Choose a Free Crypto WebSocket API
for Live Market Data选择免费加密货币 WebSocket API
接入实时行情
Compare free streams for prices, trades, order books, and candles, then connect with the right authentication, limits, and recovery plan.
比较价格、成交、盘口和 K 线免费流，
再按鉴权、限制与恢复机制完成接入。
TL;DR核心结论
Confirm whether “free” means a public exchange stream, a limited provider tier, or only a time-boxed trial.
Dashboards may need tickers and candles; trading bots often need trades and order-book updates.
A real-time client needs heartbeat handling, sequence checks, reconnect backoff, and snapshot recovery.
Provider limits, licensing, geographic availability, and channel schemas can change; check current documentation.
它可能是交易所公开流、有限的免费套餐，也可能只是限时试用，三者不能混为一谈。
行情看板通常需要 ticker 与 K 线；交易机器人往往还需要逐笔成交和盘口更新。
客户端应处理心跳、序列号、指数退避重连，以及断线后的快照恢复。
限制、许可、地区可用性与字段结构可能变化，应以供应商当前文档为准。
What a real-time crypto WebSocket API should stream数字货币实时行情 API 应推送哪些数据
A crypto market data WebSocket keeps one connection open and pushes events instead of making your app poll a REST endpoint. The useful channel depends on the state your product must maintain.
加密货币 WebSocket API 通过长连接主动推送事件，避免应用反复轮询 REST。应选择什么频道，取决于产品必须维护的实时状态。
Prices, tickers, trades, candles, and order books价格、ticker、成交、K 线与盘口
- Ticker or price: latest price and rolling statistics for watchlists and alerts.
- Trades: executed price, size, side, and time for activity views.
- Candles/OHLCV: interval bars for charts; confirm whether the current candle is provisional.
- Order book: snapshots plus sequenced deltas for depth views and trading systems.
- 价格或 ticker：用于自选列表、价格提醒和滚动统计。
- 逐笔成交：用于展示成交价、数量、方向和时间。
- K 线/OHLCV：用于图表；需要确认当前 K 线是否仍会更新。
- 盘口：通常用快照加有序增量维护本地深度。
Single-exchange streams versus aggregated feeds单一交易所行情与聚合数据流
A public exchange stream can be the simplest free crypto price WebSocket feed when one venue is enough. An aggregated feed can normalize symbols and schemas across venues, but its WebSocket access may belong to a paid tier. Do not assume a provider’s free REST plan also includes WebSocket.
只需要一个交易所时，公开行情流往往是最直接的免费选择。聚合服务可以统一交易对与字段，但其免费 REST 套餐未必包含 WebSocket，必须单独确认。
Raw events versus normalized market data原始事件与标准化市场数据
Exchange-native streams preserve venue-specific fields and timing, which is useful when execution logic must match that venue exactly. Normalized providers reduce integration work by aligning symbols, timestamps, and message shapes across sources. The trade-off is that normalization can hide exchange-specific details, so document which fields are transformed and which source produced each event.
交易所原生流保留该场所特有的字段和时间语义，适合执行逻辑必须精确匹配某个交易所的场景。标准化服务会统一交易对、时间戳和消息结构，减少多源接入工作；代价是部分交易所特有细节可能被隐藏，因此应记录字段如何转换，以及每条事件来自哪个数据源。
Latency, freshness, and update semantics延迟、新鲜度与更新语义
“Real time” is not a complete specification. Check whether events are pushed on every trade, sampled at an interval, or aggregated before delivery. Record both the provider timestamp and your receive timestamp so you can detect stale data, clock drift, and processing backlogs without claiming a latency level the free plan does not guarantee.
