> ## Documentation Index > Fetch the complete documentation index at: https://docs.etherscan.io/llms.txt > Use this file to discover all available pages before exploring further. # Introduction Etherscan is the leading blockchain explorer, search, API, and analytics platform for Ethereum and other EVM-compatible chains. With Etherscan API V2, we've unified all 60+ [supported chains](/supported-chains) under a single account and API key system. Your app becomes multichain 🌈 simply by updating the `chainid` parameter to support BNB Smart Chain (BSC), Base, Arbitrum, HyperEVM, and more. ## Start Building Check for USDC/USDT/PYUSD token transfers to an address. Analyze the largest holders of YieldBasis(Ethereum), Aster(BNB) and other newly launched tokens. List all token balances for an address, across chains. Get name tags and labels associated with an address, such as exchange deposits "Coinbase 10".