Do you throttle API calls?

Due to an error in our application, we were making a lot more calls to your feed API than necessary (>10,000 per day). We're gathering about 1000 articles per day, cache results for 7 days, and archive articles after 31 days. We also discard articles after 5 failed tries to your API. This means we're expecting 2000-3000 API calls per day now.

Strangely enough, the postrank fetching through the API works fast on my local machine with the same API key, but takes about 1min per API call on the live system (IP: 70.32.113.244). Is there any chance your API throttles or blocks requests from this IP? The HTTP response gives a 200, but with a massive delay.

We might be open for paid usage of your API as well if that our API calls exceed what you consider "normal" - I couldn't find any standards about this in your developer documentation.

If required, I can provide our API key in a private conversation.

Example:
curl -v "http://api.postrank.com/v2/feed/info?id=http://www.myinkblog.com/feed&appkey=postrank.com/example"
* About to connect() to api.postrank.com port 80
* Trying 75.101.138.238...