MissingEndo API has a terrible success rate

[hierocles]

The API delivers players that the given player had already endorsed a while ago, players that no longer exist, and players that haven't been in the region for well over a month. Using archer, I'm probably getting less than a 50% success rate for players that actually can be endorsed.

I'm not sure if this is an issue with nationstatesplusplus.net deployment, or the code itself.