Best Free Stock APIs for
Real-Time, Historical & Python最佳免费股票 API
实时行情、历史数据与 Python 对比

Which free stock API offers real-time data without a credit card?哪个免费股票 API 无需信用卡即可提供实时数据？

Alpaca provides free real-time U.S. equity data from the IEX exchange.Alpaca 通过 IEX 交易所免费提供美国股票实时数据。 “Real-time” does not always mean the consolidated U.S. market: Alpaca's free IEX feed represents one venue, whereas SIP coverage is delayed or paid. For entitled consolidated SIP coverage, the client evaluation points to Alpha Vantage's premium U.S. market-data product rather than its 25-request public free key.需要注意，“实时”并不一定代表覆盖整个美国市场：Alpaca 的免费 IEX 行情仅来自单一交易所，免费账户只能使用延迟的 SIP 数据，最新 SIP 行情则需要付费。如果需要已获授权的 SIP 综合行情，客户测评指向 Alpha Vantage 的付费美国市场数据产品，而不是其每日 25 次请求的公开免费 Key。

What “Free Stock API” Means in 20262026 年“免费股票 API”到底意味着什么

Search results often mix permanent free tiers, time-limited credits, sandboxes and paid products with free documentation. Those models are not interchangeable. A useful comparison must identify what continues after signup, which datasets are included and what happens when the quota is exhausted.搜索结果经常把长期免费套餐、限时抵扣额度、沙盒，以及仅文档免费但数据付费的产品混在一起。这些模式并不等价。真正有用的比较必须说明注册后哪些权益会持续、包含哪些数据，以及额度耗尽后会发生什么。

• Permanent free tier:长期免费套餐： A recurring allowance with no fixed expiry, such as Alpha Vantage's 25 requests per day, Marketstack's 100 requests per month or FMP's 250 calls per day. Alpha Vantage's current support page also states that it offers unlimited daily requests for verified open-source or educational projects; applicants should confirm eligibility before relying on that allowance.这类额度没有固定到期日，并会按日或按月重置，例如 Alpha Vantage 每日 25 次、Marketstack 每月 100 次，以及 FMP 每日 250 次。Alpha Vantage 当前支持页面还表示，通过验证的开源或教育项目可以申请取消每日请求上限；在依赖这项权益之前，申请方仍应先确认自身资格。
• Free feed with narrower coverage:覆盖范围较窄的免费行情： Alpaca's Basic data access includes real-time IEX but not the full consolidated SIP feed. A feed can be live and still represent only part of the market.Alpaca Basic 提供实时 IEX 数据，但不包含完整 SIP 综合行情。数据可以是实时的，同时仍只代表市场的一部分。
• Signup credit:注册抵扣额度： Databento gives new accounts $125 in credits that expire after six months. That is valuable for evaluation, but it is not a permanent free message quota.Databento 向新账户提供 125 美元抵扣额度，并在六个月后到期。它适合用来评估数据，但不能视为长期免费的调用额度。
• Sandbox or delayed access:沙盒或延迟数据： Some plans expose sample symbols, end-of-day bars or delayed consolidated data. They are useful for integration tests, not a substitute for a licensed production feed.部分计划只开放示例标的、日终数据或延迟的综合行情。它们适合集成测试，但不能替代已获得生产使用授权的数据源。

6 Best Free Stock APIs Compared (Updated August 2026)6 款最佳免费股票 API 对比（2026 年 8 月更新）

The table separates recurring free allowances from signup credits and checks the dimensions that change an implementation decision: quota, feed freshness, payment requirement, permitted use and streaming access. The same six providers are evaluated under the same versioned standard. To inspect additional candidates after reviewing the client-tested set, browse financial-data providers in QVeris.下表将周期性免费额度与注册抵扣额度分开，并比较真正会影响接入决策的维度：配额、行情时效、付款要求、允许用途与流式访问。六家提供商均按照同一版标准进行评估。看完客户实测范围后，如需继续考察其他候选，可在 QVeris 中浏览金融数据提供商。

