VERY NICE!! Know this was a lot of hard work on your part!
You even figured a very clever way to include "sell from portfolio" to cover all the bases.
I read your Peer Cube blog post.
The comments on Never Late are spot on. Assume Never Late unless certain a loan is not.
This means one will never sell a perfectly good Never Late at a low price by accident.
It may sound counterintuitive but I intend to hold my NOT Never Late notes and let the chips fall where they may.
The Folio market requires very substantial discounts to sell them and I'm at an informational disadvantage to the expert buyers there.
The more I keep the better my diversification; I'll rely on the law of large numbers to deal the cards and let them fall where they may.
Markup/Discount range is exactly what I had in mind (and I implemented what you did pretty much verbatim in my own software).
Is Outstanding Note Principal a number or a range (or a percentage range)? We all know that as Never Late notes mature probability of default declines and the Folio Markup/Discount increases (up to a point). Not sure how you've implemented it, but this could be the most important feature by which sellers may target their offer prices.
Kudos!!