Very very doubtful. The base plan is $24 and covers 5000 users (a fairly large amount). If it saves 1 hour of developer time a month to maintain the code/infrastructure/bugs/issues/scaling you're already looking at a 50% price savings. Through building this I can guarantee that it will save way more than 1 hour a month.
But you could create a very simple response and add numbers pretty easily. And at .075 cents per message I gotta think, in the long run, Twilio is a cheaper alternative.
I should add that I work for Twilio so I'm a bit biased. However, I love your idea. Just trying to do the math. :)
Twilio is the SMS/Voice provider so the bias doesn't really apply :) Thats why I kept the SMS/Voice rate the same as twilio. Not trying to make money of SMS/Voice just trying to implement a service over it so its easy to use. Have you tried out ezGAuth? Love to know what you think. I'll probably try to seek out someone from twilio soon for some sort of relationship since it helps their sales too.
There are also the added benefits of doing your 2FA independently. Furhter, should the long run come, we give you full read/delete perms on all the data so you can implement it yourself.