Limits can change without notice. Recheck the linked official plan and licensing pages before production procurement.套餐限制可能随时调整。正式采购并投入生产环境前，请重新核对文中链接的官方套餐与许可页面。

Summary judgment:综合判断： Alpha Vantage documents broad API coverage and says its premium U.S. market-data product provides consolidated SIP coverage, with an accessible paid upgrade path. Alpaca is compelling for no-cost real-time IEX access; FMP is strong for free EOD fundamentals; Massive is again relevant because Stocks Basic is free. Databento belongs in the “free credit” category, not the permanent free-tier category. Paid capabilities are discussed separately from the free-tier assessment.Alpha Vantage 提供广泛的 API 覆盖，并表示其付费美国市场数据产品可提供 SIP 综合行情，升级路径也较清晰。Alpaca 适合零成本获取实时 IEX 数据；FMP 在免费日终基本面数据方面具有优势；Massive 因 Stocks Basic 免费而重新具备参考价值。Databento 应归入“免费抵扣额度”，而不是永久免费层。本文会将付费能力与免费套餐评估分开讨论。

Best Free Stock API by Use Case按使用场景选择最佳免费股票 API

There is no universal winner. These recommendations map the most common long-tail searches to the constraint that actually decides the answer.不存在适合所有人的唯一答案。下面按照常见使用需求，说明哪些限制条件会真正改变选择结果。

Provider Deep Dive: Strengths, Limits and Hidden Trade-offs提供商深度解析：优势、限制与隐藏取舍

The quota is only one part of the decision. Coverage, adjustment methodology, market-feed scope and licensing usually become more important as a prototype moves toward production.配额只是决策的一部分。当原型逐步走向生产环境，市场覆盖、复权方法、行情源与使用许可通常更加重要。

Alpha Vantage — broad endpoints and a licensed upgrade pathAlpha Vantage：接口广泛，并提供明确的付费升级路径

Alpha Vantage covers stocks, ETFs, forex, crypto, macro indicators, fundamentals and technical indicators across more than 100 APIs. Its current support page states that the public free service is capped at 25 requests per day, with unlimited daily requests for verified open-source or educational projects. Alpha Vantage also states that it is a Nasdaq-licensed data provider and that its entitled premium U.S. market-data product provides consolidated SIP coverage with millisecond-level timestamps. Here, millisecond-level describes timestamp precision, not API network latency. This premium market-data entitlement is separate from the 25-request free key, so developers should confirm the applicable feed, timestamp semantics and usage rights before launch. For a plan-level breakdown, see Alpha Vantage Pricing: Complete Guide.Alpha Vantage 通过 100 多个 API 覆盖股票、ETF、外汇、加密货币、宏观指标、基本面与技术指标。其当前支持页面说明，公开免费服务每日限 25 次请求；通过验证的开源或教育项目则可以申请取消每日请求上限。Alpha Vantage 还表示自己是 Nasdaq 授权数据提供商，其已获得相应授权的付费美国市场数据产品可提供 SIP 综合行情和毫秒级时间戳。这里的“毫秒级”指时间戳精度，而不是 API 网络延迟。这项付费市场数据权限与每日 25 次请求的免费 Key 相互独立，因此开发者上线前仍应确认具体行情源、时间戳含义和使用权。套餐级详情可参阅 Alpha Vantage 定价完整指南。

Alpaca — real-time IEX is useful, but it is not SIPAlpaca：实时 IEX 很实用，但不等于 SIP

Alpaca's free market-data offering includes live IEX data and 15-minute-delayed SIP data. IEX is a single exchange and Alpaca's documentation describes it as suitable for testing or cases where precise consolidated pricing is not the priority. This distinction matters for spreads, liquidity, intraday highs and any system that assumes a national best bid and offer.Alpaca 免费市场数据包含实时 IEX 和延迟 15 分钟的 SIP 数据。IEX 是单一交易所，Alpaca 官方文档也将其定位为测试或不要求精确综合定价的场景。对于价差、流动性、日内高低点以及依赖全国最佳买卖价的系统，这一区别非常关键。

