Underpriced AI
https://underpricedai.com/api/mcp ↗
Description
Resale prices for secondhand items from real eBay sold listings, with comps and a worth-it verdict.
What our measurements say
Underpriced AI is a remote MCP server published at underpricedai.com. It has been probed 13 times since 9/12/2026. It answered in 13 of them (100.0%), a near-uninterrupted record. Median response time is 996 ms, a delay an agent will notice. It offers a narrow, focused set of 6 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Some tools (e.g., get_sold_comps) have clear use cases in their descriptions.
- Logical flow between price_item and worth_it tools is documented.
Weaknesses
- Tool names like 'price_item' are vague about their specific function.
- Parameter requirements are inconsistently documented (e.g., cost in price_item is unclearly marked as optional).
- Overlapping functionality between price_item and list_on_ebay could confuse agents.
price_item— Parameters like 'cost' and 'image_url' have unclear required statusget_scan_result— No error handling for invalid scan_id mentionedlist_on_ebay— Parameter 'price' is optional but critical for listing creationbuy_credits— Incomplete description of payment flow for 'pay as you go' option
Verdict
Event narrative
Risk: low
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test failed · last run:
- Cold-start: cold 348ms → warm 171ms (penalty 177ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
price_itemWhat a secondhand item sells for on eBay US: a calibrated estimate with a range, the recent real sold comps behind it, three list prices (fast, market, patient) with the 14-day sell chance, the net after eBay fees, and a worth-it verdict when you pass what the user would pay. Give image_url (a public https link to a photo) whenever one exists; a description alone works but reads less.
descriptionstringimage_urlstringconditionstringcostnumber
get_sold_compsThe most recent real eBay US sales for a search query (brand, model or pattern, a few specific words), with the count, median and quartiles. Use when the user wants to see what actually sold and for how much.
querystringrequired
worth_itNet after eBay fees and a verdict (worth it / thin / pass) for an expected sale price and what the user would pay. Pure arithmetic; use price_item first when the sale price is unknown.
expected_sale_pricenumberrequiredcostnumberrequired
buy_creditsWays to pay for Underpriced AI scans. Without a choice it lists the credit packs (credits never expire), pay as you go ($0.25 per photo scan on a monthly bill, no cap), and for a signed-in user their balance. With a pack it returns a Stripe Checkout link for that user; with PAY_AS_YOU_GO it returns the link that puts a card on file so scans just run from then on. Anonymous callers get the pricing page link.
packstring
get_scan_resultFor a signed-in user: the finished result for a scan on their account, in the same shape as price_item, once the sold comps have landed in the background. Call it with the account.scanId a photo price returned when that result said comps were still loading (about 20 seconds later), or to re-read any saved scan.
scan_idstringrequiredcostnumber
list_on_ebayFor a signed-in user: turns a photo scan from price_item (account.scanId) into an inventory item with a draft eBay listing on their Underpriced AI account (title, list price defaulting to the market price, condition, description) and returns the link where they review and publish it in the app, plus whether eBay is connected and the connect link if not. It never publishes anything; publishing happens in the app after the user checks the listing.
scan_idstringrequiredpricenumberconditionstringtitlestring
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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