Delegatecall Risk Explainer

WHAT IT DOES

Delegatecall Risk Explainer is a read-only tool that analyzes contracts for delegatecall usage and vulnerabilities, generating AI-powered plain-language explanations of delegatecall risks. It reads contract bytecode, delegatecall opcode usage, target contract address, function signature, storage layout compatibility, proxy pattern detection, upgradeable contract status, implementation address, access controls on delegatecall, call history, privileged function signatures, transaction history, event logs, contract creation block, and storage collision indicators. The tool then presents this data alongside an AI-generated analysis of whether the contract uses delegatecall, identifying potential risks including storage collisions, proxy vulnerabilities, and unauthorized delegatecall execution, and recommending mitigation strategies — helping you understand the risks before interacting with or relying on the contract.

HOW TO USE

Connect your wallet using the BGWallet bridge and select your target network. Enter the contract address you want to analyze. Optionally enter a contract name for reference. Click "Analyze delegatecall risk" to read on-chain contract data. The tool displays the contract address, contract name, delegatecall presence (Yes/No), access control type, and risk level (Low/Medium/High). A prominent warning banner appears if delegatecall is detected. Detailed information includes target contract, function signature, proxy pattern, implementation address, upgradeable status, storage collision risk, call history, privileged functions, and creation block. A mitigation strategy box provides specific recommendations. An AI explanation appears below the on-chain data, analyzing whether the contract uses delegatecall, identifying potential risks including storage collisions, proxy vulnerabilities, and unauthorized delegatecall execution, and recommending mitigation strategies before you interact with or rely on the contract. The wallet's own signature step still protects you — this explanation is informational only and does not replace reviewing what you approve in your wallet.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 with the provider from the BGWallet bridge to read on-chain contract data. No hardcoded contract addresses are used — you are always in control of which contract you trust. When analyzing delegatecall risks, the tool reads the contract bytecode via provider.getCode(contract), scans for the DELEGATECALL opcode (0xf4) in the bytecode, reads the target contract address from the contract's storage or call arguments, reads the function signature from the call data or bytecode, analyzes storage layout compatibility by comparing storage slots of the proxy and implementation, detects proxy patterns by scanning for known proxy opcode patterns (e.g., transparent proxy, UUPS, beacon proxy), detects upgradeable contract status by checking for proxy patterns and upgrade functions, reads the implementation address from the proxy storage slot, reads access controls on delegatecall by analyzing function modifiers (e.g., onlyOwner), reads call history by scanning event logs and transaction history, reads privileged function signatures by analyzing function selectors, reads transaction history via provider.getTransactionCount(contract), reads event logs by scanning for delegatecall-related events, reads the contract creation block via provider.getTransactionReceipt(contract), and detects storage collision indicators by comparing storage layouts. The tool fetches event logs by walking backwards in chunks and halving chunk size on failure, ensuring logs are properly read despite varying RPC limitations. The data is formatted and passed to the AI bridge via BGAI.generate() with a structured prompt that includes all the on-chain data read. The AI is instructed to analyze whether the contract uses delegatecall, identify potential risks including storage collisions, proxy vulnerabilities, and unauthorized delegatecall execution, and recommend mitigation strategies — while stating plainly that it cannot detect delegatecall risks that involve off-chain contract upgrades or logic changes, cannot guarantee that storage layouts remain compatible across upgrades, and cannot detect delegatecall vulnerabilities in contracts that use inline assembly or non-standard patterns. The AI response is capped at 1,024 tokens to ensure concise, focused delegatecall risk assessments. All computed values are guarded against negative numbers — if a storage slot or block number appears invalid, the tool flags it rather than displaying nonsensical values.

WHAT IT CANNOT SEE

This tool cannot detect delegatecall risks that involve off-chain contract upgrades or logic changes. It cannot guarantee that storage layouts remain compatible across upgrades. It cannot detect delegatecall vulnerabilities in contracts that use inline assembly or non-standard patterns. It cannot detect off-chain social engineering attacks that could lead to delegatecall exploitation. The AI explanation is generated from on-chain data only and cannot detect off-chain upgrade decisions, hidden storage layout changes, or social engineering attacks. It cannot predict whether a delegatecall vulnerability will be exploited in the future. The tool does not continuously monitor delegatecall risks; each analysis is a snapshot at the time of the lookup. It cannot detect delayed delegatecall executions, proxy upgrades, or off-chain factors. The tool does not store any data persistently; all state is in-memory and resets on reload. The AI explanation is informational and does not constitute financial advice, legal advice, or a guarantee of contract safety or protection against delegatecall vulnerabilities.

PLEASE NOTE

Delegatecall Risk Explainer works exclusively with EVM-compatible chains. It requires a Web3 wallet (MetaMask or similar) and the BGWallet bridge. Explanations are AI-generated from data the app reads on-chain — always review what you are actually signing in your wallet before approving it. Delegatecall vulnerabilities carry significant risk including storage corruption, unauthorized upgrades, and complete loss of contract funds. Use this tool as a guide only; always cross-check with independent sources and contract audits for critical decisions. This is experimental software; use at your own risk.