​Listing of multiple slabbed coins on EBay from a single picture

Hey everyone,

I’m a developer working on a niche but (I think) genuinely useful tool for the coin collecting market and wanted to get some feedback from folks who know the eBay Sell API well — and find out if anyone has already built something like this.

The idea: a mobile app that lets a coin dealer photograph one or more NGC or PCGS graded coin slabs, automatically extracts the certification number and label data using AI vision, looks up the verified coin data from the NGC/PCGS cert APIs, and then creates a draft eBay listing pre-populated with all the item specifics, title, and cropped images — all in a few taps.

The pain point is real: dealers who sell slabbed coins on eBay are manually typing “1881-S Morgan Dollar MS65 NGC” for every single coin. For someone liquidating an estate collection or running a busy shop, that’s hours of tedious data entry per week. The slab labels are highly standardized, which makes them a good candidate for automated extraction.

A few things I’m trying to figure out:

Has anyone built something similar, or seen a tool that already does this? I’ve searched around but haven’t found anything targeting this specific workflow.

For those with Sell API experience — what’s been your experience getting production access approved? Any tips for the application, or common gotchas when pushing listing drafts for coins specifically?

The Coins category has fairly strict item specifics (Year, Denomination, Grade, Certification Number, Grading Service). Has anyone run into issues with required vs. recommended fields when submitting via the API vs. the web UI?

Any thoughts on the idea itself — is this something you’d expect dealers to actually pay for, or is manual listing “good enough” in practice?

I’m still in early scoping/validation mode, so any honest feedback — including “this already exists” or “here’s why it won’t work” — is genuinely welcome.

Thanks in advance.