Financial Modeling Prep — useful EOD fundamentals with licensing boundariesFinancial Modeling Prep：适合日终基本面，但要注意许可边界

FMP Basic lists 250 calls per day, end-of-day access and a useful collection of company profile and reference endpoints. That makes it a practical fit for low-frequency screening, company research and daily portfolio reports. The free plan should not be treated as a blanket commercial license: customer display and redistribution can require a separate agreement, and a production team should verify the exact datasets and lookback available to its account.FMP Basic 提供每日 250 次调用、日终数据，以及较实用的公司档案与参考数据接口，适合低频筛选、公司研究和每日投资组合报告。但免费计划不能被视为通用商业许可：面向客户展示与再分发可能需要单独协议，生产团队还应核实账户实际可用的数据集与历史范围。

Marketstack — a small permanent allowance for occasional EOD workMarketstack：适合偶尔日终查询的小型长期免费额度

Marketstack's free plan lists 100 requests per month, end-of-day access and one year of history. It is useful for validating authentication, response fields and an occasional daily snapshot, but the monthly budget is too small for a regularly refreshed dashboard. Treat commercial rights as plan-specific and confirm them before using the data in a customer-facing product.Marketstack 免费计划提供每月 100 次请求、日终数据和一年历史，适合验证鉴权、响应字段与偶尔生成日度快照，但月度额度不足以支撑持续刷新的看板。商业使用权取决于具体套餐，面向客户使用前必须确认。

Massive — Polygon's free tier is back in the comparisonMassive：Polygon 的免费层重新值得纳入比较

Polygon.io now operates as Massive, and its current stock documentation lists Stocks Basic at $0 alongside paid Starter, Developer and Advanced plans. Basic is useful for reference data and historical/EOD exploration at a low request rate; live trades, quotes and full streaming coverage remain plan-dependent. Older comparisons that describe Polygon as paid-only are now stale.Polygon.io 现以 Massive 品牌运营，其当前股票文档将 Stocks Basic 标为 0 美元，并与 Starter、Developer 和 Advanced 付费计划并列。Basic 适合以较低请求速率探索参考数据和历史/日终数据；实时成交、报价和完整流式覆盖仍取决于套餐。将 Polygon 描述为“仅付费”的旧对比已经过时。

Databento — excellent evaluation credit, not free foreverDatabento：评估额度优秀，但并非永久免费

New Databento accounts receive $125 in credits shared by the team and expiring after six months. The credit can fund historical requests or offset a first subscription month. Payment information is required, and live data depends on subscription and exchange licensing. Databento is a strong institutional-data evaluation option, but it should not be presented as a permanent free real-time tier.Databento 新账户可获得团队共享的 125 美元额度，并在六个月后到期，可用于历史数据请求或抵扣首月订阅。注册需要付款信息，实时数据还取决于订阅和交易所许可。它很适合评估机构级数据，但不应被描述为永久免费的实时层。

Free Stock API Limits That Actually Matter真正重要的免费股票 API 限制

A daily quota rarely tells you whether an API will work. Model the full request path and the rights attached to the returned data.仅看每日配额，通常无法判断 API 是否适合实际项目。还应梳理完整的请求链路，并核对返回数据所附带的使用权限。

1. Requests per decision, not requests per symbol1. 计算每次决策所需请求，而不是只看每个标的

A single stock-research answer may require a quote, daily bars, fundamentals, earnings, news and peer data. A 20-symbol scan at six endpoints per symbol consumes 120 calls before retries. Batch endpoints, caching and precomputed snapshots can change the economics more than a headline rate limit.一次股票研究回答可能需要报价、日线、基本面、财报、新闻和同行数据。20 个标的、每个标的调用六个接口，在重试前就会消耗 120 次调用。批量接口、缓存和预计算快照对成本的影响，往往大于表面的速率限制。

