From 1afacf08e082c9f94ff542e80b5cf5d8149c540d Mon Sep 17 00:00:00 2001
From: bt3gl <1130416+bt3gl@users.noreply.github.com>
Date: Tue, 4 Oct 2022 08:31:09 -0700
Subject: [PATCH] =?UTF-8?q?=F0=9F=A5=93=20add=20function=20to=20set=20USDC?=
 =?UTF-8?q?=20balance=20by=20jambro?=
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---
 hardhat/set_usdc_balance.js | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 hardhat/set_usdc_balance.js

diff --git a/hardhat/set_usdc_balance.js b/hardhat/set_usdc_balance.js
new file mode 100644
index 0000000..ccab353
--- /dev/null
+++ b/hardhat/set_usdc_balance.js
@@ -0,0 +1,28 @@
+// function to set USDC balance of ethereum mainnet forks by @janbro
+
+
+const { ethers } = require("hardhat");
+
+async function setUSDCBalance(account, balance) {
+    const balances_index = 9;
+    const USDC_ADDRESS = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"; // ETH mainnet USDC address
+
+    // modify usdc's storage to give rich account large amount of tokens
+    const index = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256"],
+        [account, balances_index] // key, slot
+    );
+
+    await await ethers.provider.send(
+        "hardhat_setStorageAt",
+        [
+            USDC_ADDRESS,
+            index,
+            ethers.utils.hexlify(ethers.utils.zeroPad(balance.toHexString(), 32)).toString()
+        ]
+    );
+}
+
+module.exports = {
+    setUSDCBalance,
+};