Free while this is in beta. You get the whole thing: unlimited vendors, unlimited attestations, reminder email, CSV export, and as many teammates as you want.
Everything, no limits, no card. In exchange I would like to hear what breaks and what is missing.
A flat monthly price per team, in the range a small shop can approve without a procurement cycle. No per-vendor pricing, because charging you more for tracking more vendors is backwards.
Accounts created during the beta keep the beta terms for a year after pricing starts. If the price does not work for you, your data exports as CSV and you owe nothing.