Smart Contract Audit Cost in 2026: Budget & Scope Guide

Trail of Bits ($150K+):  ★★★★★ Quality, ★★☆☆☆ Cost
OpenZeppelin ($100K+):   ★★★★★ Quality, ★★★☆☆ Cost
Code4rena ($30K):        ★★★★☆ Quality, ★★★★★ Cost
Sherlock ($30K):         ★★★★☆ Quality, ★★★★★ Cost
Hats Finance ($15K):     ★★★☆☆ Quality, ★★★★★ Cost

Rule of thumb:
- Top tier = most comprehensive but expensive
- Competitive audits = best value for money
- Protocol TVL > $10M? Use Tier 1
- Protocol TVL $1-10M? Tier 2 + competitive audit
- Protocol TVL < $1M? Competitive audit + bug bounty

☐ Off-chain components (backend, frontend)
☐ Operational security (key management, deployment process)
☐ Governance attacks (proposal manipulation)
☐ Economic attacks (long-term incentive analysis)
☐ Third-party dependency audits (Oracle, bridge)
☐ Zero-day vulnerabilities in Solidity/EVM itself

Final audit report includes:
1. Executive summary (risk level, finding count)
2. Finding table (categorized by severity)
3. Detailed finding descriptions:
   - Vulnerability description
   - Impact assessment
   - Likelihood assessment
   - Proof of concept (PoC) code
   - Remediation recommendation
4. Fix review (if applicable)
5. Auditor qualifications
6. Code coverage overview

Phase 1: Code Quality (2 weeks before audit)
□ Run Slither: no high findings
□ Run Aderyn: all findings addressed
□ Static analysis passes

Phase 2: Testing (1 week before audit)
□ Unit test coverage: 100% of functions
□ Branch coverage: 90%+
□ Fuzz tests: 10+ invariants tested
□ Integration tests: main deploy scenarios
□ Fork tests: mainnet simulation

Phase 3: Documentation (before sending to auditor)
□ NatSpec on every function and modifier
□ Architecture diagram (LucidChart, Excalidraw)
□ Deployment and upgrade documentation
□ Known risks / architectural decisions doc
□ Test coverage report

Without preparation:
  Audit cost: $50K
  Findings: 25 (10 medium+, 15 low/info)
  Fix + re-audit: $10K
  Total: $60K
  Timeline: 5 weeks

With preparation:
  Audit cost: $40K (20% less — auditor spends less time)
  Findings: 8 (3 medium+, 5 low/info)
  Fix + re-audit: $5K
  Total: $45K
  Timeline: 3 weeks

Savings: $15K (25% reduction) + faster timeline

□ How many auditors will be assigned to my project?
□ What are their qualifications/experience?
□ What automated tools do you use?
□ Do you provide PoCs for findings?
□ What's the fix review process?
□ Can you sign an NDA?
□ What's the estimated timeline?
□ What's your fee structure? (fixed vs hourly)
□ Can you share examples of similar audits?
□ What happens if critical bugs are found after the audit?

□ You're launching a DeFi protocol with >$1M TVL expected
□ You're integrating with major protocols (Lido, Uniswap, Aave)
□ You're raising funds from VCs or institutional investors
□ You're deploying to Ethereum mainnet (not testnet)
□ Your protocol handles user funds directly (non-custodial but executes on their behalf)
□ Insurance providers require it for coverage
□ You want to be listed on major dApp directories or aggregators