“实时”并不是完整规格。需要确认数据是每笔成交都推送、按固定周期采样，还是先聚合再发送。建议同时记录服务端时间戳和本地接收时间，用于识别陈旧数据、时钟偏差和处理积压，不要把免费层没有承诺的延迟当成确定性能。
How to compare a free crypto WebSocket API如何比较免费加密货币 WebSocket API
| Check检查项 | What to verify需要核验 | Why it matters重要原因 |
|---|---|---|
| Free access免费范围 | Public stream, ongoing free tier, or trial; API key and account requirements.公开流、长期免费层或试用；是否需要账号与 API Key。 | Avoids temporary access dependencies.避免依赖临时权限。 |
| Channels频道 | Prices, trades, candles, order-book depth, and supported markets.价格、成交、K 线、盘口深度与市场覆盖。 | A ticker-only feed cannot rebuild an order book.只有 ticker 无法维护本地盘口。 |
| Limits限制 | Connections, subscriptions, messages, symbols, and idle timeouts.连接数、订阅数、消息数、交易对和空闲超时。 | Determines whether one connection can serve the app.决定单连接能否支撑应用。 |
| Recovery恢复 | Heartbeats, sequence IDs, replay, snapshots, and reconnect policy.心跳、序列号、补发、快照与重连规则。 | Protects state after loss or disconnects.避免断线或丢包后状态错误。 |
| Usage rights使用许可 | Display, storage, redistribution, attribution, and production use.展示、存储、再分发、署名与生产使用条款。 | Access does not grant redistribution rights.可访问不等于可再分发。 |
Three meanings of “free”“免费”的三种常见含义
Usually intended for public market data from one venue. It may require no API key, but connection, symbol, and redistribution rules still apply.
An account or key may be required. Check monthly quotas, concurrent connections, channel exclusions, and whether production use is permitted.
Useful for evaluation, but not a durable free dependency. Record the end date and the paid plan required after the trial.
通常面向单一交易所的公开行情，可能不需要 API Key，但仍受连接数、交易对和再分发条款约束。
可能要求注册和 Key。需要检查月度额度、并发连接、不可用频道，以及是否允许生产使用。
适合评估，但不是长期免费依赖。应记录结束时间，以及试用后需要升级到哪个付费方案。
Match the WebSocket feed to your application按应用场景选择 WebSocket 行情流
The best free crypto WebSocket API is the one whose data model matches the state your product must maintain. More channels are not automatically better; unnecessary depth increases bandwidth, parsing work, and recovery complexity.
最合适的免费加密货币 WebSocket API，应当与产品需要维护的状态匹配。频道越多不代表越好；不必要的深度会增加带宽、解析成本和恢复复杂度。
Portfolio tracker or live dashboard资产看板与实时行情面板
Start with ticker or price channels and add candles only when the interface displays charts. Decide how frequently the UI should repaint independently from how frequently messages arrive; batching visual updates can keep the interface responsive without discarding source events.
优先选择 ticker 或价格频道，只有页面需要图表时再加入 K 线。界面刷新频率不必等于消息到达频率；可以批量更新视图，同时保留完整的源事件处理。
Price alerts and monitoring价格提醒与行情监控
Use a price or trade stream, but define stale-feed detection and duplicate-event handling before sending notifications. Persist the last processed event or threshold state so reconnects do not trigger the same alert repeatedly.
可使用价格或成交流，但发送通知前应先定义陈旧数据检测和重复事件处理。保存上一次处理的事件或阈值状态，避免重连后反复触发同一提醒。
Trading bot and local order book交易机器人与本地盘口
A bot that reasons about spread or depth needs documented order-book snapshots, incremental updates, and sequence rules—not only a last-price ticker. Keep market-data credentials separate from trading credentials, and test state recovery before any live execution workflow.
需要分析价差或深度的机器人必须获得有文档说明的盘口快照、增量更新和序列规则，而不只是最新价。行情凭证与交易凭证应分离，并在任何真实下单流程前测试状态恢复。
Connect to a free cryptocurrency market data stream接入免费加密货币 WebSocket 行情接口
1. Read the current WebSocket documentation1. 阅读当前 WebSocket 文档
Record the wss:// endpoint, authentication method, subscription payload, channel names, symbol format, heartbeat rules, limits, and usage terms. Treat the example below as a client pattern, not a provider-specific request.
