CompsAPI MCP Server · eBay Sold Listings for AI Agents

Hosted MCP server that gives any AI agent real eBay sold listings: up to 3 years of price history and the real accepted Best Offer price, not the crossed out asking price. Ask for comps in plain language, get structured sold data back.

Server URL: https://api.compsapi.com/mcp (streamable HTTP, no install)
Auth: your CompsAPI key in the Authorization header, free key at app.compsapi.com (100 searches a month, no card)
Docs: compsapi.com/docs

Setup

Claude Desktop, Claude Code, Cursor and any other MCP client that supports remote servers:

config.json

{
  "mcpServers": {
    "compsapi": {
      "url": "https://api.compsapi.com/mcp",
      "headers": { "Authorization": "Bearer sk_live_YOUR_KEY" }
    }
  }
}

Claude Code one-liner:

Terminal

claude mcp add --transport http compsapi https://api.compsapi.com/mcp --header "Authorization: Bearer sk_live_YOUR_KEY"

Tool

`search_sold_listings`

Search real eBay sold listings. Returns price statistics (average, median, range, best offer share) plus the newest matching sales.

Parameter	Description
`query`	What to search, e.g. `charizard psa 10`
`days`	How far back, 1 to 1095 (3 years). Default 90.
`condition`	`new`, `open_box`, `refurbished`, `used`, `parts`
`best_offer`	`1` adds real accepted offer prices, `only` returns accepted offers only
`site`	eBay marketplace: `US` (default), `UK`, `DE`, `FR`, `IT`, `ES`, `CA`, `AU`
`category`	eBay category id(s), e.g. `31387` for wristwatches
`min_price` / `max_price`	Sold price range
`page`	Result page, newest first

Example prompts once connected:

"What does a PSA 10 Charizard actually sell for? Last 90 days."
"Median sold price for a Rolex Submariner 126610 this year, accepted offers included."
"Compare what iPhone 15 Pro sells for on eBay UK vs US."

Why this data

eBay put sold listings behind a login in 2026 and the public sold search only ever showed 90 days. CompsAPI returns up to 3 years of real sales, including what accepted Best Offers actually closed at. Full REST API with the same data at compsapi.com.

Not affiliated with eBay Inc. eBay is a trademark of eBay Inc.