Here Are Some Common Questions People Ask Before Registering
You'll get a confirmation email. Click the link to verify your account. Once your account is verifed you can login. Inside the Client Area, you'll find your API Key. You can use this immediately for 100/day free queries.
If you go to the menu at the top of any page, you'll find a link for "OUR APIs". There you can choose which API type you are looking into. Clicking the link will bring you to a page describing each API available in that category and a link to more documentation.
There are no rate limits, daily limits, or other limitations imposed on the Unlimited Plan. The only limit is how many IP addresses can access the API in a 24 hour period. This is to prevent fraud and abuse as well as key-sharing. Without such a limit in place, anyone could share their keys with others and abuse the system.
If you have an active plan, nothing happens, you're account will continue to function. If you have credits available, it will use from your credits for each query after the free limit is reached. If you have no credits and no active plan, you will not be able to process more queries until your limit is reset.