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BestOffer
x402
BestOffer is a paid API for AI agents from bestoffer-mainnet-production.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-23).
Compares 2–5 product page URLs and returns a ranked recommendation for the best currently available offer, with price, confidence score, and reasoning.
Price / call$0.03
Success—
StatusUnknown
How this service works
Paid x402 API that compares multiple product pages and ranks the best currently available offer.
Output
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.
Example use cases
Cheapest laptop deal across retailers
“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?”
In-stock sneaker price check
“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?”
Gift shopping deal finder
“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.”
Technical details
Endpoint
POSThttps://bestoffer-mainnet-production.up.railway.app/best-offer?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urls | array | Two to five public product pages believed to represent the same product |
| product_hint | string | Optional description, model or variant the buyer actually wants |
Output
Schema · Response
{
"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
}
}Tags
x402
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