# Transfer NFT

## EndPoint

```
POST api/v3/nft/transfer
```

## Header

<table><thead><tr><th>Field</th><th>Description</th><th>Example</th><th data-hidden>Type</th><th data-hidden>Required</th></tr></thead><tbody><tr><td>X-API-KEY</td><td>ApiKey</td><td>"HlkcGxbqBeaF76j4rvPaOasyfPwnkQ6B6DQ6THZWbvrAGxzEdulXQvOKLrRWZLnN"</td><td></td><td>Y</td></tr><tr><td>X-API-SIG</td><td><a href="/pages/fWczJThLhl07JhEDpFH0">ECDSA Signature</a>, pay attention the signature type,<br>sign the <a href="#compute-ecdsa-hash">ecdsa hash</a></td><td>"0xccf0a141fce2dc5cbbd4f802c52220e9e2ce260e86704d6258603eb346eefe2d<br>4a450005c362b223b28402d087f7065ea5eee0314531adf6a580fce64c25dca81c02"</td><td></td><td>Y</td></tr></tbody></table>

## Request

<table><thead><tr><th width="248.00000000000003">Query Param</th><th>Description</th><th>Example</th><th data-hidden></th><th data-hidden></th><th data-hidden></th></tr></thead><tbody><tr><td>exchange</td><td>exchangeAddress in <a href="/pages/pJJM3Uajb0yb2hPgXmFA">exchange info</a></td><td></td><td></td><td></td><td></td></tr><tr><td>fromAddress</td><td>sender address</td><td></td><td></td><td></td><td></td></tr><tr><td>fromAccountId</td><td>sender accountId</td><td>10110</td><td></td><td></td><td></td></tr><tr><td>toAddress</td><td>to address</td><td></td><td></td><td></td><td></td></tr><tr><td>toAccountId</td><td>payee accountId</td><td>10111，can set to 0 if dont have</td><td></td><td></td><td></td></tr><tr><td>token</td><td><a href="#nfttokenamountinfo">NftTokenAmountInfo</a>，transfer tokenId and amount</td><td></td><td></td><td></td><td></td></tr><tr><td>maxFee</td><td>TokenAmountInfo of <a href="/pages/8NcDvDL0pSdoRLWnGc1a">offchain fee</a>，</td><td></td><td></td><td></td><td></td></tr><tr><td>storageId</td><td>offchainId of <a href="/pages/jgw8Oa8wdrzY0preUdwW">storage Id</a></td><td>1</td><td></td><td></td><td></td></tr><tr><td>validUntil</td><td>Timestamp for transfer to become invalid, seconds</td><td><p></p><p>normally current time + 2 months</p></td><td></td><td></td><td></td></tr><tr><td>eddsaSignature</td><td><a href="/pages/ISZr4JIrBKM2AHi5blmm">eddsa signature</a><br>of the <a href="#compute-eddsa-hash">transfer eddsa hash</a></td><td></td><td></td><td></td><td></td></tr><tr><td>memo</td><td>(Optional) memo</td><td></td><td></td><td></td><td></td></tr><tr><td>payPayeeUpdateAccount</td><td><a href="/pages/TEe6lfZyi8HJ6Pw9SV6C">(Optional) transfer to pay payee updateAccount fee</a></td><td>true</td><td></td><td></td><td></td></tr><tr><td>counterFactualInfo</td><td><a href="#counterfactualinfo">(Optional) counterFactual Wallet Info</a></td><td>if it's counterFactual wallet, need pass the info</td><td></td><td></td><td></td></tr></tbody></table>

## Response

<table><thead><tr><th>Field</th><th>Description</th><th>Example</th><th data-hidden>Type</th><th data-hidden>Required</th></tr></thead><tbody><tr><td>hash</td><td>The hash identifier set by the user at the time of submission, can use this hash to get the transfer info</td><td>"0x1d923ca783<br>4dc90484fa2e<br>b611f0f0bc7e<br>741bb107007e<br>bea19ba8caea<br>b4f9d3"</td><td>string</td><td>Y</td></tr><tr><td>status</td><td>Whether the order was successfully submitted or not, please note, user may query after a while to get real process status, as most offchain requests are async processed<br>Allowable : ['received', 'processing', 'processed', 'failed']</td><td>"received"</td><td>string</td><td>Y</td></tr><tr><td>isIdempotent</td><td>Idempotent of submit transfer response, submit same transfer again idempotent will be true</td><td>"false"</td><td>boolean</td><td>Y</td></tr></tbody></table>

##

## Model

### **NftTokenAmountInfo**

Wrapper object used to describe a token associated with a certain quantity.

