> ## 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.

# Auction fills

> Auction fill stream per instrument (`SubscriptionKind::AuctionFills`).

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