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How to Manage Account Balances in Tenderly Forks

Learn how to increase account balances by desired amounts on Tenderly Forks.
If you’re using Tenderly Forks, you may need to manage the balance value of a specific account. Tenderly’s custom JSON-RPC allows you to change the balances of accounts on Tenderly Forks. In other words, you can set a specific value or increase it by a desired amount.

Set a specific balance

The code snippet below sets the balance value to 100 ETH for one or more addresses using the tenderly_setBalance custom RPC endpoint. This endpoint receives two arguments: an array of wallets and the new amount you wish to set in Wei.
When specifying BigNumberish fields to JSON-RPC endpoints in a form of a hexadecimal string, these must not contain leading zeros. Use ethers.utils.hexValue(aBigNumberish) to convert the given bigNumberish value into an acceptable form with no leading zeros.
const WALLETS = [
"0x....",
"0x....",
];
​
const result = await provider.send("tenderly_setBalance", [
WALLETS,
//amount in wei will be set for all wallets
ethers.utils.hexValue(ethers.utils.parseUnits("10", "ether").toHexString()),
]);
​

Increase the balance by a specific value

To increase the balance of specified addresses by a desired amount, use the tenderly_addBalance custom RPC endpoint.
const WALLETS = [
"0x....",
"0x....",
];
​
const result = await provider.send("tenderly_addBalance", [
WALLETS,
//amount in wei will be added for all wallets
ethers.utils.hexValue(ethers.utils.parseUnits("10", "ether").toHexString()),
]);
​

Get the current balance

To check the balance of an address, use the JSON-RPC endpoint eth_getBalance. This endpoint receives two arguments: the address and the block number (or latest).
const newBalances = await Promise.all(
WALLETS.map(async (wallet) => ({
wallet,
balance: await provider.send("eth_getBalance", [wallet, "latest"]),
}))
);
​
console.log("New balances", newBalances);