JavaScript API for OpenSea: Trouble with NFT listing due to transfer calldata extraction failure

NFT
1

I’m stuck trying to list NFTs on OpenSea using their JavaScript API. Every time I run my code, I get this error: Error: API Error 400: ['Failed to extract transfer calldata']. I’m not sure what I’m doing wrong.

Here’s a simplified version of what I’m trying:

const OpenSeaPort = require('opensea-js').OpenSeaPort;
const provider = createProvider(); // assume this function exists

const seaport = new OpenSeaPort(provider, { networkName: 'mainnet' });

async function listNFT() {
  try {
    const result = await seaport.createSellOrder({
      asset: {
        tokenId: '123456789',
        tokenAddress: '0xABCDEF1234567890',
      },
      startAmount: 0.05,
      expirationTime: 0,
      accountAddress: '0x1234567890ABCDEF',
    });
    console.log('Listed successfully:', result);
  } catch (error) {
    console.error('Listing failed:', error);
  }
}

listNFT();

I’ve double-checked all the details like token ID, address, and account. What could be causing this error? Any ideas on how to fix it?

2

hey there hugo! i’ve run into similar issues before with opensea’s api. it’s a bit tricky sometimes, isn’t it? :sweat_smile:

have you tried checking if the nft you’re trying to list is actually owned by the account address you’re using? sometimes that can cause weird errors like this.

also, i’m curious - are you using the latest version of opensea-js? they’ve made some changes recently that might affect how the createSellOrder function works.

oh, and one more thing - have you tried adding a schemaName to your asset object? like this:

asset: {
  tokenId: '123456789',
  tokenAddress: '0xABCDEF1234567890',
  schemaName: 'ERC721'
},

just throwing ideas out there! let me know if any of these help or if you’ve already tried them. good luck with your project!

3

yo hugo, that error’s a pain! have u checked if ur NFT contract supports the right interface? some older ones don’t play nice with opensea’s API. also, double-check ur provider setup - might be worth trying a different one if u haven’t already. keep us posted!

4

I encountered a similar issue when working with OpenSea’s API. One potential solution is to ensure you have the correct approval settings for the NFT you’re trying to list. Sometimes, the API fails to extract transfer calldata if the NFT hasn’t been approved for trading on OpenSea.

Try adding an approval step before creating the sell order:

await seaport.approveSellOrder({
  asset: {
    tokenId: '123456789',
    tokenAddress: '0xABCDEF1234567890',
  },
  accountAddress: '0x1234567890ABCDEF',
});

This explicitly grants permission for OpenSea to handle the NFT on your behalf. If this doesn’t resolve the issue, you might want to verify the contract’s compatibility with OpenSea’s standards or consider reaching out to their support team for further assistance.