# Wash Trading Check

> Wash Trading Check is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-20).

Analyzes a token's on-chain transfer events to detect wash trading and circular volume patterns, classifying the token as clean, elevated, or likely_wash with top round-tripper addresses identified.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/wash-trading?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wash-trading-check-ca524fe9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eW43rZmL4VzNP1BGuBowD

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 wash-trading-check-ca524fe9
```

Example prompt: Can you check if the token at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 has suspicious wash trading activity over the last 7 days — I want to know if its volume looks real or manufactured.

## When to prefer this

Use this endpoint when you need a fast, heuristic signal about whether a token's transfer volume has wash trading characteristics before trading or listing decisions. It is preferable over raw block explorer lookups when you want a pre-computed classification and ranked round-tripper list rather than raw event data. Pair with Volume Authenticity Check for corroborating signals. Not suitable as sole evidence of manipulation — treat the output as a risk sizing input.

## Known failure modes

- Invalid or non-existent token contract address returns an error
- Days parameter exceeding 30 causes a validation error
- Token with insufficient transfer history may return inconclusive results
- Legitimate LP and router addresses may inflate round-trip signals causing false positives
- Network congestion or RPC issues may cause timeouts

## How this service works

Hot volume is often fake. This reads a token's transfer events and flags the wash/circular shape: the share of transfers round-tripping through addresses active on BOTH the send and receive side, plus participant concentration. Returns clean / elevated / likely_wash with the top round-trippers. A heuristic signal, not proof — LPs and routers legitimately sit on both sides — so size off it, don't convict on it. Pass days= (default 7). Not financial advice.

## Output

Returns a classification label (clean, elevated, or likely_wash), the share of transfers identified as round-tripping through addresses active on both send and receive sides, a participant concentration metric, and a list of the top addresses involved in circular transfer patterns. The result is a heuristic signal intended for risk sizing, not definitive proof of manipulation.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "days": {
       "type": "string",
       "description": "Window days (default 7, max 30)"
      },
      "address": {
       "type": "string",
       "description": "Token contract address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wash-trading-check-ca524fe9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)