# ASIN402 Sell Score

> ASIN402 Sell Score is a paid API for AI agents from asin402.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-31).

Scores an Amazon ASIN 0-100 for selling viability based on demand, competition, price stability, review moat, and Amazon seller presence

## Facts

- Endpoint: GET https://asin402.com/api/sell-score?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/asin402-sell-score-85bda5e1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iYHtRhxcqpe7vm2pd-T6j

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-sell-score-85bda5e1
```

Example prompt: Can you score ASIN B08N5WRWNW on the US Amazon marketplace and tell me if it's worth selling — I want the opportunity score, demand, competition breakdown, and any risk flags?

## When to prefer this

Use this endpoint when you need a fast, single-number viability verdict on a specific Amazon ASIN for FBA, wholesale, or arbitrage decisions. It aggregates multiple competitive signals (demand, competition, price stability, review moat, Amazon presence) into one actionable score with plain-language risk flags, which is far more efficient than querying each signal separately. Prefer this over raw price-history or rank endpoints when the core question is 'should I sell this product?' rather than deep historical analysis.

## Known failure modes

- Invalid or malformed ASIN (not 10 characters) returns an error
- ASIN not found in the specified marketplace returns no data or error
- Unsupported marketplace domain returns an error
- Insufficient historical data for some signals may result in null component scores
- Payment not processed (402) blocks the response

## How this service works

Amazon product research: opportunity score 0-100. Is this product worth selling on Amazon? Scores an ASIN 0-100 from estimated monthly sales (demand), seller competition, whether Amazon sells it, price stability (price wars), review moat and price fit, with plain-language risk flags. For FBA product research, wholesale and arbitrage sourcing. Free sample: /api/sample/sell-score

## Output

Returns a JSON object with: an overall opportunity score (0-100) and plain-language rating (e.g. 'strong'), six component scores (demand, competition, price_fit, review_moat, amazon_penalty, price_stability), key marketplace signals (estimated monthly sales, sales rank, review count, current price, 90-day average price, Amazon-as-seller flag, out-of-stock percentage), an array of plain-language risk flags, the marketplace queried, and a data timestamp.

## 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)"
      },
      "domain": {
       "type": "string",
       "description": "Marketplace: us, uk, de, fr, jp, ca, it, es, in, mx, br. Default us"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asin": {
       "type": "string"
      },
      "flags": {
       "type": "array"
      },
      "score": {
       "type": "integer"
      },
      "title": {
       "type": "string"
      },
      "rating": {
       "type": "string"
      },
      "signals": {
       "type": "object",
       "properties": {
        "rating": {
         "type": "number"
        },
        "avg_90d": {
         "type": "number"
        },
        "new_offers": {
         "type": "integer"
        },
        "sales_rank": {
         "type": "integer"
        },
        "review_count": {
         "type": "integer"
        },
        "current_price": {
         "type": "number"
        },
        "amazon_is_seller": {
         "type": "boolean"
        },
        "out_of_stock_pct_90d": {
         "type": "integer"
        },
        "estimated_monthly_sales": {
         "type": "integer"
        }
       }
      },
      "components": {
       "type": "object",
       "properties": {
        "demand": {
         "type": "integer"
        },
        "price_fit": {
         "type": "integer"
        },
        "competition": {
         "type": "integer"
        },
        "review_moat": {
         "type": "integer"
        },
        "amazon_penalty": {
         "type": "integer"
        },
        "price_stability": {
         "type": "integer"
        }
       }
      },
      "data_as_of": {
       "type": "string"
      },
      "disclaimer": {
       "type": "string"
      },
      "marketplace": 
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asin": "0735211299",
  "flags": [],
  "score": 72,
  "title": "Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones",
  "rating": "strong",
  "signals": {
   "rating": 4.6,
   "avg_90d": 28.99,
   "new_offers": 7,
   "sales_rank": 4210,
   "review_count": 3840,
   "current_price": 24.99,
   "amazon_is_seller": false,
   "out_of_stock_pct_90d": 4,
   "estimated_monthly_sales": 600
  },
  "components": {
   "demand": 93,
   "price_fit": 90,
   "competition": 58,
   "review_moat": 10,
   "amazon_penalty": 0,
   "price_stability": 86
  },
  "data_as_of": "2026-10-26T18:40:00.000Z",
  "disclaimer": "Heuristic score from historical marketplace data. Not financial advice.",
  "marketplace": "us"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/asin402-sell-score-85bda5e1/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)