To Apply Rate Limiting 1.0.0 or 1.1.0
In API Manager > API Administration, click a version number for an API.
Click Policies > Apply New Policy.
In Select Policy, click Rate Limiting and Configure Policy.
In Apply Rate Limiting Policy, you can set the number of requests, period of time for receiving the requests, and a time unit.
For example, in the Limits section of the policy configuration dialog, you can set the following limits.
# of Reqs Time Period Time Unit
In the case of the Rate Limiting Policy 1.0.0 and 1.1.0, if the API receives 123 requests within 2000 ms, the API rejects further requests, and if the API receives 100 requests within 1000 ms, the API rejects further requests.