Vyper Security Scanner

WHAT IT DOES

Vyper Security Scanner is a developer tool that simulates security analysis for Vyper smart contracts. Enter your Vyper code — the tool performs a pattern-based scan for common vulnerabilities and security issues. It checks for missing @version pragmas, unchecked arithmetic operations, missing visibility decorators, selfdestruct usage, delegatecall, reentrancy patterns, array bounds issues, timestamp dependencies, and gas limits in loops. Results display the scan status, number of issues found, a security score (0-100) with a color-coded badge (Good, Medium, High, Critical), and a detailed table of issues with severity levels (Critical, High, Medium, Low) and explanations. This is essential for developers writing Vyper contracts, security researchers, or anyone learning about Vyper security best practices.

HOW TO USE

Connect your wallet using the BGWallet bridge (MetaMask or any Web3 wallet). Paste your Vyper code in the text area — include the @version pragma and your contract definitions. Click "Scan for vulnerabilities" to start the simulation. Results display the scan status, number of issues found, a security score with a color-coded badge, and a detailed table of issues with severity badges and recommendations. Each issue includes a description and actionable details to help you fix the vulnerability. This is useful for identifying common security issues before deployment.

TECHNICAL MECHANISM

The tool simulates Vyper security analysis using pattern-based scanning. It checks the code for known security anti-patterns and vulnerabilities specific to Vyper: missing @version pragma (suggests specifying the version), unchecked arithmetic (Vyper uses checked arithmetic by default, but warns about patterns), missing @external or @public decorators (functions should have explicit visibility), private variables without underscore prefix (Vyper convention), selfdestruct or suicide (critical, can destroy the contract), send without safety checks (use raw_call with gas limits), delegatecall (can lead to storage collisions), reentrancy patterns (state changes before external calls), array bounds issues (ensure indices are within bounds), block.timestamp usage (miners can manipulate timestamps), and loops with potential gas limits (ensure loop bounds are reasonable). Each finding is assigned a severity level (Critical, High, Medium, Low) and a security score is calculated. The tool does not actually compile the code or execute it — the analysis is a simulation for demonstration and educational purposes. All operations are performed client-side — no data is stored or transmitted. The tool is read-only and does not sign any transactions.

WHAT IT CANNOT SEE

The tool cannot actually detect all security vulnerabilities without a full Vyper compiler and static analysis engine — the scanning is a simulation. It cannot verify the correctness of the code against the Vyper language specification — the tool only performs pattern matching. It cannot detect complex logical errors or business logic flaws — the analysis is superficial. It cannot provide a formal security guarantee or certification — the tool is for educational purposes only. It cannot analyze deployed contracts without source code — the tool only scans the provided code. It cannot detect vulnerabilities that are unique to specific contract logic. The tool is read-only and does not sign any transactions.

PLEASE NOTE

This tool works exclusively with EVM-compatible chains for the wallet connection, but the Vyper security scan is chain-agnostic. Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported for wallet connection but the scan works for Vyper code. The tool provides a simulation — for real security analysis, use formal verification tools, professional audits, or the Vyper compiler with security flags. The tool does not store any data — all operations are performed client-side. The tool is provided as-is with no warranty or liability. Always verify security with professional audits before deployment.