A sold-data API,
not just a scanner.
What is the difference between CompSniper and Underpriced AI?
Underpriced AI is a photo-first reseller app: you photograph an item, it prices it from recent eBay sales and helps you list it. Its developer API lists up to 50 recent sales from eBay US or UK per search, with no multi-year history, and counts Best Offer sales at a typical discount instead of the real price. CompSniper is a sold-data API: up to 240 sold listings per request on 8 eBay sites, up to 3 years (1,095 days) of eBay sold history, the real accepted Best Offer price with bestOfferPrice=true, plus PSA, TCGplayer, Grailed, Depop, Poshmark, Mercari and four auction houses on one key.
100 free requests · no credit card · instant API key
CompSniper vs Underpriced AI
Both price items from real eBay sales and both connect to Claude through MCP. The difference is what you build with: a listing app, or a data API.
| CompSniper | Underpriced AI | |
|---|---|---|
| What it is | Sold-data API, dashboard and hosted MCP server | Photo-first reseller app (scan, price, list) with an API |
| Sold listings per search | Up to 240 | Up to 50 listed (one eBay page) |
| eBay sites in the API | 8: US, UK, DE, FR, IT, ES, CA, AU, local currency | 2: eBay US and eBay UK |
| Sold history | Recent sales plus up to 3 years (1,095 days) on /v1/research/sold | Recent sales only |
| Best Offer sales | Real accepted price with bestOfferPrice=true (US-dollar sales) | Counted at a typical offer discount |
| Other sources by API | PSA prices and population, TCGplayer, Grailed, Depop, Poshmark, Mercari, Goldin, Fanatics Collect, Pristine, MySlabs | Used inside scans (Poshmark, Grailed, Mercari, AbeBooks, Discogs), not separate endpoints |
| Photo identification and listing to eBay | No | Yes, plus crosslisting through its extension |
| Free tier | 100 requests a month | 100 API lookups a day |
| Price per 1,000 searches | $4.50 on the $9 plan, $5 in credits with no plan | $20 pay as you go, or $149 a month for 5,000 |
| MCP for AI agents | Hosted MCP server | MCP server with 6 tools, including listing |
Underpriced AI details come from underpricedai.com (homepage, pricing, developers, MCP and llms.txt pages) as checked on November 1, 2026, and can change. Its /compsniper-alternative page (CompSniper facts checked October 9, 2026) says CompSniper's pricing accuracy is "Not stated" and credit packs are "not stated". Both are out of date: CompSniper published a blind 40-search accuracy benchmark on October 18, 2026, and sells credits at $5 per 1,000 with no plan. That page also leaves out CompSniper's 3-year history, accepted Best Offer prices, PSA, TCGplayer, Grailed and Depop.
Why developers pick CompSniper
The price buyers really paid
Accepted Best Offer sales show the asking price on eBay. bestOfferPrice=true returns the real accepted price instead of an estimated discount.
Three years, not one page
When recent sales are not enough, /v1/research/sold goes back up to 3 years (1,095 days) on all 8 eBay sites with the same key.
8 eBay sites and 10 more sources
One key covers eBay in 8 countries plus PSA, TCGplayer, Grailed, Depop, Poshmark, Mercari and four auction houses.
To be fair to Underpriced AI: it does things CompSniper does not. It identifies an item from a photo, drafts and publishes the eBay listing, and crosslists to other marketplaces, and its free API tier is daily rather than monthly. If you are a reseller who wants a scan-to-listing app, it is a good fit. If you are building with sold data, CompSniper returns more of it.
240 sold listings, one request
Send a keyword with your API key and get recent sold listings with the median and range computed. Add bestOfferPrice=true for real accepted prices, or call /v1/research/sold for up to 3 years.
- Live in about 5 minutes on a free key
- Up to 240 sold listings per request
- Raw feed or optional AI cleanup
curl -H "Authorization: Bearer cs_YOUR_KEY_HERE" \
"https://api.compsniper.com/v1/scrape?keyword=iphone+15+pro+256gb&count=20"Underpriced AI alternative FAQ
Is CompSniper or Underpriced AI better for eBay sold data?+
For sold data through an API, CompSniper: up to 240 sold listings per request on 8 eBay sites, up to 3 years of history and the real accepted Best Offer price. Underpriced AI's API lists up to 50 recent sales from eBay US or UK. For scanning items with a phone and listing them, Underpriced AI does more.
Does Underpriced AI return the accepted Best Offer price?+
No. Its MCP page says Best Offer sales are shown at eBay's asking price and counted at a typical offer discount. CompSniper returns acceptedOfferPrice, the price the buyer paid, with bestOfferPrice=true.
How far back does each go?+
Underpriced AI uses recent sales. CompSniper covers recent sales on /v1/scrape and up to 3 years (1,095 days) on /v1/research/sold, on every plan including free.
Which works in Claude?+
Both. CompSniper's connector has been in the Claude directory since August 2026, and Underpriced AI's is listed there too.
Get 240 sold comps in one call
Plus 3 years of history and real Best Offer prices. Start with 100 free requests a month, no credit card.