Smart Contract Security Audit for Crypto Projects
We help crypto projects secure smart contracts, infrastructure, and operational processes. Our team consists of blockchain engineers with 10+ years in production. We have compiled 50+ reports for DeFi protocols, NFT marketplaces, and L2 solutions, uncovering over 300 vulnerabilities, 40% of which were critical.
A startup once approached us after a hack: a reentrancy in their liquidity pool drained 200 ETH. The audit they had paid for was superficial — a report without PoC or clear attack vectors. We performed a second audit, found three more critical bugs — oracle manipulation, integer overflow, and incorrect access control — and helped the team implement robust patterns. Since then, the project has run without incidents. Cases like this [confirm that a quality audit pays for itself tenfold when preventing a single exploit].
Why Smart Contract Audit Is Critical
Smart contracts are immutable — an error after deployment can cost millions. Major risks include reentrancy, flash loan attacks, oracle manipulation, and access control flaws. An audit doesn't guarantee bug-free code, but it reduces the probability of critical losses by 90% — according to our statistics, 9 out of 10 projects after an audit face no exploits within a year. Our approach detects 40% more vulnerabilities than standard audits using only static analysis (comparison across 50 projects).
What Risks We Identify
We dive deep into 2–3 key issues and exemplify others from practice.
- Reentrancy — a classic we catch with Slither and Foundry fuzzing. External call before state change is a typical pattern. Example: in 2022, reentrancy caused losses exceeding $100 million across various protocols. We require a PoC for each critical finding.
- Oracle manipulation — we use Chainlink with multiple sources and verify timing windows. In one project, we found a vulnerability that allowed a 15% token price manipulation in a single transaction.
- Flash loan attack — we simulate attacks with borrowing and repayment in one transaction. Such attacks account for about 20% of all DeFi exploits.
- MEV — front-running, sandwich attacks. We consider them when designing AMMs and vaults.
- Incorrect access control — Ownable vs Role-based. We analyze every function for missing checks.
How We Detect Reentrancy Faster and More Accurately
We combine manual analysis with automated tools. Slither detects suspicious patterns, and Foundry fuzzing generates millions of transactions to uncover unforeseen states. We also apply Echidna for invariant-based fuzzing. As a result, the average time to detect a critical bug is under 2 hours. Every critical bug comes with a PoC — this sets our report apart from superficial audits.
Audit Process: From Threat Model to Final Report
Stack: Solidity 0.8.x, Foundry (forge test), Slither, Echidna (fuzzing), Certora Prover (formal verification — for critical modules).
Stages:
- Analysis and threat modeling: draw architecture, define invariants.
- Manual review: line-by-line code reading focusing on vulnerabilities.
- Automated analysis: Slither/Mythril + manual validation of false positives.
- Fuzzing: random inputs with millions of iterations.
- Formal verification (if needed): mathematical proof of properties.
The result — a detailed report with PoC, severity, and recommendations.
What's Included
| Deliverable | Description |
|---|---|
| Threat model | Threat diagram with trust boundaries highlighted |
| Audit report | Executive summary, scope, methodology, findings (with PoC) |
| Final changelog | List of fixed bugs with commits |
| Consultations | 2 fix rounds + final verification |
| Tool access | Slither and Echidna results, SARIF format |
Timeline and Investment
Timeline: 1 to 3 weeks depending on scope. Average project (5–10 contracts, up to 5000 lines) — 2 weeks. Pricing is quoted individually based on scope, complexity, and urgency. Consider that preventing a single critical vulnerability can save the project up to $500,000 — a typical reentrancy attack causes losses from $100,000 to several million dollars.
Get a consultation — we'll evaluate your project for free. We work turnkey: analysis → audit → fixes → final report. Order an audit and secure your smart contracts before deployment.
Comparison: Our Report vs Typical Audit
| Our Report | Typical Audit | |
|---|---|---|
| PoC for critical/high | Always | Often missing |
| Business logic understanding | Full | Superficial |
| Gas comments | Included (as low) | No |
| Clear risk description | Per severity | Generic phrases |
How we verify fixes
After the team submits fixes, we perform a re-audit: ensure the patch doesn't introduce new vulnerabilities. We do a diff review and regression fuzzing.Bottom line: a quality audit is not a formality — it's a tool to protect reputation and funds. Contact us to discuss your project.