# START

- [说明](https://doc.itick.org/start/shuo-ming.md): iTick 金融数据产品服务总览：数据覆盖范围、API 类型、更新频率、数据精度与服务等级协议(SLA)详细说明。
- [获取授权](https://doc.itick.org/start/huo-qu-shou-quan.md): 获取 ITick API 授权认证：API Key 申请流程、认证方式、权限管理与使用限制说明，快速开始接入金融数据服务。
- [产品清单](https://doc.itick.org/start/chan-pin-qing-dan.md): iTick有API接口对应的股票、基金、期货、指数、加密货币等产品的标准代码与基础信息列表
- [错误代码](https://doc.itick.org/start/cuo-wu-dai-ma.md): iTick API 完整错误代码参考中心。当您遇到请求失败、认证失败、配额超限等问题时，可在此找到即时帮助
- [K线结构](https://doc.itick.org/start/k-xian-jie-gou.md): iTick K 线数据结构详解：时间粒度、OHLCV 字段、复权类型、数据质量与实时 K 线推送机制，适用于量化分析与图表展示。


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