Free Crypto Price API
Data, Limits & Integration免费加密货币价格 API
数据、限额与接入方法

Live cryptocurrency price API fields实时加密货币价格接口需要哪些字段

List the symbol or provider ID, quote currency, price, source timestamp, 24-hour change, volume, and market cap. Treat “live” as a claim to verify: compare the response timestamp with the provider's documented update cadence.

列出币种代码或供应商 ID、计价货币、价格、数据源时间戳、24 小时涨跌、成交量和市值。不要只看“实时”标签，应将返回时间戳与官方更新频率对照。

Historical crypto price API depth历史加密货币价格 API 的数据深度

Record the earliest available date, candle interval, timezone, missing-data policy, adjustment rules, and whether OHLCV is included on the free tier. “Historical data available” may still mean a short retention window.

记录最早日期、K 线粒度、时区、缺失值处理、修正规则，以及免费额度是否含 OHLCV。“支持历史数据”不代表免费方案有足够长的回溯区间。

REST snapshot with curl使用 curl 获取 REST 行情快照

Request a small payload first and inspect the HTTP status, content type, timestamp, and unit before reading the price.

先请求小型响应，在读取价格前检查 HTTP 状态、Content-Type、时间戳和计价单位。

curl --fail-with-body \
  "https://api.coinlore.net/api/ticker/?id=90"

JavaScript validation with timeout and field checks用 JavaScript 验证超时与关键字段

Treat the upstream response as untrusted input. Check status, shape, numeric parsing, and freshness before returning data to the UI.

把上游响应视为不可信输入。在数据进入界面前，检查状态码、结构、数值解析和新鲜度。

const response = await fetch(endpoint, {
  signal: AbortSignal.timeout(5000)
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);

const payload = await response.json();
const price = Number(payload[0]?.price_usd);
if (!Number.isFinite(price)) throw new Error("Invalid price");

WebSocket lifecycle checklistWebSocket 生命周期检查清单

For streaming feeds, verify subscribe acknowledgements, sequence or event timestamps, heartbeat behavior, reconnect backoff, resubscription, duplicate messages, and the maximum number of symbols per connection.

使用流式行情时，应验证订阅确认、序列号或事件时间、心跳、重连退避、重新订阅、重复消息，以及单连接允许订阅的最大币种数。

Test a crypto price API without an API key测试无需 API Key 的加密货币价格接口

Start with a provider's documented public endpoint. Save the raw JSON, HTTP status, response headers, timestamp, and any rate-limit headers. A successful browser response is only the first test; also request an invalid symbol and repeat calls until you understand the failure contract.

从供应商文档中的公共端点开始，保存原始 JSON、HTTP 状态、响应头、时间戳和限流信息。浏览器能返回数据只是第一步，还要请求无效币种并重复调用，理解错误与限流约定。

Build for rate limits, caching, and fallbacks为限流、缓存与降级设计

Cache by asset and quote currency, deduplicate concurrent requests, use exponential backoff for 429 responses, and avoid embedding private keys in client-side code. Define what the UI shows when data is stale or unavailable.

按币种与计价货币缓存，合并并发请求，对 429 使用指数退避，并避免把私密 Key 放进前端代码。还要定义数据过期或不可用时界面如何降级。

Keep API keys and provider logic on the server将 API Key 与供应商逻辑保留在服务端

A backend adapter prevents secret exposure, normalizes provider-specific IDs and fields, enforces a shared cache policy, and gives the frontend one stable response contract. Restrict keys by environment and rotate them when a team member or integration changes.

后端适配层可以避免密钥暴露、统一供应商特有的资产 ID 和字段、执行共享缓存策略，并向前端提供稳定的返回约定。应按环境限制 Key，并在成员或集成发生变化时轮换。

Monitor the upstream contract持续监控上游数据约定

Track latency, HTTP status, freshness lag, schema validation failures, missing assets, cache hit rate, and monthly credit use. Alert separately on provider outage, stale-but-successful responses, and a breaking field change.

监控延迟、HTTP 状态、新鲜度滞后、Schema 验证失败、缺失资产、缓存命中率和月度额度使用。供应商中断、返回成功但数据过期、字段破坏性变更应分别告警。