{"uid":"cap_dxstT08tPoKf9p2penCp-","slug":"bestoffer-9c7bace1","name":"BestOffer","description":"Paid x402 API that compares multiple product pages and ranks the best currently available offer.","url":"https://bestoffer-mainnet-production.up.railway.app/best-offer?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"urls":{"type":"array","items":{"type":"string","format":"uri"},"maxItems":5,"minItems":2,"description":"Two to five public product pages believed to represent the same product"},"product_hint":{"type":"string","description":"Optional description, model or variant the buyer actually wants"}}},"responseSchema":{"type":"json","example":{"reason":"Seller 2 is in stock and has the lowest visible delivered price.","product":"Example Product","currency":"GBP","best_price":79.99,"comparable":true,"confidence":0.94,"best_offer_index":1}},"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_hRPaidJ0HxsamxCpTL7xr","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 2–5 product page URLs and returns a ranked recommendation for the best currently available offer, with price, confidence score, and reasoning.","exampleAgentPrompt":"I found the same Sony WH-1000XM5 headphones on three different sites — can you compare these pages and tell me which one has the best deal right now? Here are the URLs: https://www.amazon.co.uk/..., https://www.johnlewis.com/..., https://www.currys.co.uk/...","exampleUseCases":[{"title":"Cheapest laptop deal across retailers","prompt":"I'm looking at the MacBook Air M3 on four different sites — Amazon, John Lewis, Argos, and Apple's own store. Can you compare these pages and tell me which one is cheapest with delivery included right now?"},{"title":"In-stock sneaker price check","prompt":"I want to buy the Nike Air Max 270 in size 10 but I'm not sure which of these three pages actually has it in stock at the best price — can you rank them for me?"},{"title":"Gift shopping deal finder","prompt":"I found the LEGO Technic Bugatti on two sites and I want to give it as a gift — compare these two product pages and tell me which seller has the better offer today, including delivery cost."}],"resultDescription":"Returns a JSON object containing: the index of the best offer (best_offer_index), the best visible delivered price (best_price) and its currency, the product name inferred from the pages (product), a human-readable explanation of why that offer is best (reason), a flag indicating whether the pages are genuinely comparable (comparable), and a confidence score (0–1) reflecting certainty in the recommendation.","failureModes":["URLs are not publicly accessible or require login — scraping fails and comparison cannot be made","Product pages represent different products or variants — comparable flag set to false","Fewer than 2 or more than 5 URLs provided — request rejected by schema validation","Price information not visible on the page (e.g. 'add to cart to see price') — confidence score will be low or result may be unavailable","Payment of $0.03 USDC fails or is not submitted — 402 response returned before processing begins","All pages are out of stock — recommendation may still be returned but with low confidence"],"whenToPreferThis":"Use BestOffer when you have 2–5 concrete product page URLs that likely represent the same item and want a fast, automated determination of which is the best deal right now, including stock availability and delivered price. It is especially useful when prices vary by retailer or region and a human-readable explanation of the recommendation is needed. Prefer this over manual scraping pipelines or generic search when you already have the candidate URLs and want a single ranked answer with a confidence score.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T12:32:09.405Z","isFirstParty":false,"canonicalSlug":"bestoffer-9c7bace1"}