Ethereum Wallet Balance notifier

Small utility to receive slack alerts when a given EVM wallet balance is low (under given threshold).

How to use

1. Create a Google Spreadsheet with two sheets
   • the first one named WalletAlerts
   • the second one named Chains
2. In the WalletAlerts sheet, create the following columns

Column	Description
Name	A friendly name for your wallet, used in the Slack notification
Address	The EVM address you want to monitor
Threshold	The threshold, in ETH unit, under which the alert will be sent
Delta	How often to send an alert: a threshold of 20 and delta of 5 will send an alert at 20, 15, 10, 5
Network	The name of the chain, corresponding to its entry in the Chains sheet
SlackHook	A valid Slack hook URL to send the alert to

3. In the Chains sheet, create the following columns

Column	Description
name	The name of the chain
explorerUrl	The Etherscan root URL, like https://etherscan.io/, used in the Slack notification
chainId	The chain identifier (e.g. 1 for mainnet / 137 for polygon)
currency	The chain main currency, used in the Slack notification

4. Fill some data
5. Get the spreadsheet ID (available in URL after https://docs.google.com/spreadsheets/d/)
6. Run the code

pnpm install
SPREADSHEET_ID=[your spreadhsheet id] ETHERSCAN_API_KEY_[NETWORK]=[your Etherscan API key] node index.js