after users ask for a symbol.
Use event time, receive time, and session state. Highly liquid and thinly traded symbols need different silence thresholds.
Verify official open and close conditions, late prints, corrected trades, and final bar updates. Do not assume the first or last received trade is official.
开盘前按场所和证券类型比较预期订阅与已确认订阅，对缺失分组直接告警，不要等用户查询某只股票时才发现漏订。
结合事件时间、接收时间和交易状态判断陈旧程度。高流动性股票与冷门股票不能使用同一个静默阈值。
检查官方开收盘条件、迟到成交、更正消息和最终 K 线修订，不能把第一笔或最后一笔收到的成交直接当作官方价格。
Use QVeris to find stock data capabilities使用 QVeris 查找股票数据接口
There is no single verified QVeris result for every whole-market feed. Use the QVeris documentation to understand callable capabilities and the Playground to inspect candidates before validating market-wide coverage directly with the provider.
目前没有一个经过核实的 QVeris 结果，可以覆盖所有全市场数据源。可以先阅读 QVeris 文档了解可调用能力，再到 Playground 检查候选项，最后向供应商直接核实全市场覆盖。
FAQ常见问题
Yes, several services offer free keys, but quotas, exchanges, history, delays, and permitted uses vary. Compare the full plan contract, not only the price.
Some do for selected venues, while others provide delayed or end-of-day values. Check the exchange entitlement and response timestamp.
No. It can be current for that venue while missing trades and quotes elsewhere. Label venue scope and avoid presenting it as consolidated coverage.
Compare the provider’s active universe with an independent symbol master, then test each venue, session, security type, halt, and corporate-action transition.
有些服务提供免费密钥，但配额、市场、历史深度、延迟与使用权各不相同，应比较完整套餐条款。
部分服务只对特定市场提供实时数据，其他则是延迟或收盘数据，应检查交易所授权与响应时间戳。
不等于。它在该场所内可能是实时的，但会遗漏其他场所的成交和报价。页面应标明覆盖范围，不能把它包装成合并行情。
把供应商有效股票池与独立代码主表对比，并逐项测试场所、交易时段、证券类型、停牌和公司行动切换。
References and next steps参考资料与下一步
Alpaca Market Data
Finnhub API documentation
Twelve Data API documentation
QVeris documentation
QVeris Playground
Alpaca 市场数据
Finnhub API 文档
Twelve Data API 文档
QVeris 文档
QVeris Playground