{"uid":"cap_M_FpBJ0nfvkf2jvSYABzS","slug":"asin402-cross-marketplace-price-comparator-5b56d007","name":"ASIN402 Cross-Marketplace Price Comparator","description":"Where is this product cheapest? One ASIN across 11 Amazon marketplaces. Compares one ASIN's live price on Amazon US, UK, DE, FR, IT, ES, JP, CA, IN, MX and BR, converted to USD with daily ECB rates, and returns the cheapest and most expensive marketplace, the price spread and the difference vs the US. For cross-border shoppers, arbitrage and international sellers. Notes VAT and shipping caveats. Free sample: /api/sample/compare-marketplaces","url":"https://asin402.com/api/compare-marketplaces?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["asin"],"properties":{"asin":{"type":"string","description":"Amazon ASIN, 10 characters (books: ISBN-10)"},"marketplaces":{"type":"string","description":"Optional comma-separated subset of us, uk, de, fr, jp, ca, it, es, in, mx, br (default all 11)."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"fx":{"type":"object","properties":{"date":{"type":"string"},"source":{"type":"string"}}},"asin":{"type":"string"},"notes":{"type":"array","items":{"type":"string"}},"title":{"type":"string"},"cheapest":{"type":"object","properties":{"price":{"type":"number"},"currency":{"type":"string"},"price_usd":{"type":"number"},"marketplace":{"type":"string"}}},"found_in":{"type":"integer"},"priced_in":{"type":"integer"},"vs_us_pct":{"type":"number"},"spread_pct":{"type":"number"},"marketplaces":{"type":"array","items":{"type":"object","properties":{"url":{"type":"string"},"price":{"type":"number"},"currency":{"type":"string"},"available":{"type":"boolean"},"price_usd":{"type":"number"},"sales_rank":{"type":"integer"},"marketplace":{"type":"string"},"price_basis":{"type":"string"},"amazon_is_seller":{"type":"boolean"},"monthly_sold_estimate":{"type":"integer"}}}},"most_expensive":{"type":"object","properties":{"price":{"type":"number"},"currency":{"type":"string"},"price_usd":{"type":"number"},"marketplace":{"type":"string"}}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_OJLAmR3afR4i2QgRNRClu","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Compares live prices for a single Amazon ASIN across 11 international marketplaces, returning the cheapest and most expensive markets with USD-converted prices and spread analysis.","exampleAgentPrompt":"Where is ASIN B08N5WRWNW cheapest right now? Check all 11 Amazon marketplaces and tell me the price spread and how it compares to the US price.","exampleUseCases":[{"title":"Cross-border shopper finding best deal","prompt":"I want to buy ASIN B07XJ8C8F5 — can you check all Amazon marketplaces and tell me which country has it cheapest in USD, and how much I'd save compared to buying it on Amazon US?"},{"title":"Arbitrage opportunity scanner","prompt":"I'm looking for resale opportunities — can you check ASIN B09G9FPHY6 across all 11 Amazon marketplaces and show me the price spread and which market is cheapest vs most expensive?"},{"title":"International seller pricing strategy","prompt":"I sell on Amazon and need to know how ASIN B08C1W5N87 is priced in DE, FR, IT, ES, and UK compared to the US — pull the live prices converted to USD and tell me the spread."}],"resultDescription":"Returns a JSON object containing the product title, cheapest and most expensive marketplace objects (each with local price, currency, and USD-converted price), price spread percentage, difference vs US price percentage, a full array of all checked marketplaces with availability, price basis, sales rank, monthly sales estimate, and whether Amazon is the seller, plus FX rate metadata and notes about VAT and shipping caveats.","failureModes":["ASIN not found in any marketplace — returns zero results or empty marketplaces array","ASIN exists but is unavailable in all requested marketplaces — found_in returns 0","Invalid ASIN format (not 10 characters) — request rejected","FX rate data temporarily unavailable — may affect USD conversion accuracy","Product is region-locked and not listed in certain marketplaces — partial results returned","Payment not included or insufficient — 402 Payment Required response"],"whenToPreferThis":"Use this endpoint when you need live, multi-marketplace Amazon price comparison for a single known ASIN and want USD-normalized prices with spread analysis. Prefer this over generic price trackers when the user needs cross-border arbitrage signals, international seller intelligence, or wants to know which Amazon storefront offers the best deal right now. If the user only wants historical price trends or US-only pricing, other ASIN402 endpoints may be more appropriate.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:36:56.300Z","isFirstParty":false,"canonicalSlug":"asin402-cross-marketplace-price-comparator-5b56d007"}