The superfecta module Send to URL is only used to send CNAM data to an external API after the name has been found. If you want to query an external URL for name data, the superfecta module to do this is called Regular Expressions 1.
It would be quite easy to provide an EZCNAM module for superfecta, just need to create a file in the style of
/var/www/html/admin/modules/superfecta/sources/source-OpenCNAM.module