Theta Data 是一家高性能金融数据提供商，专注于提供美国股票及期权市场的实时与历史行情数据，专为算法交易和量化研究而设计。它通过本地终端 API 提供粒度精细、低延迟的数据，涵盖成交、报价及希腊值（Greeks）等信息，常被用于回测，例如 QuantConnect.com。
此服务商级交接只保留公开 ID，不会猜测工具或业务任务；请在重新发现时选择当前工具，之后才能把配置视为完整。
A symbol can be defined as a unique identifier for a stock / underlying asset. Common terms also include: root, ticker, and underlying. This endpoint returns all traded symbols for options. This endpoint is updated overnight.
A symbol can be defined as a unique identifier for a stock / underlying asset. Common terms also include: root, ticker, and underlying. This endpoint returns all traded symbols for options. This endpoint is updated overnight.
