Whats the best way of capturing WETH details as part of a NFT trade?

jimbobbins · January 16, 2023, 2:37pm

Atm we successfully capture all ETH trade details by looking at transaction.value but a Transfer Event for a given NFT.

WETH is becoming a much bigger settle layer for NFT trading and we would like to capture the WETH value during a trade as well.

What would be the best way of doing this?

Would I need to index all WETH transactions and then in match them up to NFT Transfer transactions?

schmidsi · January 16, 2023, 10:05pm

This is the main use-case behind the TransactionReceipt feature.

Read here how to activate them: Creating a Subgraph - The Graph Docs

In the AssemblyScript API it is documented how this data is exposed: AssemblyScript API - The Graph Docs

I know there was someone that did something similar already but I can’t find the source right now. I’ll check.

itsjerryokolo · January 17, 2023, 7:04am

github.com

franz101/mev-explore-subgraph/blob/main/src/mapping.ts

import {
  Arb,
  LastArb,
  Bot,
  ArbSignature,
  UsedSmartContract,
} from "../generated/schema";
import { Bytes, BigInt, ethereum, log } from "@graphprotocol/graph-ts";

//Inspiration:
//https://etherscan.io/tx/0x5be636bbfef47c29a2b571f0858bfed0672200e3bb56b61c2a305737e2d9baeb#eventlog

//Start Weth Transfer Topic 1 (bot)
//End Weth Transfer Topic 2 (bot)

const MIN_TRANSFER_COUNT = 6;
const MAX_TRANSFER_COUNT = 22;
const WETH_ADDRESS = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2";

const checkLogCount = (logCount: number): boolean => {

This file has been truncated. show original

This repo shows how it’s used.

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Whats the best way of capturing WETH details as part of a NFT trade?

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