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Limits

Minute limits use a sliding 60-second window. Refused calls are never billed and do not count toward the window that refused them. In order, a search is checked for: IP limit, key and plan, module, format, body, input validity, concurrency, per-minute limit, then quota. So an invalid body does not use a per-minute slot, but a valid search refused for quota does.

Retrying

Every 429 sends Retry-After in whole seconds (at least 1). Wait that long, then retry once; do not retry in a tight loop.
To run many searches, keep at most two in flight and stay under 20 per minute per account. Remember that searches made in the dashboard at the same time count too.

Size and time limits

Set your HTTP client timeout above 30 seconds (60 is a good value), or a slow search may be billed on our side while your client has already given up.