Batch Call Bundler

WHAT IT DOES

Batch Call Bundler is a developer-focused tool that enables bundling multiple contract calls into a single transaction, reducing gas costs and simplifying complex multi-step operations. Instead of executing contract interactions one at a time, this tool aggregates them into a single batch transaction, saving on transaction fees and ensuring atomic execution. It reads contract function signatures, validates call data parameters, estimates gas for individual calls, calculates aggregate gas requirements, and checks contract state for each target. The tool supports Ethereum, Polygon, Arbitrum, Optimism, Avalanche, BNB Chain, and Base, providing a unified interface to compose, simulate, and execute batched contract calls. This is essential for developers executing multi-step operations like approvals followed by trades, cross-contract interactions, and DeFi strategies requiring multiple function calls.

HOW TO USE

Connect your wallet using WalletConnect or a compatible browser extension. Ensure your wallet is on the network where the contract calls will execute. Select the target network from the dropdown menu. Add each contract call by entering the target address, call data in hex format, and the native value to send (if any). Click "Add call" to include additional calls in the batch. Optionally, specify a batch contract address if you have one deployed; otherwise, the tool will attempt to bundle calls using the multicall pattern. Click "Simulate batch" to estimate gas costs and verify all calls will succeed. The tool displays the total gas estimate, total native value, and a status indicator. If the simulation passes, the "Execute bundle" button appears. Click it to submit the batch transaction. The tool displays a transaction link to your chain's block explorer and logs the final gas cost using receipt.effectiveGasPrice.

ADAPTIVE BATCH AGGREGATION AND GAS OPTIMIZATION ENGINE

The core technical mechanism that distinguishes this tool is its adaptive batch aggregation and gas optimization engine. Unlike simple transaction builders that just concatenate calls, this tool implements a multi-layered bundling strategy. The engine first validates each call's target address, function signature, and parameters, ensuring all data is properly formatted. It then calculates individual gas estimates using eth_estimateGas for each call, applying an overhead multiplier to account for batch execution overhead. The engine automatically detects if a batch contract (like Multicall) is available and uses it for efficient aggregation; if not, it provides a fallback multicall encoding. The gas optimization engine also checks for call dependencies—when one call depends on the result of another, it detects this and suggests sequential execution instead of batch. The engine performs a static simulation of the entire batch using eth_call with blockTag = 'pending' to catch reverts before submission. All RPC calls are wrapped with timeout and retry logic, and the tool automatically falls back to a secondary provider if the primary endpoint fails or rate-limits, ensuring batch simulation completes even during network congestion.

WHAT IT CANNOT SEE

The tool cannot guarantee that all calls in the batch will succeed if the network state changes between bundling and execution, the gas estimation for the batch is inaccurate due to call dependencies, one of the target contracts reverts mid-batch, or the batch exceeds the block gas limit for the destination chain. It has no visibility into pending state changes from other transactions, nor can it predict how miners will order transactions in a block. The tool cannot detect if a target contract has been upgraded or changed between simulation and execution. It does not monitor transactions after execution—it is a bundling tool, not a transaction monitoring service. The tool cannot interact with non-EVM chains, private networks, or contracts that do not support standard call patterns.

PLEASE NOTE

This tool is designed exclusively for EVM-compatible blockchain networks. It supports Ethereum, Polygon, Arbitrum, Optimism, Avalanche, BNB Chain, Base, and similar chains. Non-EVM networks such as Solana, Cosmos, or Bitcoin are not supported. Always verify the contract addresses and call data before executing a batch—the tool does not validate contract safety or call correctness beyond basic simulation. The tool provides estimates only—actual fees and gas costs are determined at the time of transaction execution. Users are responsible for understanding batch execution risks, including the possibility of partial failure and increased gas costs for revert conditions.