AuditHex is a professional smart contract auditing service and affordable Solidity security review firm — screening contracts for critical vulnerabilities so investors, legal teams, VCs, and Web3 founders can make confident decisions before committing to a full blockchain security audit. We cover ERC20 token audits, ERC721 NFT audits, DeFi protocol security reviews, upgradeable proxy contract audits, and Foundry / Hardhat project security audits on Ethereum, BSC, Arbitrum, Polygon, Base, and Solana.
Our Solidity security audit and smart contract code review scans for the most critical vulnerability classes — reentrancy, access control flaws, integer overflows, and logic errors. We audit ERC20 tokens, ERC721 NFT contracts, upgradeable proxy contracts, DeFi protocols, and Foundry / Hardhat projects on Ethereum, BSC, Arbitrum, Polygon, Base, and Solana. Identify risks early before token launch or capital deployment.
Get a clear, actionable blockchain security audit report within one to two business days. Fast enough to support investment decisions, VC due diligence, legal reviews, and token launch timelines — without slowing down your deal flow.
Our DeFi smart contract audit reports and Web3 security audit PDFs are written for decision-makers, not just engineers. Each crypto audit report includes a plain-language explanation, CVSS severity rating, and a recommended fix — formatted for VC due diligence, legal review, and exchange listing security requirements.
Every smart contract security audit is reviewed by experienced blockchain security professionals. We combine automated detection with manual expert analysis to surface real risks, reduce false positives, and deliver findings you can trust — backed by verifiable methodology.
The most affordable smart contract audit screening on the market — from $300. Use it as a first-pass filter before committing to a full audit engagement. If the contract is clean, proceed with confidence. If it isn't, know exactly why — before it costs you 10–100x more with a top-tier blockchain audit company. An affordable Solidity security review that doesn't compromise on quality.
As part of our blockchain security audit process, we verify cryptographic signatures and on-chain identities embedded in your smart contract — confirming that transaction approvals and signed authorizations are genuine and tamper-proof. Essential for exchange listing security requirements and VC due diligence.
Experienced blockchain security researchers with backgrounds at leading Web3 security firms, DeFi protocols, and smart contract development teams.
9 years in blockchain security. Former senior auditor at a top-3 Web3 security firm. Specialises in DeFi protocol audits, reentrancy attack vectors, and flash loan exploit analysis. Has reviewed contracts securing over $800M in on-chain assets.
7 years in EVM security research and formal verification. Background in symbolic execution and fuzzing with Echidna and Medusa. Expert in upgradeable proxy contract audits, access control patterns, and cross-chain bridge security reviews.
6 years building and auditing Foundry and Hardhat project structures. Core contributor to open-source Solidity security tooling. Specialises in automated CVSS scoring pipelines, gas optimisation audits, and Foundry / Hardhat project security reviews for token launches.
Share your smart contract code, GitHub repository link, or on-chain deployment address. Tell us the blockchain network (Ethereum, BSC, Arbitrum, Polygon, Base, Solana), your project's use case, and any specific security concerns — our smart contract auditing team handles the rest.
We run industry-leading blockchain security tools (Slither, Mythril, Echidna) alongside expert manual smart contract review to detect vulnerabilities across all major risk categories — the same methodology used by top-tier smart contract security audit firms.
You receive a professional blockchain audit report with severity-rated findings, plain-language explanations, and a clear go / no-go recommendation — suitable for investor review, VC due diligence, legal counsel, or exchange listing security requirements.
If issues are found, we re-verify all fixes at no extra cost. Once your smart contract audit is clean, proceed to deployment, token launch, or a full-scope audit engagement — with documented evidence of professional pre-audit screening.
Smart contract audit cost at AuditHex:
Simple contract (up to 300 lines) — $300–$500 ·
Mid-size contract (300–1,000 lines) — $500–$1,500 ·
Large Foundry / Hardhat project (1,000+ lines) — $1,500–$3,000
All plans include a PDF security report with CVSS-scored findings delivered within 24–48 hours.
Everything you need to know before ordering a blockchain security audit report.
AuditHex pricing starts at $300 for contracts up to 300 lines. Mid-size contracts (300–1,000 lines) cost $500–$1,500. Large Foundry or Hardhat projects (1,000+ lines) are $1,500–$3,000. All plans include a professional PDF report with CVSS-scored findings and actionable fix recommendations.
Starter reports are delivered within 24 hours. Professional and Enterprise engagements within 24–48 hours. Rush delivery is available — contact us via email or Telegram.
Our audit detects reentrancy attacks, access control flaws, integer overflow/underflow, tx.origin authentication bugs, unprotected selfdestruct, flash loan vulnerabilities, weak PRNG randomness, unchecked external calls, delegatecall storage collisions, and 30+ additional vulnerability classes — each scored with a CVSS severity rating and mapped to SWC Registry IDs.
We audit smart contracts on Ethereum, BSC, Arbitrum, Polygon, Base, and Solana. We support Solidity, EVM-compatible contracts, and Foundry and Hardhat project structures. Submit a GitHub repo link, deployed contract address, or raw .sol file.
Yes. Every AuditHex PDF report includes an AI executive summary, plain-language risk explanations, CVSS severity scores, and a clear go/no-go deployment recommendation — formatted for VC due diligence, legal review, and exchange listing security requirements.
Yes. Professional and Enterprise plans include a free re-screen after the development team implements fixes — confirming all reported vulnerabilities are resolved before mainnet deployment.
A pre-audit screening (AuditHex) is an automated and expert-reviewed first-pass that finds critical vulnerabilities fast — for $300–$3,000. A full manual audit by firms like CertiK costs $15,000–$300,000+ and takes weeks. AuditHex is the smart first step: cheaper, faster, and tells you if a full audit is even needed.
A smart contract audit is a systematic security review of Solidity (or other blockchain) code to identify vulnerabilities, logic errors, and risks before deployment. Auditors check for issues like reentrancy, access control flaws, integer overflows, and flash loan attack vectors. The result is a structured security report with severity-rated findings and fix recommendations. AuditHex provides automated + expert-reviewed audits delivered as a PDF within 24–48 hours.
To audit your smart contract: 1) Submit your .sol file, GitHub repo link, or deployed contract address to AuditHex. 2) Specify the blockchain (Ethereum, BSC, Arbitrum, Polygon, Base, or Solana) and use case. 3) Receive your PDF security audit report with CVSS-scored findings within 24–48 hours. 4) Fix reported issues and request a free re-screen (Professional/Enterprise plans). No setup required — just send us the code.
Without a professional security audit, you cannot know for certain. Most DeFi exploits target contracts that were never audited — or audited only superficially. AuditHex scans for 30+ vulnerability classes including reentrancy, flash loans, access control flaws, and weak randomness. After a clean audit report, you can deploy with documented evidence of professional security screening. For contracts holding significant value, we recommend combining AuditHex screening with a full manual audit.
Yes. AuditHex audits ERC20 token contracts, ERC721 and ERC1155 NFT contracts, upgradeable proxy contracts (EIP-1967, UUPS, Transparent Proxy), DeFi AMM protocols, lending protocols, staking contracts, and Foundry / Hardhat full project structures. Submit any Solidity codebase — single file or multi-file project.
Yes. AuditHex supports Foundry project audits (foundry.toml auto-detected, forge build + forge test integration) and Hardhat project audits (hardhat.config.js/ts auto-detected, npx hardhat compile/test). Submit a GitHub repository link and we handle the rest — no manual configuration required.
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