Transfer NFT

Send NFT to another account on Loopring L2

Step 1: Get account Info

Prepare Loopring Layer2 account. Retrieve account information.

const { exchangeInfo } = await LoopringAPI.exchangeAPI.getExchangeInfo();
const LOOPRING_EXPORTED_ACCOUNT.exchangeAddress =  exchangeInfo;
const { accInfo } = await LoopringAPI.exchangeAPI.getAccount({
  owner: LOOPRING_EXPORTED_ACCOUNT.address,
});

Step 2: Get eddsaKey

Generate EdDSA key

const eddsaKey = await signatureKeyPairMock(accInfo);
console.log("eddsaKey:", eddsaKey.sk);

Step 3: Get apiKey

Retrieve the account's API key.

const { apiKey } = await LoopringAPI.userAPI.getUserApiKey({
  accountId: accInfo.accountId}, eddsaKey.sk
);
console.log("apiKey:", apiKey);
const { userNFTBalances } = await LoopringAPI.userAPI.getUserNFTBalances(
  { accountId: accInfo.accountId, limit: 20 },
  apiKey
);

Step 4: Get storageId

Get NFT tokenId's storageId

const storageId = await LoopringAPI.userAPI.getNextStorageId({
  accountId: accInfo.accountId,
  sellTokenId: LOOPRING_EXPORTED_ACCOUNT.nftTokenId,
}, apiKey);

Step 5: Get fee

Get transfer NFT fee

const fee = await LoopringAPI.userAPI.getNFTOffchainFeeAmt({
  accountId: accInfo.accountId,
  requestType: sdk.OffchainNFTFeeReqType.NFT_TRANSFER,
  amount: "0",
}, apiKey);
console.log("fee:", fee);

Step 6: Transfer NFT

Transfer the NFT. Requires the EdDSA key to sign

const transferResult = await LoopringAPI.userAPI.submitNFTInTransfer({
  request: {
    exchange: LOOPRING_EXPORTED_ACCOUNT.exchangeAddress,
    fromAccountId: LOOPRING_EXPORTED_ACCOUNT.accountId,
    fromAddress: LOOPRING_EXPORTED_ACCOUNT.address,
    toAccountId: 0, // toAccountId is not required, input 0 as default
    toAddress: LOOPRING_EXPORTED_ACCOUNT.address2,
    token: {
      tokenId: LOOPRING_EXPORTED_ACCOUNT.nftTokenId,
      nftData: LOOPRING_EXPORTED_ACCOUNT.nftData,
      amount: "1",
    },
    maxFee: {
      tokenId: TOKEN_INFO.tokenMap["LRC"].tokenId,
      amount: fee.fees["LRC"].fee ?? "9400000000000000000",
    },
    storageId: storageId.offchainId,
    validUntil: LOOPRING_EXPORTED_ACCOUNT.validUntil,
  },
  web3,
  chainId: sdk.ChainId.GOERLI,
  walletType: sdk.ConnectorNames.Unknown,
  eddsaKey: eddsaKey.sk,
  apiKey,
});
console.log("transfer Result:", transferResult);

Congratulations! You have successfully transferred an NFT on Loopring Layer 2!