It's a new service to replace P411; used by SPs to verify who you are before accepting a booking
With the US taking down all the old services like Backpages and P411 there are all kinds of replacements popping up, mostly based overseas to keep US laws enforcement out of it.
As always be wary of signing up, you trade convenience for possible harm; either from intentional misuse of your data or a hack causing them to lose control.
