NFT Floor Wash Trade Detector

x402

NFT Floor Wash Trade Detector is a paid API for AI agents from api.chainmarket-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Detects wash trading activity in an ERC-721 NFT collection by analyzing recent transfer round-trips on Ethereum

Price / call$0.002

Seller volume →—

Success—

StatusUnknown

How this service works

ERC-721 collection activity on Ethereum from Blockscout: name, holder count, supply and the newest 50 transfers, with round-trip transfers (a token sent A to B and straight back to A) flagged as possible wash signals. No sale prices, floor price or royalties: this source does not provide them.

Output

Returns the collection name, symbol, contract address, total supply, holders count, a sample of recent transfers with sender/receiver/tokenId/timestamp/txHash, detected round-trip pairs with the wallet addresses involved and transaction hashes, and a total round-trip count — all sourced from Blockscout's Ethereum API.

Example use cases

NFT project due diligence before purchase

“Before I buy into this NFT project, can you check the contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D for wash trading? I want to know if the floor price might be artificially inflated by round-trip transfers.”

Flagging suspicious floor price pump

“This NFT collection's floor shot up overnight — can you run a wash trade check on the contract 0x60E4d786628Fea6478F785A6d7e704777c86a7c6 and tell me how many round-trip transfers you find?”

On-chain compliance audit for NFT marketplace

“I need to audit this ERC-721 contract at 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB for wash trading patterns — pull the recent transfers and flag any addresses doing circular trades back and forth.”

Technical details

Endpoint

GEThttps://api.chainmarket-api.workers.dev/api/crypto/nft-floor-wash-detector?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need on-chain evidence of wash trading in a specific Ethereum ERC-721 NFT collection without signing up for an analytics platform. It's ideal for due diligence before purchasing NFTs, auditing marketplace listings for price manipulation, or compliance checks — particularly when you want raw round-trip transfer data with transaction hashes rather than a derived score from a third-party oracle.

Side effects

Invalid or non-ERC-721 contract address returns an error
Contract address with no transfer history returns empty transfers array
Rate limiting or Blockscout upstream unavailability causes timeout
Malformed address (not 0x + 40 hex) rejected at input validation
Payment failure results in no charge and no response

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "name": "BoredApeYachtClub",
    "type": "ERC-721",
    "source": "https://eth.blockscout.com/api/v2/tokens/0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D/transfers",
    "symbol": "BAYC",
    "address": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
    "checkedAt": "2026-10-23T09:35:54.648Z",
    "transfers": [
      {
        "to": "0x28dDa46BdC0aEB3b4E58E6A9A3774875729367a0",
        "from": "0xE445283D46D814aF9AB554D5afb40aFB28b91935",
        "tokenId": "948",
        "timestamp": "2026-10-23T08:49:47.000000Z",
        "transactionHash": "0x078d40f50a0b7927753a9477e15f80ce87056b2f0eb2a84775ad6f330ce5430a"
      },
      {
        "to": "0x28dDa46BdC0aEB3b4E58E6A9A3774875729367a0",
        "from": "0xE445283D46D814aF9AB554D5afb40aFB28b91935",
        "tokenId": "7510",
        "timestamp": "2026-10-23T08:49:23.000000Z",
        "transactionHash": "0x8e142162d32398c2afcee6c35b57c1fd2c8009a3da0acdb1471b1fdb77eed67d"
      }
    ],
    "roundTrips": [
      {
        "between": [
          "0x29469395eAf6f95920E59F858042f0e28D98a20B",
          "0x1a1660e7d83B3B2e047fb0f26A159F9dd9dCb486"
        ],
        "newerTx": "0x9f4c3a90e57480839f34e5e0bc1146e9340101e3510976e61450c4e8a7f803a9",
        "olderTx": "0xfbff10b9d94ec07e96729d805df1d84fe4c3084153afe23f3e156988ea699d07",
        "tokenId": "2627"
      },
      {
        "between": [
          "0x1a1660e7d83B3B2e047fb0f26A159F9dd9dCb486",
          "0x29469395eAf6f95920E59F858042f0e28D98a20B"
        ],
        "newerTx": "0xfbff10b9d94ec07e96729d805df1d84fe4c3084153afe23f3e156988ea699d07",
        "olderTx": "0x2328e2a1ba3cbf80cac682976f5f7c9d186b0ff73f710860ddea6afba24b3277",
        "tokenId": "2627"
      }
    ],
    "totalSupply": 10000,
    "holdersCount": 8245,
    "roundTripCount": 5,
    "transfersChecked": 50
  }
}

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