Whale Transaction Alert Tool

WHAT IT DOES

Whale Transaction Alert Tool is a read-only blockchain analytics tool that monitors on-chain transaction activity for large-value native token transfers. It scans recent blocks across any supported EVM network and identifies transactions where the value exceeds a user-defined threshold in the chain's native token (ETH, BNB, MATIC, AVAX, etc.). Each alert displays the transaction hash, sender, receiver, exact value, block number, and timestamp, with links to the block explorer for deeper investigation. This tool is designed for traders, analysts, and on-chain researchers who need to track significant capital movements without relying on third-party alert services.

HOW TO USE

Select the desired EVM network from the dropdown menu (Ethereum, BSC, Polygon, Arbitrum, Optimism, Avalanche, Fantom, Base, Linea, or zkSync Era). Enter a threshold value in native tokens—for example, 1000 on Ethereum, or 10000 on BSC. Specify the number of recent blocks to scan (typically 100–500 blocks). Click "Scan for whale transactions" to begin the search. The tool will return a sorted list of all transactions exceeding the threshold, with the largest transfers displayed first. Each alert includes direct links to the transaction and address pages on the native block explorer.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to connect to the selected network via either the connected wallet's provider or a public RPC fallback. It fetches block data in parallel, with automatic chunking and halving of block ranges to accommodate RPC provider limits. When scanning, it retrieves full block data including transactions, then filters for native value transfers above the threshold. The scan uses Promise.all for concurrent block requests with a cap of 50 blocks per batch, preventing provider overload while maintaining reasonable speed. It also handles edge cases like contract creations (where "to" is null) and zero-value transactions.

WHAT IT CANNOT SEE

This tool cannot detect off-chain whale activity such as OTC trades, centralized exchange internal transfers, or cross-chain bridging operations that are not visible on the source chain. It cannot guarantee real-time notification delivery because it scans only when the user clicks the button—there is no continuous background polling or webhook integration. It is limited to native token transfers only and does not detect ERC-20 token movements, NFT transfers, or smart contract interactions that do not involve native value. The tool cannot predict future whale movements or detect patterns across multiple chains simultaneously.

PLEASE NOTE

This tool is EVM only. It supports Ethereum, Optimism, BSC, Polygon, Fantom, Arbitrum, Avalanche, Linea, zkSync Era, and Base. No Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, or XRP support. All data is read-only—no transactions are signed or sent. The scan is limited to the number of blocks specified by the user and