Why can an IP address be blocked from making API calls?
If you see in the API call results that your IP is blocked, it can happen for 2 reasons:
1. In your settings, the IP address you are trying to make the call from is blocked.
You can find the IP restrictions at the bottom of this page.
2. You are trying to make the API call with a non-existing API Key. If you make the calls with an API Key that doesn't exist (or incorrect) several times, the IP address you are making the calls from gets blocked.