In order to meet the demands of growing user base and increased amount of API calls, we have been working over the clock to improve the server architecture. 

We have finished deploying a major upgrade that should yield faster conversions, more reliable API access, rapid failover in case of an issue and better autoscaling during peak times.

All updates are backward compatible and there is no requirement for an API version bump, if you are using version 5 or 6 of either API, you will automatically benefit from the changes.