Are the Shopper API endpoints rate limited, and what counts as the client?

The Shopper API applies rate limiting. If you call it from a backend-for-frontend or another proxy rather than directly from the browser, you must forward the required security headers, including the Shopper API key, for the API to behave correctly. Confirm with support how the limit is attributed in your specific setup before you build a job that issues large batches of requests, for example a feed generator.

The standard rate limit is 10k/s with a burst on 10k/s.