Ask HN: Good OTP Vendors?

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I'm trying to create a simple app where users can sign up via phone and receive a one time password via text to confirm their identity. I've tried doing this with Twilio, but have now twice failed the 2FA Authentication campaign. Do all vendors require this? Are there simper alternatives?

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Hey! We built prelude.so for exactly that reason and many other (fraud prevention, multi-routing...). We had to built an internal solution for this back at Zenly which pushed us to create this tool!

Clerk is pretty cheap: https://clerk.com/

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