Chain-Specific Gas Schedule Differ

WHAT IT DOES

Chain-Specific Gas Schedule Differ analyzes smart contract bytecode to compare estimated gas costs across multiple EVM chains, helping developers understand how different gas schedules affect their contract's deployment and execution costs. It retrieves on-chain contract bytecode via eth_getCode and fetches verified source code and ABI from block explorer APIs. The tool disassembles the bytecode into its constituent opcodes, counts the frequency of each opcode, and builds a usage profile of the contract. It then applies chain-specific gas cost schedules—including Ethereum Mainnet, Optimism, BNB Chain, Gnosis, Polygon, Arbitrum, Base, and others—to estimate the total gas cost for each chain based on the contract's opcode profile. The output includes an average estimated gas cost, variance percentage across chains, a count of opcodes with differing costs, a detailed comparison table showing per-opcode cost differences across chains, and actionable recommendations for gas optimization on specific target chains.

HOW TO USE

Connect your BGWallet to the target EVM chain. Paste the address of the contract you wish to analyze. Select the target chains you want to compare using the chip selector—you can choose multiple chains to generate a comprehensive gas cost comparison. Optionally supply a GitHub repository URL to pull compiler version information and gas optimization notes for additional context. The tool fetches the contract's bytecode, performs opcode disassembly, counts opcode frequencies, and applies chain-specific gas schedules to estimate costs. Review the average gas estimate, cost variance, the detailed opcode comparison table, and the recommendations. Use the comparison to identify which chains are most cost-effective for your contract, and to guide gas optimization efforts on chains where costs are higher.

OPCODE FREQUENCY ANALYSIS AND CHAIN-SPECIFIC GAS MAPPING ENGINE

The real technical mechanism is the opcode frequency analysis and chain-specific gas mapping engine that combines bytecode disassembly with a curated database of network-specific gas schedules. The tool first disassembles the deployed bytecode into its constituent opcodes, tracking the frequency of each opcode in the contract. It then applies a weighted cost model: for each opcode, the tool multiplies its frequency by the opcode's gas cost on each target chain, summing the results to produce a total estimated gas cost for that chain. The engine uses a comprehensive gas schedule database that includes base opcode costs, EIP-1559 parameters, and chain-specific fee structures. Key opcodes with significant cost differences across chains include EXP (cheaper on some L2s), SLOAD and SSTORE (storage costs vary), and CALL-family opcodes (cross-chain call costs differ). The tool also accounts for chain-specific EIPs that affect gas costs—for example, EIP-2929 gas cost increases on Ethereum Mainnet vs. chains that haven't activated it. The final output includes a variance percentage that highlights which chains are more or less expensive, enabling developers to make informed deployment decisions. This approach provides a static estimate that, while not a substitute for runtime measurement, offers a useful baseline for comparing gas costs across chains before deployment, helping to avoid unexpected fee shocks.

WHAT IT CANNOT SEE

This tool cannot generate a complete gas schedule comparison without access to contract bytecode or source code. It is limited by your RPC provider's rate limits for bytecode retrieval, which may delay analysis on congested networks. It cannot determine actual gas usage without executing the contract—static analysis only provides estimates and may not reflect dynamic gas costs that depend on runtime conditions. The detection relies on the completeness of the ABI and source code verification; unverified contracts or incomplete verification data will produce incomplete or inaccurate results. Detection is based on bytecode pattern matching and may miss indirect or variable gas costs, such as opcodes whose gas costs depend on the current state (e.g., SLOAD cost varies if the slot was previously loaded) or memory expansion costs. The tool cannot assess runtime gas optimizations or dynamic gas costs, such as the gas refund mechanism for clearing storage. It may produce inaccurate estimates for opcodes whose gas costs vary based on runtime state—for example, the cost of a CALL depends on the amount of gas forwarded and the target contract's behavior. The tool cannot account for chain-specific gas market conditions or fee changes over time, such as variations in base fee, priority fee, or dynamic fee adjustments. It does not execute the contract to validate gas estimates, so it cannot confirm whether the estimated gas costs match actual execution costs. Gas schedules may be updated on target chains without notice, making static estimates potentially outdated.

PLEASE NOTE

This tool works exclusively with EVM-compatible chains. It requires active internet connectivity to access block explorer APIs and RPC endpoints. Some block explorers may require API keys for high-volume bytecode retrieval. The tool is read-only and does not modify or deploy any code—it only produces gas cost estimates and comparisons. Gas costs are estimates only; always test on actual networks and use transaction simulations for accurate gas estimates before deployment.