We only want to use 2FA for specific purposes under specific circumstances. Why doesn't this service exist?
Well Twilio's Verify APIs exist, but they're incredibly expensive ($0.05 / verification + SMS prices). If you plan on verifying users regularly, that's a huge cost.
I cannot be the only one who needs this service (can I?).
So why doesn't it exist? What am I missing?
Auth0 and similar commercial companies might very good at marketing. Try replacing "API" with "library" or a programming language name.
> It's just not valuable enough for anyone to create
For a commercial API you need to charge $10 USD/month, or equivalent in terms of per-API-call, otherwise your service won't be profitable. You call 5 US cent already expensive, so I think you're right, it's not valuable enough.
- Both libraries are not quite stand-alone a true stand-alone would be API-based (maybe include SDKs). My search comes up empty.
- How'd you determine the $10 USD / month number?
- I'm either not able to search well enough to find a tool - It's just not valuable enough for anyone to create - Schelp blindness