Optimism WETH Batch Sender

WHAT IT DOES

Optimism WETH Batch Sender is a focused DeFi tool that takes a list of recipient addresses, corresponding WETH amounts, and a WETH token contract address, then constructs a single batched transaction that sends WETH to all recipients in one go. Instead of submitting separate transfers for each address, this tool aggregates them into a single contract call, dramatically reducing the gas overhead and manual effort required for bulk distributions, airdrops, payroll, or reward payouts on the Optimism network. The user provides the input data, the tool builds the transaction payload, and the user signs and broadcasts it through their connected wallet. The tool itself does not hold funds or execute anything autonomously.

HOW TO USE

Connect your Web3 wallet (MetaMask, WalletConnect, or any standard EVM-compatible wallet) to the Optimism network. Paste or upload your list of recipient addresses and the corresponding WETH amounts (in wei or decimal format). Enter the WETH token contract address for Optimism (the tool does not auto-detect it). Review the summary of recipients and total WETH to be sent. Click the batch send button, review the transaction in your wallet, confirm the gas fee, and sign. The wallet broadcasts the batched transaction to the Optimism network. After confirmation, all transfers are executed atomically in the order provided.

MECHANISM: BATCHED TRANSFER CONSTRUCTION

The tool dynamically encodes the WETH transfer function signature (transfer(address,uint256)) for each recipient and amount pair. It then constructs a batch contract call by interacting with a minimal proxy contract or directly through a multicall-style aggregation, depending on the WETH contract's support. The tool builds the calldata sequentially, concatenating each transfer call into a single transaction payload. It calculates the total gas requirement by estimating each transfer call individually and summing them with a safety buffer, then presents this estimate to the user before signing. The transaction is submitted as a single atomic operation—either all transfers succeed or the entire batch reverts. This mechanism ensures that the batch is processed in the exact order specified and that gas costs are amortized across all recipients, making it significantly cheaper than individual sends.

WHAT IT CANNOT SEE

This tool reads no on-chain data directly. It does not verify that recipient addresses are valid or that the sender has sufficient WETH balance before signing. It cannot guarantee that all transfers will succeed—if one transfer fails (e.g., recipient contract reverts, blacklisted address, or WETH transfer restrictions), the entire batch will revert. It cannot detect if the WETH contract has paused transfers, if the provided contract address is incorrect or inactive, or if the sender has enough native ETH for gas. It does not account for gas price fluctuations during the batch execution or provide fallback mechanisms for mid-batch failures. It cannot ensure that the batch order is preserved if the network reorders transactions, though atomicity guarantees all-or-nothing execution. It does not verify that the WETH token contract is the canonical Optimism WETH or that recipients are not blacklisted.

PLEASE NOTE

This tool works exclusively on EVM-compatible chains, with Optimism as the primary target. It requires the user to have sufficient native ETH for gas and sufficient WETH balance to cover the total amount sent. The user is solely responsible for verifying the WETH contract address, recipient addresses, and amounts before signing. Always test with a small batch first.