Free Forex Quotes API
Selection and Integration Guide免费外汇报价 API
选择、验证与接入指南
Use a free forex quotes API to retrieve current bid and ask prices, then verify timestamps, sources, limits, and delivery before your app relies on the feed.
用免费外汇报价 API 获取货币对的当前买卖价，并在应用依赖行情前验证时间戳、数据源、调用限额与传输方式。
Free forex quotes API: what to look for first免费外汇报价 API：先检查哪些条件
A useful free FX API exposes a documented HTTPS endpoint, identifies the base and quote currencies, returns a source timestamp, and explains its source, update frequency, quota, authentication, license, and error behavior. “Free” can mean a public endpoint, a limited plan, or a trial, so verify the current documentation before building a dependency.
可用的免费外汇接口应提供有文档的 HTTPS 端点，明确基准币与目标币，返回来源时间，并说明数据来源、更新频率、额度、认证、许可和错误结构。“免费”可能指公共端点、限额套餐或试用，因此建立依赖前必须核对最新文档。
| Need需求 | Verify检查 | Common mismatch常见错配 |
|---|---|---|
| Current conversion当前换算 | Latest timestamp and base rules最新时间与基准币规则 | Daily reference rate presented as live把日频参考价当成实时价 |
| App or dashboard应用或看板 | Quota, CORS, caching, status page额度、CORS、缓存与状态页 | Trial mistaken for a permanent free tier把试用当成长期免费层 |
| Trading use交易用途 | Bid/ask, latency, venue, license买卖价、延迟、场所与许可 | Midpoint used as an executable quote把中间价当成可成交报价 |
Define the quote contract before comparing forex APIs比较外汇 API 前先定义报价契约
Do you need bid and ask, or only a reference rate?需要买卖双边报价，还是只需要参考汇率？
A forex quote is not merely a currency conversion number. Trading, spread monitoring, valuation, and best-execution research require an explicit bid, ask, quote timestamp, and source or venue. A single midpoint can support display and rough valuation, but it cannot show the cost of crossing the spread. Write this distinction into the acceptance test before comparing providers.
外汇报价并不只是一个换算数字。交易分析、点差监控、估值和最优执行研究需要明确的买价、卖价、报价时间以及来源或交易场所。单一中间价可用于展示和粗略估值，却无法反映跨越买卖价差的成本。比较供应商前，应把这一差异写入验收标准。
Pair direction, quote precision, and market convention币种对方向、报价精度与市场惯例
For EUR/USD, the bid normally describes how many dollars a dealer pays for one euro and the ask how many dollars it charges. An inverted response changes both the numerical value and which side is bid or ask. Preserve the provider symbol, normalized base and quote currencies, displayed precision, pip size, and any direct-versus-derived flag rather than storing an unlabeled rate.
以 EUR/USD 为例，买价通常表示交易方买入一欧元愿意支付多少美元，卖价表示卖出一欧元要求多少美元。若接口返回的是倒数方向，数值和买卖方向都会变化。应保存供应商原始代码、标准化后的基准币和计价币、显示精度、点值以及直接报价或推导报价标记，而不是只存一个没有语义的 rate。
Snapshot quotes versus an ongoing quote stream单次报价快照与持续报价流
This page is about the meaning and validation of a quote, regardless of transport. A REST endpoint may be enough for periodic spread checks; a WebSocket feed is better for stateful monitoring. If your main question is reconnect logic, subscriptions, heartbeat messages, or tick latency, use the dedicated live-forex-data guide instead of treating those operational concerns as quote semantics.
