# x402 Seller Wash-Trading Detection

> x402 Seller Wash-Trading Detection is a paid API for AI agents from api.x402node.dev, paid per call via x402, $4/call, status unknown (last checked 2026-09-15).

Analyzes an x402 seller's transaction history to detect wash trading, fake sales, and self-generated volume by sampling buyer wallet freshness, payment timing bursts, and wallet reuse patterns.

## Facts

- Endpoint: GET https://api.x402node.dev/x402/authenticity
- Price: $4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-seller-wash-trading-detection-b96e4397
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MA9Q8a-qG3-8jcSBcJL4u

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 x402-seller-wash-trading-detection-b96e4397
```

Example prompt: Can you run a wash-trading authenticity check on this x402 seller — their address is 0xAbC123... — and tell me whether their sales volume looks real or self-generated, including buyer wallet freshness and timing burst scores?

## When to prefer this

Use this endpoint when you need to forensically audit an x402 seller's sales authenticity and detect wash trading or inflated volume — particularly when raw revenue metrics look suspicious or you need to verify that customers are real, distinct wallets rather than self-trades.

## Known failure modes

- Invalid or non-existent seller address returns an error
- Seller with insufficient transaction history may yield low-confidence scores
- Network or RPC issues may cause timeouts
- Payment of $4 USDC required per call via x402 protocol; failure to pay returns 402

## How this service works

Deep wash-trading detection for an x402 seller - samples buyer wallets for freshness, analyses payment timing bursts and wallet reuse to score how likely the seller's sales are self-generated fakes vs real distinct customers - the forensic layer beyond raw revenue, exposing inflated volume that fools everyone else. wash trading detection, fake sales, self trading, x402 authenticity, real customers check, sales fraud detection

## Output

Returns a forensic authenticity score indicating the likelihood that a seller's x402 sales are wash-traded or self-generated, including analysis of buyer wallet freshness, payment timing bursts, and wallet reuse patterns to distinguish real distinct customers from fake volume.

## 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": [
      "address"
     ],
     "properties": {
      "payTo": {
       "type": "string",
       "description": "Payee address to analyze (optional)"
      },
      "address": {
       "type": "string",
       "description": "x402 payTo address to forensically analyze (required)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-seller-wash-trading-detection-b96e4397/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)