[tokenizerrr]

Apparently they offer an in-house solution.

> MePIN comes as a distributed hosted service containing simple-to-use REST API and handy client side scripts. Hosted or in-house white label solution is also possible, contact [e-mail].

[streetnigga]

Cool! I wondered the same question you are responding to after getting a 2-factor mobile app for an online service I use.

"What happens if/when these fellas implode?"

The answer in the site's case would be to fall back to SMS. Something like this that could be integrated into the site itself would be better, working in tandem with a more typical fall-back of course.