本页关注报价本身的含义与校验，与传输方式无关。周期性检查点差时 REST 快照可能已经够用；持续监控状态则更适合 WebSocket。若你的核心问题是重连、订阅、心跳或逐笔延迟，应转到实时外汇数据指南，不要把传输层问题和报价语义混在一起。
Compare forex quote APIs by market meaning, not endpoint count按市场含义比较外汇报价 API，而不是比端点数量
| Criterion维度 | Question问题 | Evidence to keep保留证据 |
|---|---|---|
| Quote sides报价方向 | Are bid and ask native fields or reconstructed from a midpoint?买价和卖价是原生字段，还是由中间价推算？ | Raw payload and field definitions原始响应与字段定义 |
| Spread点差 | Is the spread plausible for the pair, venue, and session?点差是否符合该币种对、场所和交易时段？ | Bid, ask, midpoint, and calculated spread买价、卖价、中间价与计算点差 |
| Provenance报价来源 | Which contributor, broker, venue, or aggregation method produced it?报价来自哪个贡献方、经纪商、场所或聚合方法？ | Provider, venue, contributor, methodology供应商、场所、贡献方与方法说明 |
| Quote age报价年龄 | How old was the market observation when your service received it?服务收到数据时，市场观测已经过去多久？ | Source, receipt, and processing timestamps来源、接收与处理时间戳 |
| Entitlement数据授权 | May quotes be displayed, cached, or redistributed to customers?报价能否展示、缓存或再分发给客户？ | Market-data agreement and display terms市场数据协议与展示条款 |
Why a free midpoint API is not automatically a forex quote API为什么免费的中间价接口不一定是外汇报价 API
Many free endpoints return one indicative rate per pair and call it a quote. That can be useful, but it cannot support spread analysis unless the provider documents how bid and ask are formed. Classify those endpoints as reference-rate services and reserve “quote feed” for responses with enough provenance and side information to explain what a buyer and seller would observe.
不少免费端点每个币种对只返回一个指示性汇率，也把它称为 quote。这样的数据并非无用，但如果供应商没有说明买卖价如何形成，就不能用于点差分析。更稳妥的做法是把它归为参考汇率服务；只有响应包含足够的来源信息和买卖方向，才能称为报价数据源。
Understand how a forex quote is formed理解一条外汇报价是怎样形成的
Unlike an exchange-traded stock, spot FX has no single consolidated tape. A bank, broker, electronic venue, retail platform, and multi-source aggregator can all publish valid but different prices at the same instant. The difference may reflect contributor inventory, client tier, session liquidity, aggregation rules, or delay rather than a bad API. A production comparison therefore evaluates quote lineage before numerical closeness.
与交易所股票不同，现货外汇没有唯一的统一行情带。同一时刻，银行、经纪商、电子交易场所、零售平台和多来源聚合商都可能给出有效但不同的价格。这些差异可能来自报价方库存、客户层级、交易时段流动性、聚合规则或延迟，并不一定意味着 API 错误。因此，生产级比较应先评估报价来源链，再比较数值是否接近。
| Source type来源类型 | What it represents代表什么 | Suitable uses适合场景 | Watch for注意事项 |
|---|---|---|---|
| Single-dealer quote单一交易方报价 | Prices offered by one bank or broker某一家银行或经纪商给出的价格 | Client-specific execution analysis面向特定客户的执行分析 | Customer tier and non-transferable rights客户层级与不可转授的权利 |
| Venue quote交易场所报价 | Best visible prices within one venue一个交易场所内可见的最优价格 | Venue monitoring and microstructure research场所监控与微观结构研究 | Depth, participant access, and venue hours深度、参与者权限与场所时段 |
| Composite quote综合报价 | A normalized bid and ask across contributors跨多个贡献方标准化后的买卖价 | Cross-provider monitoring and valuation跨供应商监控与估值 | Contributor set and stale-source handling贡献方集合与陈旧来源处理 |
| Indicative quote指示性报价 | A non-binding market indication不具有成交约束力的市场指示 | Dashboards and directional context看板与方向判断 | Not executable and may omit the spread不可成交，且可能不含点差 |
Store both sides and derive the midpoint explicitly同时保存买卖两侧，并显式计算中间价
When bid and ask are available, store both unchanged and calculate (bid + ask) / 2 as a derived field. Also record absolute spread and spread in pips or basis points. This makes later analysis reproducible and prevents a transformed midpoint from being confused with the provider’s original observation.
接口同时提供买价和卖价时，应原样保存两者，并把 (bid + ask) / 2 作为推导字段计算。还应记录绝对点差，以及用点数或基点表示的相对点差。这样既能复现后续分析，也能避免把加工后的中间价误认为供应商原始观测。
Worked inversion example: reciprocal values must swap sides倒数报价示例：取倒数时必须交换买卖方向
Assume a source quotes EUR/USD at 1.08492 bid and 1.08496 ask. To express the same market as USD/EUR, the inverse bid is 1 ÷ 1.08496 = 0.921693 and the inverse ask is 1 ÷ 1.08492 = 0.921727. The original ask becomes the denominator of the inverse bid because someone selling USD and receiving EUR crosses the opposite side of the original market. Taking 1 ÷ bid as the new bid and 1 ÷ ask as the new ask would produce 0.921727 × 0.921693—a crossed, impossible quote.
