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

# Arcus API

> REST and WebSocket APIs for the Arcus exchange

Arcus is a next-generation decentralized exchange built by dYdX Labs, designed from the ground up for trading tokenized equities and perpetuals.

This site documents the Arcus REST and WebSocket APIs. Start with the introduction below, or jump straight to the endpoints reference.

<CardGroup cols={2}>
  <Card title="REST API introduction" icon="server" href="/api-reference/introduction">
    Base URLs, request/response shapes, and where to go next.
  </Card>

  <Card title="Authentication" icon="key" href="/api-reference/authentication">
    Generate an Ed25519 key, register it, and sign requests.
  </Card>

  <Card title="WebSocket overview" icon="bolt" href="/api-reference/websocket">
    Connect once and subscribe to channels for market data and order updates.
  </Card>

  <Card title="Use the docs from your AI assistant" icon="plug" href="/ai-tools/mcp">
    Add the docs as an MCP server in Claude Code, Cursor, or Windsurf.
  </Card>
</CardGroup>