You are subject to throttling.
You can get more calls by first registering your application. After that you get access to a detail page which includes a value for
key. The description for that field is:
Pass this as key when making requests against the Stack Exchange API to receive a higher request quota.
This is not considered a secret, and may be safely embed in client side code or distributed binaries.
Once you have your key, the url to use becomes:
I have an example here where I use a
key query parameter in a similar way.
Keep in mind to still check for the existence of a value in the
backoff field in the wrapper response. It indicates the number of seconds to wait before you are allowed to make the next call.