What you'd really like of course is not listing data, but TRANSACTION data from the secondary market.
The inventory data is mostly meaningless because listings are almost all stupid, priced way too high to sell. People post such listings because they (like you and me) don't have transaction data, so they can't see at what price similar notes have been selling, so they post a real high sell price and just see what happens, and then reduce the sell price later, sometimes in little tiny steps, day after day. This is a stupendous waste of investors time, a stupendous waste of the folio servers, etc.
I have asked LC several times to publish secondary market TRANSACTION data. Unfortunately, there is really no one to talk with at LC who actually thinks about the secondary market. The thing isn't profitable for them, so its been on autopilot for years. Its even almost impossible to get software bugs fixed. There's apparently no budget allocation for maintenance. Given that there's no human at their end managing thing, there's probably no hope.
When something comes up that requires them to spend a little bit of money ... perhaps a regulatory change, or the addition of some feature to the notes, or a bad software bug in the folio interface, the most likely thing is that they'll shut down the secondary, just like Prosper did.
A shame, because with a little work, it could be so much better, and possibly even draw investor interest.
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