# ASIN402 Cross-Marketplace Price Comparator

> ASIN402 Cross-Marketplace Price Comparator is a paid API for AI agents from asin402.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-31).

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.

## Facts

- Endpoint: GET https://asin402.com/api/compare-marketplaces?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/asin402-cross-marketplace-price-comparator-5b56d007
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M_FpBJ0nfvkf2jvSYABzS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability asin402-cross-marketplace-price-comparator-5b56d007
```

Example prompt: 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.

## When to prefer this

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.

## Known failure modes

- 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

## How this service works

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

## Output

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.

## Request schema (JSON Schema)

```json
{
 "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"
       
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/asin402-cross-marketplace-price-comparator-5b56d007/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from asin402.com](https://www.zero.xyz/host/asin402.com/llms.txt)