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Arcus exposes a REST API for account management, trading, and historical data, plus a WebSocket API for real-time market data and order routing. Both are non-custodial: you sign with an Ed25519 API key registered against your Ethereum address, and the server never sees a private key.
Fund your account before trading. A newly-registered API key starts with no balance — GET /v1/account returns 404 until you make a deposit. Use the Testnet Deposit button in the testnet web app for a quick ~$1,000, or deposit on-chain via the bridge. See Your testnet account.

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Base URLs

EnvironmentRESTWebSocket
Mainnethttps://api.arcus.xyzwss://api.arcus.xyz/v1/ws
Testnethttps://api.testnet.arcus.xyzwss://api.testnet.arcus.xyz/v1/ws
Both environments share identical paths, payloads, and signing — only the host differs, selectable from the server dropdown on each endpoint page. The code samples and API playground throughout these docs target testnet.

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Where to next

Authentication

Generate an Ed25519 key, register it, and sign requests.

WebSocket overview

Connect, send subscribe / post / get envelopes, and place orders.

Channels

Per-channel reference: market data, order book, account, candles.

REST endpoints

Auto-generated from the OpenAPI spec — see the Endpoints group in the sidebar.

Rate limits

Per-IP request weights, per-subaccount trading pools, and WebSocket caps.