It looks like it was you username. It is my opinion that username should never be used as an API spam detection mechanism, it is also my opinion that an IP address is not a very accurate (avoiding false positives) / powerful (always catch new spammers) mechanism for detecting spam, since they get re-added back to the pool, and with the availability of IPv6, they will be bought and disposed of in larger quantities and very quickly than ever before. But, how else can API's define a user (email addresses can very quickly be disposed of and automated)
This is why I'm not that much of a fan of API's, particularly multiple APIs layered on top of each other, the more APIs you use, the more likely you are to get false positives.