I thought this was interesting;
Gift link The Five-Figure Reason Hot Restaurants Are Moving to OpenTable
"* Six years ago, American Express purchased Resy — used by more than 20,000 restaurants — and added Tock to its portfolio last year. Since 2021, American Express has offered premium cardholders access to in-demand reservations on Resy.*
I see several references to Tock here on HO. I’d never heard of Tock, but noticed that was what was being used when I made a reservation at Angele in Napa yesterday.
This is the Tock link from above.