If you send too many API requests in quick succession, you'll receive a rate_limit_error
The default rate limit for search in our live environment is 10 requests per 60 seconds. Every response includes a ratelimit-limit (your current ceiling) and a ratelimit-reset (when the window resets), so you can always see the limit that applies and when you'll be able to send again.
Rate limits vary across the API, so the limit on one endpoint won't necessarily apply to another. Check the limit relevant to the endpoints you're using.
For more details, see our response handling documentation.