Crypto Whale Watcher

WHAT IT DOES

Crypto Whale Watcher helps you track the movement of large-value addresses on any EVM chain. Enter any wallet address and instantly see its ETH balance, transaction count, and whether it has made any large transactions (currently set at 100 ETH or more). The tool scans recent transaction history and highlights whale activity with a clear “Active” or “Inactive” status indicator. It also shows a list of all large transactions detected, including the destination address and the amount transferred, plus a summary of recent transfer events from the address. This gives you a quick, actionable view of whether an address is moving significant funds—perfect for market monitoring, due diligence, or spotting accumulation patterns.

HOW TO USE

Connect your EVM wallet (optional—the tool works read-only). Select the network from the dropdown (Ethereum Mainnet, Goerli, Sepolia, Polygon, Arbitrum, or Optimism). Enter any address (token contract or wallet) and click “watch”. The tool fetches on-chain data and displays a whale report with a status label, balance, transaction count, and a count of large transactions. If large transactions are detected, they are listed in a table with transaction hash, recipient, and value. Recent transfer events (from logs) are also shown. Use the “clear” button to reset and start a new watch. No signing or approvals required.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 via the BGWallet provider. It calls provider.getBalance() for current ETH balance, provider.getTransactionCount() for transaction count, and provider.getCode() to distinguish contracts from wallets. For transaction history, it uses provider.getHistory() to retrieve recent transactions, then filters for any with a value greater than or equal to 100 ETH (using ethers.BigNumber comparison). For transfer event logs, it scans Transfer events from the address using a chunked fetcher that automatically halves block ranges when the RPC returns a limit error—ensuring the scan completes even on public nodes with strict eth_getLogs caps. The logs are decoded by extracting sender and receiver from indexed topics and the value from the data field. All large transactions are displayed with human-readable values.

WHAT IT CANNOT SEE

This tool cannot detect whales that use multiple wallets or split large transactions into smaller amounts to avoid detection. It cannot identify exchange or custodian wallets, so you may see large movements that are just internal exchange rebalancing. It cannot read off-chain intent or prove ownership of addresses—you see the address, but not who controls it. It cannot read private transaction data or mempool activity—only confirmed on-chain transactions. Historical data is limited by the RPC provider’s archive node availability; older blocks may be unavailable. The threshold of 100 ETH is fixed for ETH native transactions and does not automatically adjust for token values or other chains.

PLEASE NOTE

Works exclusively on EVM-compatible chains: Ethereum Mainnet, Goerli, Sepolia, Polygon, Arbitrum, and Optimism. Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. This is a read-only, free analytics tool—use it for market research and monitoring, but always combine with other data sources for investment decisions. The whale indicator is based on a simple threshold and is not financial advice.