> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.ninjatrader.com/market-data/web-socket-api/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.ninjatrader.com/_mcp/server.

# WebSocket API Reference

This is the complete reference for the Market Data WebSocket API — the channels you subscribe to and the messages the server streams back. It covers:

* **Quotes** — real-time top-of-book quotes.
* **Depth of Market (DOM)** — bid/ask price ladders and sizes.
* **Histograms** — volume-at-price data.
* **Charts** — historical and streaming bar data, including tick charts.

> **Note**
>
> New here? Start with [Getting Started](/market-data/getting-started) to obtain access and
> authorize the connection, then see [Real-Time Data via WebSocket](/market-data/websockets)
> for the connection and subscription protocol.

Pick a channel in the sidebar to see its subscribe request and the message schema the server streams in response.

> The real-time market-data channels and message schemas.


## API Docs

- WebSocket API > Quotes [quotes](https://docs.ninjatrader.com/market-data/web-socket-api/quotes/quotes.md)
- WebSocket API > DOM [dom](https://docs.ninjatrader.com/market-data/web-socket-api/dom/dom.md)
- WebSocket API > Histogram [histogram](https://docs.ninjatrader.com/market-data/web-socket-api/histogram/histogram.md)
- WebSocket API > Charts [charts](https://docs.ninjatrader.com/market-data/web-socket-api/charts/charts.md)
- WebSocket API > Sentiments [sentiments](https://docs.ninjatrader.com/market-data/web-socket-api/sentiments/sentiments.md)

## AsyncAPI Specification

The raw AsyncAPI 2.6.0 specification for the WebSocket channels is available at:
- [AsyncAPI JSON](https://docs.ninjatrader.com/asyncapi.json)
- [AsyncAPI YAML](https://docs.ninjatrader.com/asyncapi.yaml)