Serper Rate Limits

Serper enforces two independent limits: a queries-per-second concurrency ceiling tied to the credit package you bought, and a credit balance that stops accepting queries at zero. Credits are deducted only for successful responses. Crucially, a query is not always one credit — the cost varies by search type, by result count, and by whether you use mini-batch. Serper publishes NO rate-limit response headers, so an agent cannot read its remaining budget or a retry delay from the wire.