New here? Start with Choose your protocol for a side-by-side feature and latency comparison.
Spot
Order management, account data, market data, funding, and Earn on Kraken’s Spot trading engine.Spot REST
Account, trading, funding, and Earn. Public and private endpoints over HTTPS.
Spot WebSocket
Real-time market data and order entry. v2 recommended; v1 maintained.
Spot FIX
Lowest-latency order entry via Unified FIX 4.4.
Derivatives
Perpetuals and dated contracts on BTC, ETH, and more.Derivatives REST
Order entry, account, positions, fills, and historical data.
Derivatives WebSocket
Streaming-only market data and account updates.
Derivatives FIX
Order entry via Unified FIX 4.4 — same session as Spot FIX.
Affiliate
Referred-user activity for approved affiliates. Use the same host and HMAC-SHA512 API keys as Exchange REST.Introduction
Who it is for, prerequisites, and conventions.
REST
Signing, day vs history, product keys, pagination.
Rate limits
Call counter and polling cadence.
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Choose your protocol
Side-by-side feature, latency, and sequencing comparison.
Authentication
HMAC-SHA512 signing for REST and WebSocket private endpoints.
Rate limits
Limits across REST, WebSocket, and FIX.
Errors
Common errors and how to resolve them.