Any free site that asks for my credit card makes me nervous. Site seem legit but who knows.

But unless someone with cred can vouch for them I'd say advoid. It sounds like a scam to me.  

From what I've read there, most credit-card based verification methods shouldn't be trusted. And you should just extend it to 'all' as a rule. The 'big' ones are around and trusted for a reason.

i agree with this post. the big one around are the ones to be trusted like date-check.com and p411.com  never heard of the one you mentioned..

IndianaProvider