<table><thead><tr><th>Field</th><th>Description</th><th>Example</th><th data-hidden>Type</th><th data-hidden>Required</th></tr></thead><tbody><tr><td>tokenId</td><td>The Loopring's NFT token identifier.</td><td>32769</td><td>integer</td><td>Y</td></tr><tr><td>amount</td><td><p>The amount of the NFT</p><p> token</p></td><td>"2"</td><td>string</td><td>Y</td></tr><tr><td>nftData</td><td>The Loopring's NFT token data identifier which is a hash string of NFT token address and NFT_ID</td><td>"0xf7c932351186c3a9053f313eefa16209c018f7f1dba8aa 8ca7100400f7c31085"</td><td></td><td></td></tr></tbody></table>

### TokenAmountInfo

<table><thead><tr><th>Field</th><th>Description</th><th>Example</th><th data-hidden>Type</th><th data-hidden>Required</th></tr></thead><tbody><tr><td>tokenId</td><td>The Loopring's ERC20 token identifier.</td><td>0</td><td>integer</td><td>Y</td></tr><tr><td>amount</td><td>The amount of the ERC20 token</td><td>"100000000000000000"</td><td>string</td><td>Y</td></tr></tbody></table>

### counterFactualInfo

counterFactual Wallet Info

<table><thead><tr><th>Field</th><th>Description</th><th>Example</th><th data-hidden>Type</th><th data-hidden>Required</th></tr></thead><tbody><tr><td>walletFactory</td><td>Counter factual wallet factory contract address</td><td>"0xbbbbca6a90<br>1c926f240b89<br>eacb641d8aec<br>7aeafd"</td><td>string</td><td>Y</td></tr><tr><td>walletOwner</td><td>Counter factual wallet owner address, NOT the wallet address</td><td>"0xbbbbca6a90<br>1c926f240b89<br>eacb641d8aec<br>7aeafd"</td><td>string</td><td>Y</td></tr><tr><td>walletSalt</td><td>Salt to generate address from owner &#x26; other related info</td><td>"1"</td><td>string</td><td>Y</td></tr></tbody></table>

## Compute ECDSA hash

ECDSA hash is typedata hash

```
const message = {
    from: data.fromAddress,
    to: data.toAddress,
    tokenID: data.token.tokenId,
    amount: data.token.amount,
    feeTokenID: data.maxFee.tokenId,
    maxFee: data.maxFee.amount,
    validUntil: data.validUntil,
    storageID: data.storageId,
  };
const typedData: EIP712TypedData = {
    types: {
      EIP712Domain: [
        { name: "name", type: "string" },
        { name: "version", type: "string" },
        { name: "chainId", type: "uint256" },
        { name: "verifyingContract", type: "address" },
      ],
      Transfer: [
        { name: "from", type: "address" },
        { name: "to", type: "address" },
        { name: "tokenID", type: "uint16" },
        { name: "amount", type: "uint96" },
        { name: "feeTokenID", type: "uint16" },
        { name: "maxFee", type: "uint96" },
        { name: "validUntil", type: "uint32" },
        { name: "storageID", type: "uint32" },
      ],
    },
    primaryType: "Transfer",
    domain: {
      name: "Loopring Protocol",
      version: "3.6.0",
      chainId: chainId,
      verifyingContract: data.exchange,
    },
    message: message,
  };
```

## Compute EdDSA hash

```
const inputs = [
    new BN(ethUtil.toBuffer(request.exchange)).toString(),
    request.fromAccountId,
    request.toAccountId,
    request.token.tokenId,
    request.token.amount,
    request.maxFee.tokenId,
    request.maxFee.amount,
    new BN(ethUtil.toBuffer(request.toAddress)).toString(),
    0,
    0,
    request.validUntil,
    request.storageId,
  ];
  
const hasher = Poseidon.createHash(inputs.length + 1, 6, 53);
const hash = hasher(inputs).toString(10);
```


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