As a continuation of our efforts to simplify the BitMEX API, we are scaling the REST rate limiter from a 5 minute interval to a 1 minute interval.
This does not change the 1 request / second rate at which the limiter replenishes. Note that current rate limits will be prorated from 5 minutes to 1 minute. For example, a 300 requests / 5 min rate limit will translate to a 60 requests / 1 minute rate limit.
This change should not break applications that respect the X-Ratelimit-Remaining header. If the previous 300 requests / 5 minute rate limit is hardcoded into your application, you will need to update it.
The new rate limits are live on Testnet for you to demo, and will be deployed to production on 22 May 2019 at 18:45 UTC. During this production deployment, which will last about 15 minutes, users may receive inconsistent values on the X-Ratelimit-Remaining header. Otherwise, this update should be transparent to users.