0 - We didn't have one. Just a landing page. Signed our first 50 clients with just a fancy powerpoint and door to door sales. It was a double sided marketplace so then had to bring those 50 clients to persuade our first "supplier" on the other side to integrate.

We lost a most of these initial clients before we could actually build what we wanted to. But then once complete a lot of them came back. In this phase id rate our MVP as a 7. We already had enough feedback to build something quite useful.