johngrantuk’s gists

johngrantuk / SwapSingleToEth.s.sol

Created December 11, 2025 10:06

Forge Script - Balancer V3 Swap To Native

	// SPDX-License-Identifier: MIT
	pragma solidity ^0.8.22;

	import "forge-std/Script.sol";
	import {console} from "forge-std/console.sol";
	import {IRouter} from "@balancer-v3-monorepo/interfaces/vault/IRouter.sol";
	import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
	import {IPermit2} from "@permit2/interfaces/IPermit2.sol";

	// forge script --chain mainnet script/SwapSingleToEth.s.sol:SwapSingleToEth --rpc-url http://localhost:8545 -vvvv

johngrantuk / swap.integration.test.ts

Created December 10, 2025 16:18

V3 Swap, Native Out, Local Fork

	// pnpm test ./test/entities/swaps/v3/swap.integration.test.ts
	import { config } from 'dotenv';
	config();
	import {
	Address,
	createTestClient,
	http,
	publicActions,
	walletActions,
	TestActions,

johngrantuk / zeKrakenExample.ts

Created June 26, 2025 11:55

Shows how to fetch list of pool addresses from API, filter out specific address then query API for SOR paths.

	/**
	*
	* Run with:
	* pnpm example ./examples/swaps/zeKrakenExample.ts
	*/
	import { Address } from 'viem';
	import {
	BalancerApi,
	API_ENDPOINT,
	ChainId,

johngrantuk / balanceTracking-28-04-25.ts

Created April 29, 2025 08:47

Confirm balance tracking works via events

	// pnpm example ./examples/balanceTracking-28-04-25.ts
	// Checks events for pool: https://balancer.fi/pools/base/v3/0xaf5b7999f491c42c05b5a2ca80f1d200d617cc8c
	import { Address, createPublicClient, http, parseAbiItem, Log } from 'viem';
	import { base } from 'viem/chains';
	import fs from 'fs';
	import path from 'path';

	// Define event signatures
	const swapEvent = parseAbiItem(
	'event Swap(address indexed pool, address indexed tokenIn, address indexed tokenOut, uint256 amountIn, uint256 amountOut, uint256 swapFeePercentage, uint256 swapFeeAmount)',

johngrantuk / balanceTracking.ts

Created April 11, 2025 14:14

balanceTracking

	// pnpm example ./examples/balanceTracking.ts
	import { Address, createPublicClient, http, parseAbiItem, Log } from 'viem';
	import { base } from 'viem/chains';
	import fs from 'fs';
	import path from 'path';

	// Define event signatures
	const swapEvent = parseAbiItem(
	'event Swap(address indexed pool, address indexed tokenIn, address indexed tokenOut, uint256 amountIn, uint256 amountOut, uint256 swapFeePercentage, uint256 swapFeeAmount)',
	);

johngrantuk / SwapExample.ts

Created December 20, 2022 11:14

	/**
	* Example showing how to find a swap for a pair using SOR directly
	* - Path only uses swaps: use queryBatchSwap on Vault to see result
	* - Path use join/exit: Use SDK functions to build calls to submit tx via Relayer
	*/
	import dotenv from 'dotenv';
	import { BigNumber, parseFixed } from '@ethersproject/bignumber';
	import { Wallet } from '@ethersproject/wallet';
	import { AddressZero } from '@ethersproject/constants';
	import {

johngrantuk / exchange-gas-costs.ts

Last active November 17, 2020 15:26

	// Example using Etherscan API to analyse contract gas usage over time period.
	// And .env file with ETHERSCAN API key. Free key from: https://etherscan.io/myapikey.
	require('dotenv').config();
	const moment = require('moment');
	const axios = require('axios').default;
	const Decimal = require('decimal.js');

	export const BONE = new Decimal(10).pow(18);

	// Returns all transactions for block range

johngrantuk / transactionDetails.ts

Created November 17, 2020 11:42

Example showing how to get tx info from tx hash using ethers.js

	// Example showing how to get tx info from tx hash using ethers.js
	// Add .env file with INFURA key. Free key from: https://infura.io/
	require('dotenv').config();
	import { JsonRpcProvider } from '@ethersproject/providers';
	import { Interface } from '@ethersproject/abi';

	async function getTransactionDetails(){

	let txHash = `0x4b55c0b756dbfbcd997e94b98698241299d16d5297cd17aa463d280d215a1f52`; // Example tx hash from Etherscan

johngrantuk / txParsing.js

Last active November 5, 2020 16:19

	// npm add @ethersproject/abi
	import { Interface } from '@ethersproject/abi';

	function transactionParsing(){

	console.log(`transactionParsing`);

	const proxyArtifact = require('./abi/ExchangeProxy.json'); // See below

	const iface = new Interface(proxyArtifact.abi);

johngrantuk / ExampleEtherscan.ts

Created October 8, 2020 15:36

	require('dotenv').config();
	var moment = require('moment');
	const axios = require('axios').default;
	const Decimal = require('decimal.js');

	export const BONE = new Decimal(10).pow(18);

	// Returns all transactions for block range
	export async function fetchTransactions(startBlock, endBlock) {
	const proxyAddr = `0x6317C5e82A06E1d8bf200d21F4510Ac2c038AC81`;

John Grant johngrantuk