2. Feed coverage: IEX, SIP or one exchange2. 行情覆盖：IEX、SIP 还是单一交易所

“Real-time” describes latency, not completeness. A live single-venue feed can differ from the consolidated market in last price, volume, bid/ask and intraday range. Document the feed name in every downstream record so analysts know what they are comparing.“实时”描述的是延迟，而不是完整性。实时单一交易所行情在最新价、成交量、买卖价和日内区间上都可能与综合市场不同。应在每条下游记录中标明行情源名称，让分析人员知道比较的是什么。

3. Historical depth and adjustment policy3. 历史深度与复权策略

Backtests need more than OHLCV. Verify split and dividend adjustments, delisted securities, ticker changes, survivorship bias, time zones and whether the free plan truncates history. Two APIs can return valid but incompatible series for the same ticker.回测需要的不只是 OHLCV。应核对拆股和分红复权、退市证券、代码变更、幸存者偏差、时区，以及免费计划是否截断历史。两个 API 针对同一代码返回的数据都可能各自正确，却无法直接比较或合并。

4. Display, non-display and redistribution rights4. 展示、非展示与再分发权利

Personal analysis, automated trading, a public dashboard and reselling derived signals can fall under different licenses. Before launch, record the provider, dataset, entitlement, user type and permitted output. Do not infer commercial rights from the existence of a free API key.个人分析、自动交易、公开看板以及出售衍生信号可能对应不同许可。上线前应记录提供商、数据集、权限、用户类型，以及允许向最终用户展示或输出的内容。不能因为存在免费 API 密钥，就推断拥有商业使用权。

5. Failure behavior and quota recovery5. 失败行为与配额恢复

Test HTTP 429 handling, retry headers, daily reset time, partial responses, stale-cache behavior and WebSocket reconnection. A production agent should surface the data timestamp and provider error instead of silently turning missing values into a confident answer.应测试 HTTP 429、重试响应头、每日配额重置时间、部分响应、过期缓存行为和 WebSocket 重连。生产环境中的 AI Agent 应明确显示数据时间戳和提供商错误，而不是把缺失值悄悄包装成确定答案。

How to Choose a Free Stock API for Your Project如何为项目选择免费股票 API

Match the provider to the job the application performs today, then define the trigger that would force a different feed or paid plan.先根据应用当前要完成的任务匹配提供商，再定义什么条件会触发切换数据源或升级付费计划。

Practical rule:实用原则： Build a one-day request budget before integrating: symbols × endpoints × refreshes × retries. If the result uses more than 60% of the free allowance in normal traffic, design caching, batching and an upgrade path before launch.接入前先计算一天的请求预算：标的数 × 接口数 × 刷新次数 × 重试次数。若正常流量已消耗免费额度的 60% 以上，应在上线前设计缓存、批处理与升级路径。

When a Free Stock API Stops Being the Right Choice什么时候免费股票 API 不再是正确选择

The upgrade trigger should be an engineering or licensing requirement, not a calendar date. A free plan can remain adequate for a daily research notebook and be unsuitable on day one for a customer-facing quote product.是否升级，应由工程需求或许可要求决定，而不是由使用时间决定。免费计划或许能长期满足每日运行一次的研究笔记本，却可能从第一天起就不适合面向客户的报价产品。

