> For the complete documentation index, see [llms.txt](https://docs.niza.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.niza.io/websocket-api-1.0/overview.md).

# Overview

WebSocket API offers real-time market data updates. WebSocket's is a bidirectional protocol offering fastest real-time data. The **public** message types presented in the Niza documentation do not require authentication. Private-data messages can be subscribed on a separate authenticated endpoint.