# NFT Collection Wash-Trade Check

> NFT Collection Wash-Trade Check is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Analyzes an NFT collection for wash-trading patterns using heuristic rules over recent sales, returning a verdict and per-rule evidence

## Facts

- Endpoint: GET https://x402.professorsausages.com/nft/:chain/collection/:address/wash-check
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nft-collection-wash-trade-check-ee191b2b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xAIMEBzQ_HyetPCuimirW

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-collection-wash-trade-check-ee191b2b
```

Example prompt: Can you check if this NFT collection at address 0xAbCd1234... on Ethereum is wash trading — I want to see the verdict and the specific rule evidence flagged against it?

## When to prefer this

Use this endpoint when you need a fast, structured wash-trade risk signal for a specific NFT collection on EVM chains, particularly when you want per-rule breakdown rather than a single opaque score. Prefer this over manual inspection or generic token checks when evaluating NFT project legitimacy before a purchase or listing decision.

## Known failure modes

- Invalid or unrecognized chain identifier returns an error
- Contract address not found or not an NFT collection returns empty or error
- Collection has fewer than the minimum required sales for meaningful analysis
- Rate limits or upstream RPC failures cause timeout
- Payment not fulfilled results in 402 response

## How this service works

Collection wash-trade heuristics: verdict + per-rule evidence over ≤300 recent sales (window cached ≤24h, verdict computed fresh)

## Output

Returns a wash-trade verdict (clean/suspicious/flagged) plus per-rule evidence derived from up to 300 recent sales; verdict is computed fresh at call time while the underlying sales window data is cached up to 24 hours

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nft-collection-wash-trade-check-ee191b2b/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)