Preserve the original pair and sides, perform the inversion with decimal arithmetic at higher precision than the display format, and round only at the final presentation boundary. Record the derived flag and source timestamp so the inverse cannot be mistaken for a separately observed USD/EUR market. The same discipline applies when composing cross rates: bid and ask must be derived side by side from time-aligned source quotes, not from one rounded midpoint.
倒数报价示例：取倒数时必须交换买卖方向
假设来源给出的 EUR/USD 买价为 1.08492、卖价为 1.08496。把同一市场改写为 USD/EUR 时，新的买价应为 1 ÷ 1.08496 = 0.921693，新的卖价应为 1 ÷ 1.08492 = 0.921727。原报价的卖价之所以成为新买价的分母，是因为卖出美元、换入欧元时跨越的是原市场的另一侧。如果把 1 ÷ 原买价 直接当作新买价、把 1 ÷ 原卖价 当作新卖价，就会得到 0.921727 × 0.921693 的买卖倒挂，这是不可能成交的报价。
系统应保留原始货币对及其买卖方向，使用高于最终展示精度的十进制运算完成倒数换算，只在展示边界进行取整；同时记录“推导报价”标记和来源时间，避免用户把它误认为独立观测到的 USD/EUR 市场。计算交叉汇率时也应遵循同一原则：用时间对齐的来源报价分别推导买价和卖价，不能只对一个已经取整的中间价做换算。
Detect crossed, locked, stale, and one-sided quotes识别倒挂、锁定、陈旧与单边报价
Reject or quarantine a quote when bid exceeds ask unless the feed documents an auction or special state. Flag zero spreads, missing sides, timestamps that move backward, and values unchanged beyond a pair-specific threshold. These checks are more meaningful for a quote API than simply asking whether the JSON parsed successfully.
若买价高于卖价，且数据源没有说明处于竞价或特殊状态，应拒绝或隔离该报价。还要标记零点差、缺失一侧、时间戳倒退，以及超过币种对阈值仍不变化的报价。对报价 API 来说，这些检查比“JSON 能否解析”更有意义。
Test a free forex quotes API JSON response测试免费外汇报价 API 的 JSON 响应
Provider-neutral latest-rates request与供应商无关的最新汇率请求
GET /latest?base=USD&symbols=EUR,JPY
Accept: application/json
{
"base": "USD",
"timestamp": "SOURCE_TIMESTAMP",
"rates": {
"EUR": "RATE_VALUE",
"JPY": "RATE_VALUE"
}
}The endpoint and values are placeholders, not claims about a provider or current market rates. Replace them with the selected API documentation, then verify direction, timestamp, numeric type, missing symbols, and error behavior.
端点与数值均为占位示例，不代表任何供应商或当前市场汇率。请按选定接口文档替换，并校验方向、时间戳、数值类型、缺失币种和错误行为。
Fields a production response should make unambiguous生产响应中应明确的字段
| Field字段 | Validation校验要求 |
|---|---|
base / quote | Valid currency identifiers with an explicit pair direction有效币种标识，并明确币种对方向 |
rate / rates | Positive decimal values with a documented rate type and precision正数十进制值，并说明汇率类型和精度 |
timestamp | Source observation time, timezone, and freshness—not only server response time来源观测时间、时区与时效，而不只是服务器响应时间 |
source | Provider or methodology identifier sufficient for provenance足以追溯来源的供应商或方法标识 |
success / error | Machine-readable error code, message, and retry classification机器可读错误码、消息与是否可重试分类 |
Integration checklist for a free currency API免费汇率接口接入清单
- Validate base and quote codes before sending the request.
- Set an explicit timeout and handle 4xx, 5xx, and rate-limit responses separately.
- Store the source timestamp, retrieval time, provider, and raw response checksum.
- Use decimal arithmetic and make cache or database writes idempotent.
- Alert on stale timestamps, schema changes, missing pairs, and quota exhaustion.
- 发送请求前校验基准币与目标币代码。
- 设置明确超时，分别处理 4xx、5xx 与限频响应。
- 保存来源时间、抓取时间、供应商与原始响应校验值。
- 使用十进制运算，并让缓存或数据库写入具备幂等性。
- 对陈旧时间戳、结构变化、缺失币种对与额度耗尽告警。
Validate FX data before production use外汇数据用于生产前的校验
Reference rates are not executable prices参考汇率不是可成交价格
A midpoint or official reference rate does not include a bank spread, card fee, slippage, or a venue-specific bid and ask. Label the data accurately and do not present it as an execution guarantee.