记录 wss:// 地址、鉴权方式、订阅消息、频道名、交易对格式、心跳、限制和使用条款。下面仅展示客户端模式，不冒充任何供应商的真实请求。
2. Subscribe with JavaScript or Python2. 使用 JavaScript 或 Python 订阅
const ws = new WebSocket(endpoint);
ws.onopen = () => ws.send(JSON.stringify(subscription));
ws.onmessage = event => handle(JSON.parse(event.data));
async with websockets.connect(endpoint) as ws:
await ws.send(json.dumps(subscription))
async for message in ws: handle(json.loads(message))
3. Validate messages and recover state3. 校验消息并恢复状态
Validate message types before parsing values. For order books, follow the documented snapshot-and-delta sequence exactly. Reconnect with capped exponential backoff and jitter, then resubscribe only after the connection is ready.
解析数值前先校验消息类型。维护盘口时必须严格遵循快照与增量顺序。断线后使用带随机抖动且有上限的指数退避，并在连接就绪后再恢复订阅。
4. Normalize symbols, numbers, and timestamps4. 标准化交易对、数值和时间戳
Do not assume every source uses the same symbol separator, quote currency, timestamp unit, or numeric type. Convert decimal values without losing precision, keep the original source symbol, and store timestamps in a documented UTC representation.
不要假设所有数据源使用相同的交易对分隔符、计价币、时间戳单位或数值类型。转换小数时避免精度丢失，保留原始交易对，并使用明确记录的 UTC 时间格式。
5. Test with recorded messages5. 使用录制消息测试
Save representative subscription acknowledgements, data events, heartbeat messages, errors, and reconnect sequences. Replay them in tests to verify parsing and state transitions without depending on a live market during every test run.
保存有代表性的订阅确认、行情事件、心跳、错误和重连序列，并在测试中回放。这样可以验证解析与状态转换，而不必让每次测试都依赖实时市场。
Reliability and security checklist for production生产环境的可靠性与安全检查
Connection lifecycle连接生命周期
- Track connecting, authenticated, subscribed, healthy, stale, reconnecting, and closed states explicitly.
- Use provider-documented ping/pong or application heartbeat rules; do not invent incompatible heartbeat messages.
- Cap exponential backoff, add jitter, and stop retry storms after authentication or configuration errors.
- Resubscribe idempotently and rebuild state from a fresh snapshot when sequence continuity is lost.
- 明确记录连接中、已鉴权、已订阅、健康、陈旧、重连中和已关闭等状态。
- 遵循供应商文档中的 ping/pong 或应用层心跳规则，不要自行发送不兼容的心跳消息。
- 为指数退避设置上限并加入随机抖动；遇到鉴权或配置错误时应停止重试风暴。
- 以幂等方式恢复订阅；序列不连续时通过新快照重建状态。
Credentials and browser exposure凭证与浏览器暴露风险
Never embed a private API secret in public browser JavaScript. If the provider requires a secret, terminate the upstream WebSocket on your backend and expose only the data your client is allowed to receive. Use least-privilege keys, rotate credentials, and keep market-data access separate from order execution.
不要把私有 API Secret 写入公开的浏览器 JavaScript。供应商要求密钥时，应由后端建立上游 WebSocket，并只向客户端发送其有权接收的数据。使用最小权限 Key、定期轮换凭证，并把行情访问与订单执行权限分开。
Observability and data quality可观测性与数据质量
Measure connection uptime, message lag, reconnect count, parse failures, sequence gaps, dropped messages, and queue depth. Alert on stale data rather than only on a closed socket: a connection can remain open while useful events stop arriving.
监控连接可用时间、消息延迟、重连次数、解析失败、序列缺口、丢弃消息和队列深度。告警不能只看连接是否关闭；WebSocket 可能仍然打开，但有效行情已经停止到达。
Assume the last applied update is sequence 500. The connection drops, then the client reconnects and begins buffering deltas 541, 542, and 543 while requesting a fresh snapshot. If the snapshot represents sequence 540, discard buffered messages at or below 540, apply 541–543 in order, and continue only when every next sequence is contiguous. A snapshot at 544 makes the buffered deltas obsolete; a snapshot at 538 still leaves 539–540 missing. In either case, do not publish the book as healthy until continuity is proven under the provider's documented sequence rules.
