Why did I get HTTP error code 429?

An HTTP error code 429 occurs when too many requests are sent within a set interval. In a sandbox environment, if over 50 requests are received from an IP address (cumulative hits of all endpoints) within 1 minute, the IP will be temporarily blocked for the next 5 minutes. To avoid an IP address from becoming temporarily blocked, limit the number of requests to fewer than 50 per minute.

You may also receive an API response of "RATE_LIMIT_REACHED." Generally, this is temporary to help us identify traffic that may be abusive. We do not publish our rate-limiting policy.