Once I did a request with a valid API key

> http://api.stackoverflow.com/0.8/stats?key=MYKEY

Every requests later on without key using existing session with API key, limit counter keep decreasing.

> http://api.stackoverflow.com/0.8/stats

For example, If the user use one of the proxy with a key and any other people who use later on that proxy with no key will get with remaining 10k limit just like with API Key access. Then it will be serious case right?

So, Please don't allow requests with No Key to use existing session with API Key. Just let them use per IP based sessions.