Upgrade when one of these conditions becomes true当以下任一条件成立时考虑升级

• Normal traffic regularly consumes more than 60–70% of the quota, leaving no room for retries or market events.正常流量经常消耗 60%–70% 以上配额，无法为重试或市场突发事件留出空间。
• A delayed or single-venue feed changes the product's answer, alert or execution decision.延迟或单一交易所行情会改变产品的回答、提醒或执行决策。
• The product needs display, redistribution, derived-data or professional-user rights absent from the free plan.产品需要免费计划不包含的展示、再分发、衍生数据或专业用户权限。
• Historical depth, corporate actions or delisted-symbol coverage is insufficient for reproducible research.历史深度、公司行动或退市股票覆盖不足以支持可复现研究。
• The provider offers no SLA or support path for a failure that would affect paying users.提供商没有 SLA 或支持渠道，而故障会影响付费用户。

Compare total cost, not the first paid-plan price比较总成本，而不是最低付费套餐价格

At the August 3, 2026 review, entry points differed substantially: Alpha Vantage premium plans started at $49.99/month, Marketstack Basic at about $9.99/month, FMP Starter from $22/month when billed annually, Massive Stocks Starter at $29/month, while Databento combined subscriptions, usage charges and exchange licensing. These are dated snapshots, not permanent prices. Not all paid plans are equivalent: the lowest sticker price may omit the feed, history or usage rights your application needs.截至 2026 年 8 月 3 日复核时，各家的付费起点差异明显：Alpha Vantage 付费套餐从每月 49.99 美元起，Marketstack Basic 约为每月 9.99 美元，FMP Starter 年付时从每月 22 美元起，Massive Stocks Starter 为每月 29 美元；Databento 则同时涉及订阅费、按量计费和交易所许可。这些价格仅代表截至核验日期的情况，并非长期固定价格。不同付费套餐也不能只按标价直接比较：最低价格可能并不包含应用真正需要的行情源、历史深度或使用权。

Reproducible free stock API benchmark protocol可复现的免费股票 API 测评方法

Plan pages describe entitlements; they do not prove how an endpoint behaves in a real workflow. For this evaluation, applicable response checks were run twice to confirm response shape and compare returned values. That repetition improves confidence in the observation, but it does not establish a latency SLA, long-term reliability ranking or public free entitlement. Teams repeating the comparison should use the same bounded test and retain the raw responses.套餐页面只能说明使用权限，不能证明接口在真实工作流中的表现。本次测评对能够执行的接口检查均重复两次，用于确认响应结构并比较返回值。重复检查可以提高对当次观察的信心，但不能据此推导延迟 SLA、长期可靠性排名，或认定某项能力属于公开免费套餐。后续复测应使用同一套受控测试并保存原始响应。

Download the machine-readable August 3, 2026 provider evidence snapshot. It records source URLs and verification status; it does not claim unrun performance measurements.下载机器可读的 2026 年 8 月 3 日提供商证据快照。文件记录来源 URL 与核验状态，不包含未实际执行的性能数据。

Free Stock API Python Example: Test Before You Integrate免费股票 API Python 示例：接入前先测试

The safest first script does more than print a price. It records the provider, response time, returned timestamp and rate-limit behavior. The example below uses Alpha Vantage's documented demo key so the request can be reproduced without exposing a private credential.第一段可安全运行的测试脚本不应只打印价格，还应记录提供商、响应时间、数据时间戳和限速行为。下面使用 Alpha Vantage 官方文档中的 demo 密钥，因此无需暴露私人凭证即可复现请求。

import time
import requests

url = "https://www.alphavantage.co/query"
params = {
    "function": "TIME_SERIES_DAILY",
    "symbol": "IBM",
    "apikey": "demo",
}

started = time.perf_counter()
response = requests.get(url, params=params, timeout=15)
latency_ms = round((time.perf_counter() - started) * 1000)
response.raise_for_status()
payload = response.json()

print({
    "provider": "Alpha Vantage",
    "status": response.status_code,
    "latency_ms": latency_ms,
    "last_refreshed": payload.get("Meta Data", {}).get("3. Last Refreshed"),
    "rate_limit_note": payload.get("Note"),
})

Free Stock API FAQ免费股票 API 常见问题

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