# Amazon, eBay, Best Buy & Newegg Price Checker by ASIN or UPC An ecommerce tool your agent can run on one prepaid apifare key. Page: https://apifare.com/tools/fayoussef/multi-marketplace-price-checker ## What you need An apifare key with credits (sign up: POST https://apifare.com/v1/signup {"email": "..."}; new accounts get 500 free credits). No other account or key. ## Inputs - `products` (array, required): Products - `marketplaces` (array): Marketplaces to check (e.g. ["Amazon","eBay"]) - `model` (string): AI model (e.g. "openai/gpt-4o-mini") - `zipCode` (string): US ZIP code (e.g. "10001") - `maxProducts` (integer): Maximum products - `concurrency` (integer): Concurrency (e.g. 5) The most relevant fields; the search result's input_schema lists all of them. ## Price 5 credits reserved per run, settled to the run's true cost, never more than 20 credits (1 credit = $0.01). Failed runs are refunded. Exact numbers: https://apifare.com/capabilities ## Run it 1. Find it: MCP search_apis, or GET https://apifare.com/v1/search?q=Amazon%2C%20eBay%2C%20Best%20Buy%20%26%20Newegg%20Price%20Checker%20by%20ASIN%20or%20UPC with Authorization: Bearer . Take the result named "Amazon, eBay, Best Buy & Newegg Price Checker by ASIN or UPC"; it carries a proxy_route. 2. Run it: MCP proxy_call with that proxy_route and the input JSON (apifare-mcp over stdio), or POST the proxy_route over HTTP with the input JSON as the body and the same Authorization header. 3. On HTTP 402, relay the body's human_readable field to your human verbatim, wait, then retry the same call. Every other error and its fix: https://apifare.com/errors.md