中间价或官方参考价不包含银行点差、银行卡费用、滑点或特定交易场所的买卖价。应准确标注数据口径，不能将其描述为成交保证。
Freshness, continuity, and outlier checks时效、连续性与异常值检查
Reject non-positive or malformed rates, detect stale source timestamps, compare reciprocal pairs within a defined tolerance, and classify missing observations. A second source can trigger review, but should not silently manufacture a replacement value.
拒绝非正数或异常结构，检测陈旧来源时间，在设定容差内比较倒数币种对，并分类缺失观测。第二来源可触发复核，但不应静默创造替代值。
Quota-aware caching and refresh design感知额度的缓存与刷新设计
Match cache duration to the provider’s actual update schedule. Calling a daily reference endpoint every minute wastes quota without improving freshness. Keep a short-lived stale-on-error window for non-critical displays, but expose the observation timestamp so users and downstream services can distinguish cached data from a fresh response.
缓存时间应与供应商的实际更新计划匹配。每分钟调用一次日频参考接口只会浪费额度，不会提升时效。非关键展示可设置短暂的错误时沿用窗口，但必须展示观测时间，让用户和下游服务能够区分缓存数据与新响应。
Retries, circuit breakers, and provider fallback重试、熔断与供应商回退
Retry only transient failures with exponential backoff and jitter. Do not retry invalid currencies, authentication failures, or exhausted monthly quotas as if they were network timeouts. A fallback provider must be normalized to the same pair direction, timestamp rules, and rate type before its values can replace the primary source.
只对暂时性故障使用带随机抖动的指数退避。无效币种、认证失败或月度额度耗尽不能当作网络超时反复重试。备用供应商的数据必须先统一币种对方向、时间戳规则和汇率类型，才能替代主数据源。
Licensing, attribution, and redistribution许可、署名与再分发
Free access to an endpoint does not automatically grant the right to cache indefinitely, publish a bulk download, resell the data, or remove attribution. Keep the terms version and review date with the integration record, and re-check them before changing how the data is displayed or distributed.
免费访问端点并不自动授予无限期缓存、公开批量下载、转售数据或移除署名的权利。应在接入记录中保存条款版本和复核日期，并在改变数据展示或分发方式前重新检查。
How QVeris helps you find a free forex quotes APIQVeris 如何帮助查找免费外汇报价 API
QVeris helps developers and agents discover and inspect callable capabilities. Open the QVeris tool details to inspect its inputs and outputs, then follow the QVeris documentation to connect them. QVeris can reduce discovery and schema-inspection work; it does not change a provider’s rates, license, quota, or service level.
QVeris 帮助开发者与 Agent 发现并检查可调用能力。可打开 QVeris 工具详情，查看相关能力，检查输入输出，再按 QVeris 文档完成接入。QVeris 能减少发现与结构检查工作，但不会改变供应商的汇率、许可、额度或服务水平。
Free forex quotes API questions免费外汇报价 API 常见问题
Yes. Public endpoints and free plans exist, but freshness, coverage, source, attribution, and quotas differ.
Yes, for reference rates and some market data. Verify whether the response is daily, delayed, intraday, midpoint, or bid/ask.
There is no universal best option. Match the provider to required pairs, freshness, source, quota, rights, and reliability.
Some endpoints are keyless, but they may require attribution, enforce limits, or restrict redistribution.
Do not treat a search converter as an official supported API. Choose a documented endpoint with explicit terms.
Not necessarily. “Latest” may be daily, hourly, delayed, or intraday; inspect the source timestamp and methodology.
有，但公共端点和免费套餐在时效、覆盖、来源、署名和额度上不同。
不一定。“最新”可能是日频、小时、延迟或盘中数据，应检查来源时间与方法。
按币种对、时效、来源、免费额度、许可、错误处理和运行可靠性选择。
不能默认可以。无密钥端点仍可能要求署名、限制缓存、商用或再分发。
不能默认使用。参考价通常不包含买卖价差、费用、滑点和结算条件。
监控成功率、限频、陈旧时间戳、结构变化、缺失币种对与条款更新。