> ## Documentation Index
> Fetch the complete documentation index at: https://api.docs.rocketfi.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Price feed

> Mark / price-style feed per instrument (`SubscriptionKind::PriceFeed`).

Subscribe with **`PriceFeed`** and an **`instrumentId`**. Uses the shared **`/ws`** endpoint — [Public WebSocket streams](/guides/ws-public).