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Trade API (64)

If I exceed a rate limit, is my order queued or rejected?

Rejected, not queued. A request over the limit gets a 429 with a Retry-After header and is never executed later, so you have to send it again once that window resets. For orders, the 11th order in a second is rejected and you can place it again from the next second. Nothing is held back or replayed on your behalf.