A great idea! But I think there are many features you need to add in for this new baby.
I learned lots of domain vetting trick from lots of places. So I just share what I want to see now, hope helps:
1. Pagerank. Even it is zero or none, I would like to know.
2. DA, PA from MOZ
3. CF, TF from Majesticseo
4. Domain's age, registers and drops checker
5. Refering domains and pages from ahref and majesticseo
6. Anchor diversity from ahref and majesticseo
7. Penalty checker. Site and info a domain
8. Spam checker. Check easy spammed anchors, like adult, uggbags, pharmacy and so on.
9. Archive.org history checker. Check history.
Current I do this by using multi-tools and cost me lots of time. I hope you can design a nice tool, so I can do all the work easily in one place.