MEV Exposure Scorer for Contract Design

WHAT IT DOES

MEV Exposure Scorer for Contract Design helps developers, auditors, and protocol teams evaluate how exposed a contract is to Miner Extractable Value (MEV) attacks. You provide the contract source code, and the tool analyzes functions, external calls, state variables, and transaction patterns to identify potential MEV extraction vectors. It assigns a risk score from 0 to 100 and categorizes the contract as Low, Medium, High, or Critical based on the presence of vulnerabilities like unprotected swaps, lack of slippage protection, oracle dependency, batch operations, and low-level calls. This enables proactive mitigation before deployment.

HOW TO USE

Paste your Solidity contract source into the input area. Click "score MEV exposure". The tool runs a series of heuristic rules against the code, checking for common MEV‑related patterns. Results include a numerical score, a severity label, and a list of specific findings — each with a description and severity level. Each finding also shows its contribution to the overall score. Use this to prioritize which MEV‑resistant mechanisms to implement, such as slippage protection, commit‑reveal schemes, or private mempool integration.

THE REAL MECHANISM

The scorer uses a rule‑based engine that scans the source code for known MEV attack surfaces. It checks for external calls to unknown addresses (which may be manipulated), swap or transfer functions (common sandwich targets), slippage protection (or lack thereof), public/external function count, storage variables with user‑controlled access, payment processing, oracle usage, reentrancy patterns, batch operations, and owner privileges. Each rule contributes a configurable point value to the total score, with higher weights assigned to more critical vulnerabilities (e.g., 20 points for unprotected swaps, 15 for low‑level calls). The final score is capped at 100 and mapped to a severity level. All analysis is static — it does not simulate execution or read blockchain state.

WHAT IT CANNOT SEE

The tool cannot predict actual MEV extraction profitability, detect MEV opportunities that depend on cross‑contract interactions, identify all possible MEV attack paths, determine if MEV extraction is economically viable in real‑time, detect sandwich attacks that rely on mempool ordering, or verify that the contract's MEV exposure is actually exploitable. The score is a heuristic indication — a low score does not guarantee the contract is MEV‑resistant, and a high score may include false positives. Always combine with dynamic testing, simulation, and manual review.

PLEASE NOTE — EVM CHAINS ONLY

This tool is designed for Solidity contracts on Ethereum Virtual Machine (EVM) compatible chains. It focuses on MEV patterns common to EVM‑based AMMs, oracles, and payment systems. All processing occurs in your browser; no contract data is stored or transmitted.