假设本地最后应用的更新序号为 500。连接中断后，客户端重新连接，一边请求新快照，一边缓存序号 541、542 和 543 的增量。若快照代表序号 540，应丢弃不高于 540 的缓存消息，再依次应用 541–543；只有后续序号持续连续时，才能恢复正常发布。若快照已经到 544，缓存增量全部过期；若快照只到 538，则仍缺少 539–540。无论哪种情况，在按照供应商序列规则证明连续性之前，都不能把本地盘口标记为健康。
Do not treat a sent subscription frame as success. Require the provider's acknowledgement or first valid event, record rejected symbols and channels, and expose partial subscription state.
Reconnects and replay windows can resend events. Deduplicate with the provider event or sequence identity while retaining amendments; timestamps alone are not a safe unique key.
Bound queues and measure consumer lag. Coalescing ticker UI updates may be safe, but dropping an order-book delta invalidates state. Slow consumers should shed optional channels, resnapshot, or disconnect cleanly.
发送订阅消息不代表已经成功。应等待供应商确认或首条有效事件，记录被拒绝的交易对与频道，并明确展示部分订阅成功状态。
重连和补发窗口可能再次发送旧事件。应使用供应商事件 ID 或序列身份去重，同时保留真正的修订；单靠时间戳不能安全判重。
队列必须有上限，并持续监控消费延迟。行情面板可以合并 ticker 界面刷新，但丢失任何盘口增量都会破坏状态；消费者过慢时应关闭非必要频道、重新获取快照或干净断开。
Use QVeris to find and evaluate crypto data capabilities用 QVeris 查找并评估加密数据能力
QVeris helps developers discover and inspect callable capabilities. Open the QVeris provider details to review their declared inputs and outputs, and compare options before wiring a provider into an agent or workflow.
QVeris 帮助开发者发现并检查可调用能力。可打开 QVeris 服务商详情，查看相关市场数据工具，查看声明的输入输出，再决定如何接入 Agent 或工作流。
- Search by the data task—live price, market data, or exchange data—not only by provider name.
- Inspect capability inputs and outputs before generating integration code.
- Verify the provider’s current free-plan and WebSocket terms in its official documentation.
- 按实时价格、市场数据或交易所数据等任务搜索，而不只搜供应商名称。
- 生成接入代码前，先检查能力声明的输入与输出。
- 最终仍需在供应商官方文档中核验免费层和 WebSocket 条款。
FAQ
Is there a free crypto WebSocket API?
Yes. Some exchanges expose public market-data streams, and some providers include WebSocket in a free tier. Confirm ongoing access and usage rights.
Which crypto API supports WebSocket?
Many exchanges and providers do, but channels and plans differ. Check official documentation for price, trade, candle, and order-book support.
Can I connect without an API key?
Some public streams allow it; others require a free account and key. Private account or trading channels normally require credentials.
How do I stream live crypto prices?
Open the secure endpoint, subscribe, process price events, answer heartbeats, and reconnect safely after interruptions.
What can a crypto WebSocket stream?
Common channels include tickers, prices, trades, OHLCV candles, order-book updates, and sometimes derivatives or on-chain events.
How should I handle reconnects and rate limits?
Use capped exponential backoff with jitter, respect limits, restore snapshots when required, and avoid immediate reconnect loops.
有没有免费的加密货币 WebSocket API？
有。部分交易所提供公开行情流，部分数据服务的免费层包含 WebSocket。需要确认它不是限时试用，并核对许可。
哪些加密货币 API 支持 WebSocket？
许多交易所和行情服务支持，但频道与套餐不同，应以官方文档为准。
可以不使用 API Key 吗？
部分公开市场数据流可以；另一些需要免费账号与 Key。私有频道通常必须鉴权。
如何用 WebSocket 获取数字货币实时行情？
连接安全端点，发送订阅消息，处理价格事件和心跳，并在中断后安全重连。
WebSocket 能推送哪些数据？
常见频道包括 ticker、价格、成交、OHLCV K 线和盘口，有时还包括衍生品或链上事件。
如何处理断线重连和速率限制？
使用有上限且带随机抖动的指数退避，遵守连接与订阅限制，并按要求重新获取快照。