# NFT Wash-Trade Check

> NFT Wash-Trade Check is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Analyzes a specific NFT token's sales history for wash-trading patterns, returning a verdict and supporting evidence

## Facts

- Endpoint: GET https://x402.professorsausages.com/nft/:chain/asset/:address/:tokenId/wash-check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nft-wash-trade-check-225dd0d6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lxQl1QxxjdDAjuDZC_pkF

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 nft-wash-trade-check-225dd0d6
```

Example prompt: Can you check if token #4231 of the NFT contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13d on Ethereum has been wash traded? I want to know if its sales history looks manipulated.

## When to prefer this

Use this endpoint when you need per-token wash-trade analysis for a specific NFT, rather than collection-level statistics. Ideal for due diligence before purchasing an NFT, investigating suspicious price history, or flagging market manipulation on a particular asset. The 24h cache makes it efficient for repeated lookups on the same token.

## Known failure modes

- Invalid or unsupported chain identifier returns an error
- Contract address not found or not an NFT contract
- Token ID does not exist on the given contract
- No sales history available for the token — verdict may be inconclusive
- Payment not received or insufficient — 402 response
- Cache miss on first call may increase latency slightly

## How this service works

Per-token wash-trade heuristics: verdict + evidence over that token's sales — cached ≤24h

## Output

Returns a wash-trade verdict (e.g. clean, suspicious, flagged) along with evidence derived from the token's sales history, such as circular trading patterns, repeated buyer-seller pairs, and price anomalies. Results are cached for up to 24 hours.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nft-wash-trade-check-225dd0d6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.professorsausages.com](https://www.zero.xyz/host/x402.professorsausages.com/llms.txt)