Limits

Rate limits

Requests are limited to 5 per second, as a fixed one-second window.

The counter is keyed by API key — the API-PublicKey header — so two clients behind one address do not consume each other's budget, and a busy bot cannot stop another one from cancelling its orders. Requests sent without a key (the public market-data endpoints) are keyed by client IP.

The window is per endpoint: placing orders and cancelling them draw on separate budgets, so a burst of placements never blocks a cancel. The limit applies to every endpoint, not only order ones.

When the limit is exceeded

429 Too Many Requests, with a Retry-After header in seconds and this body:

{ "error": "RateLimitExceeded", "message": "Too many requests", "retryAfterSeconds": 1 }

Order limits

Limit	Value
Active orders per currency pair	500

Exceeding it rejects the placement with Reached orders count limit. Cancel or let orders fill to make room; the cap counts open orders, not the rate at which they are placed.

There is no separate per-minute, per-hour or per-day order quota.