Every signup, every login, every checkout stops at the same wall — a one-time passcode lands on your phone, and the agent doing the work can't see it.
Set it up once, then tell your agent “Get my OTP from margin.so for 555-555-5555” That's the whole integration.
iPhone and Android · US numbers
Because burner numbers don't work. Apple, Google, Microsoft and most banks only send codes to real mobile numbers, so a rented one gets refused at signup — exactly at the sites you most want to automate. And no messaging provider will carry other companies' passcodes anyway; at least one strips the code out before you'd ever see it. Your own number has neither problem.
We let a small number of people in each day, because an OTP relay is a security product and we'd rather grow slowly. Register your number to join the queue — nothing to pay to hold a place.