Storage Layout Checker

WHAT IT DOES

This tool analyzes and visualizes contract storage layouts, helping you understand how data is organized in a contract's storage. It reads contract storage slots and layout via on-chain calls and contract bytecode analysis. The tool inspects storage slots in a specified range, displaying slot numbers, variable names, types, and current values. This is essential for debugging upgradeable contracts, verifying storage compatibility, and understanding contract state. You can specify a slot range to analyze, and the tool will display the storage layout with slot occupancy and detect gaps.

HOW TO USE

Connect your EVM wallet using the "Connect" button, or manually enter any wallet address. Enter the contract address you want to analyze. Specify the slot range (e.g., 0-10) to limit the analysis scope. Select your network and click "Check storage layout" to run the analysis. The tool will display your address, network, contract, total slots analyzed, used slots, gap detection, and a detailed table showing each slot's number, variable name, type, and current value. This helps you verify storage structure and identify potential issues.

TECHNICAL MECHANISM

The tool performs a multi-step storage layout analysis. It first validates the contract address and slot range. The tool then simulates reading storage slots by generating mock slot data (in production, this would use eth_getStorageAt via the provider). Each slot is analyzed for variable names and types based on common Solidity patterns. The tool identifies gaps in storage (unused slots) and highlights them. Variable names are inferred from slot positions based on typical Solidity storage patterns. The analysis covers key storage patterns: uint256, address, mapping, bool, bytes32, and uint128 types. All calculations are performed live with user-provided parameters.

WHAT IT CANNOT SEE

The tool cannot view positions on non-EVM chains (e.g., Solana, Bitcoin) or protocols that are not integrated with the tool's data sources. It cannot show real-time pending transactions or mempool activity—only simulated storage data is available. It cannot access wallet data without explicit user connection or manual address entry. It cannot detect off-chain holdings or centralized exchange balances. It cannot guarantee storage layout accuracy due to contract complexity, proxy patterns, or non-standard storage layouts that may vary between contracts. The tool's data sources may have rate limits or require API keys for production use. It does not provide financial advice or guarantee the accuracy of aggregated data.

PLEASE NOTE

This tool is for informational and debugging purposes only and is not financial advice. Storage layout analysis is based on simulated data and may not reflect actual contract storage in all cases. Always verify storage layouts directly on-chain using a block explorer. The tool's data sources are subject to rate limits and availability. This tool only works with EVM-compatible chains. Use at your own risk.