We have updated the API usage parameters. The API continues to be free, with no usage limits. However, to use the API requires an API Key. To obtain a API Key, you need to first Sign Up, and then Sign In. Then, claim a domain via My Domains. You will then be assigned an API Key to use. Each domain is assigned an unique API Key which can only be used for that domain. Enter your domain-specific API Key in your widget parameters section as 'apikey' variable.
We require minimal information for Sign Up: just your name and email address. We guarantee 100% privacy. Your information will not be shared with any third parties. You will not be placed on any mailing lists. We have a zero spam tolerance policy.