# ORATS API Reference

> Market data, backtesting, and scanning APIs for options traders. Each page below is available as plain Markdown for LLMs by appending .md to its URL.

- [OpenAPI specification](https://orats.com/openapi.json): OpenAPI 3.1 document for every endpoint (YAML at https://orats.com/openapi.yaml).
- [Site index for agents](https://orats.com/llms.txt): what ORATS is for, when to use it, and how to call it.

## Docs

- [authentication](https://orats.com/docs/authentication.md): Learn how to authenticate into the API, how to connect to live data, and how to change the data format.
- [backtest-finder-api](https://orats.com/docs/backtest-finder-api.md): Search hundreds of millions of precomputed option strategy backtests by ticker and strategy, then retrieve full results: summary stats, monthly returns, trade logs, and daily returns.
- [core-research](https://orats.com/docs/core-research.md): Study our methods behind developing hundreds of proprietary indicators.
- [definitions](https://orats.com/docs/definitions.md): Explore verbose definitions for all of our fields across all endpoints.
- [delayed-data-api](https://orats.com/docs/delayed-data-api.md): Get delayed options data augmented with hundreds of proprietary indicators. Current market data is delayed by 15 minutes.
- [delayed-intraday-api](https://orats.com/docs/delayed-intraday-api.md): Get delayed one-minute options data for over 5,000 symbols. Current market data is delayed by 15 minutes. History can be queried from August 2020 up to 15 minutes ago.
- [errors](https://orats.com/docs/errors.md)
- [historical-data-api](https://orats.com/docs/historical-data-api.md): Get historical end-of-day options data back to 2007 augmented with hundreds of proprietary indicators.
- [historical-intraday-api](https://orats.com/docs/historical-intraday-api.md): Get historical one-minute options data for over 5,000 symbols. History can be queried from August 2020 up to yesterday's close.
- [intraday-backtester-api](https://orats.com/docs/intraday-backtester-api.md): Run custom intraday option backtests with one-minute precision: submit a job, poll its status, then retrieve summary stats, monthly returns, daily returns, and the per-leg trade log.
- [live-data-api](https://orats.com/docs/live-data-api.md): Get live options data calculated in real-time with less than 10 seconds of market delay.
- [live-derived-data-api](https://orats.com/docs/live-derived-data-api.md): Get live options data calculated in real-time with less than 10 seconds of market delay. These endpoints are the same as the Live Data API endpoints, except they do not include OPRA data, which means the bid-ask price, size, and volume are null.
- [live-derived-intraday-api](https://orats.com/docs/live-derived-intraday-api.md): Get live one-minute options data for over 5,000 symbols, calculated in real-time with less than 10 seconds of market delay. These endpoints are the same as the Live Intraday API endpoints, except they do not include OPRA data, which means the bid-ask price, size, and volume are null. History can be queried from August 2020 up to 1 minute ago.
- [live-intraday-api](https://orats.com/docs/live-intraday-api.md): Get live one-minute options data for over 5,000 symbols, calculated in real-time with less than 10 seconds of market delay. History can be queried from August 2020 up to 1 minute ago.
- [option-scanner-api](https://orats.com/docs/option-scanner-api.md): Scan live and delayed option chains for trade candidates matching a strategy definition. Returns candidates with pricing, greeks, probability of profit, and risk metrics.
- [time-and-sales-api](https://orats.com/docs/time-and-sales-api.md): Tick-level option trade prints, each enriched with delta, gamma, implied volatility, and the underlying stock price at the time of the trade.