The feedburner awareness API seemed to be working fine till last night but its not working right now. Its not even down but returning 0 for every site. I wonder if there is something I am missing or have the removed this functionality or something.
However if I give dates with feedburner it gives the values.
Anyone knows what is going on? I tried looking for any change in the API but didn't find any. Neither could I find a way to ask google about it.
According to the Awareness API documentation, circulation — an approximate measure of the number of individuals for whom your feed has been requested in the 24 hour period described by date. So just add &dates=YYYY-MM-DD, where date is a day before yesterday. This way you will always get the result, fresh and grater than zero.