Denial of Service Risk Explainer

WHAT IT DOES

Denial of Service Risk Explainer is a read-only tool that analyzes contracts and transactions for denial of service (DoS) vulnerabilities, generating AI-powered plain-language explanations of DoS risks. It reads contract bytecode, gas consumption patterns, unbounded loop indicators, array iteration patterns, external call gas drain patterns, reentrancy indicators, resource exhaustion patterns, transaction gas limits, block gas limits, network congestion, state storage patterns, contract function accessibility, historical transaction patterns, attack surface indicators, and known vulnerability signatures. The tool then presents this data alongside an AI-generated analysis of DoS vulnerabilities, identifying potential attack vectors (e.g., unbounded loops, griefing, resource exhaustion), and recommending mitigation strategies — helping you protect your contracts and transactions from denial of service attacks before deployment or execution.

HOW TO USE

Connect your wallet using the BGWallet bridge and select your target network. Enter a contract address or transaction hash you want to analyze. Optionally enter a function name (e.g., "processBatch") for more targeted analysis. Click "Analyze DoS risk" to read on-chain contract data. The tool displays the target address, function name, attack vector, DoS risk level (Low/Medium/High), and unbounded loop risk. Detailed information includes gas consumption pattern, array and iteration vulnerability, external call drain, reentrancy indicators, resource exhaustion, storage pattern, function accessibility, attack surface, and known vulnerability signatures. A mitigation strategy box provides specific recommendations. An AI explanation appears below the on-chain data, analyzing the contract or transaction for denial of service vulnerabilities, identifying potential attack vectors, and recommending mitigation strategies before you deploy a contract or execute a transaction. 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 DoS risks, the tool reads the contract bytecode via provider.getCode(target), analyzes gas consumption patterns by simulating function calls and profiling gas usage, detects unbounded loop indicators by scanning the bytecode for loop patterns without fixed bounds, detects array iteration patterns by analyzing storage and calldata access patterns, detects external call gas drain patterns by counting external calls in the bytecode, detects reentrancy indicators by analyzing call patterns, detects resource exhaustion patterns by analyzing gas consumption relative to block gas limits, reads transaction gas limits from the transaction object, reads block gas limits via provider.getBlock(), reads network congestion from the pending transaction count, analyzes state storage patterns by reading storage slots, checks contract function accessibility by analyzing function modifiers and visibility, reads historical transaction patterns by scanning past transactions, assesses attack surface indicators by counting public/external functions, and checks known vulnerability signatures against a database of common DoS patterns. 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 the contract or transaction for denial of service vulnerabilities, identify potential attack vectors, and recommend mitigation strategies — while stating plainly that it cannot detect denial of service vulnerabilities that depend on off-chain conditions or social engineering, cannot predict future gas cost changes due to hard forks or EIPs, and cannot guarantee that a contract is free from DoS vulnerabilities even if none are detected. The AI response is capped at 1,024 tokens to ensure concise, focused DoS risk assessments. All computed values are guarded against negative numbers — if a gas limit or loop count appears invalid, the tool flags it rather than displaying nonsensical values.

WHAT IT CANNOT SEE

This tool cannot detect denial of service vulnerabilities that depend on off-chain conditions or social engineering. It cannot predict future gas cost changes due to hard forks or EIPs. It cannot guarantee that a contract is free from DoS vulnerabilities even if none are detected. It cannot detect DoS attacks that involve off-chain relayer or meta-transaction systems. The AI explanation is generated from on-chain data only and cannot detect off-chain conditions, hidden contract state, or social engineering factors. It cannot predict whether a DoS attack will be attempted or succeed. The tool does not continuously monitor DoS risks; each analysis is a snapshot at the time of the lookup. It cannot detect delayed DoS attacks, contract state changes, 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 security or protection against denial of service attacks.

PLEASE NOTE

Denial of Service 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. Denial of service vulnerabilities carry significant risk including contract lockup, transaction failures, and loss of 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.