I am working with the web3.js library on a small project that subscribes to events on a smart contract for an NFT to track all sales on that project through OpenSea. This is working fine when the sale is completed using ETH, but when a sale is made using another form of payment (USDC, DAI, WETH, etc) that OpenSea offers, the value on the transaction from web3.js is coming back as 0, and it shows 0 on etherscan.io as well. Here is an example transaction representing this issue: https://etherscan.io/tx/0x17f050e3fb6d8f0bbb4d9b4e8cd477f8197a87a3a68b360a60a028d7b1037532. Any ideas on how to get the correct value, no matter what type of currency is used?
Ex of
web3.eth.getTransaction('0x17f050e3fb6d8f0bbb4d9b4e8cd477f8197a87a3a68b360a60a028d7b1037532').then((response) => {
console.log(response);
});
Response
{
accessList: [],
blockHash: '0x6140d3cb5c271fb351e0a6e9e35b32cf0607ad526152f40f2d98107a97b0212b',
blockNumber: 13545512,
chainId: '0x1',
from: '0x3F4D7b0Eba8CB40D94713023d9Dc02FdB0a5169C',
gas: 391246,
gasPrice: '157998874325',
hash: '0x17f050e3fb6d8f0bbb4d9b4e8cd477f8197a87a3a68b360a60a028d7b1037532',
input: '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',
maxFeePerGas: '201893464202',
maxPriorityFeePerGas: '1500000000',
nonce: 19,
r: '0x4c8e6fbe4a49439d957e0e725f3f7e897329557a972863143ff2a34458ab190',
s: '0x25afd4caa4cdc1f93923b5f41a89bc191d0e52c27a36e51e3015ed08560fea5d',
to: '0x7Be8076f4EA4A4AD08075C2508e481d6C946D12b',
transactionIndex: 328,
type: 2,
v: '0x1',
value: '0'
}
You can get the transaction receipt containing event logs. In this case, you're looking for the Transfer event emitted by the ERC-20 contract, where the ERC-20 token sender is the same as the NFT receiver.
const run = async () => {
const receipt = await web3.eth.getTransactionReceipt('0x17f050e3fb6d8f0bbb4d9b4e8cd477f8197a87a3a68b360a60a028d7b1037532');
const nftReceiver = _getNFTReceiver(receipt.logs);
for (let log of receipt.logs) {
// keccak256 of "Transfer(address,address,uint256)"
if (log.topics[0] === '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'
// ERC20 sender (1st param of the Transfer event) is the same as the NFT receiver
&& web3.eth.abi.decodeParameter('address', log.topics[1]).toLowerCase() === nftReceiver.toLowerCase()
// ERC-20 Transfer returns the value in `data`, while ERC-721 has the same signature but returns empty data
&& log.data !== '0x'
) {
console.log('ERC-20 token contract: ', log.address);
console.log('ERC-20 token amount (incl. decimals): ', web3.eth.abi.decodeParameter('uint256', log.data));
}
}
}
const _getNFTReceiver = (logs) => {
for (let log of logs) {
// keccak256 of "Transfer(address,address,uint256)"
if (log.topics[0] === '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'
// ERC-20 Transfer returns the value in `data`, while ERC-721 has the same signature but returns empty data
&& log.data === '0x'
) {
// 2nd parameter of the `Transfer()` event contains the NFT receiver
return web3.eth.abi.decodeParameter('address', log.topics[2]);
}
}
return null;
}
run();
prints:
Token contract: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Token amount (incl. decimals): 6000000000