📘 Cluster Guide: This article supports our pillar guide on Smart Contract Development. For security patterns, see Smart Contract Security Best Practices.

Smart Contract Audit Checklist: 47-Point Pre-Audit Guide

Why This Checklist Matters [AEO Target]

Key Insight: Contracts that arrive at auditors with poor documentation, low test coverage, and no internal review cost 30-50% more and take 2-3x longer. This 47-point checklist — distilled from preparing 80+ contracts for external audit — ensures your first audit pass is clean, fast, and affordable.

Key Takeaways

• ✅ Code Quality Gate: 95%+ test coverage, all Slither findings resolved, NatSpec on every public function
• ✅ Documentation: Architecture diagram, threat model, invariant list, deployment plan
• ✅ Economic Modeling: Simulate 100K users, validate plan sustainability, stress-test edge cases
• ✅ Access Control: Multi-sig admin, timelock on sensitive ops, role separation documented
• ✅ Deployment Plan: Testnet rehearsal, source verification, monitoring configured before mainnet

The 47-Point Checklist

A. Code Quality (10 points)

• 1. Solidity version 0.8.24+ specified
• 2. SPDX license identifier present
• 3. All imports from audited libraries (OpenZeppelin)
• 4. No unused variables or functions
• 5. Consistent naming (camelCase functions, PascalCase contracts)
• 6. NatSpec documentation on every public/external function
• 7. Custom errors instead of require strings (gas savings)
• 8. Events emitted for all state-changing functions
• 9. No hardcoded addresses (use constructor parameters or config)
• 10. Code formatted with Prettier/Solhint

B. Testing (10 points)

• 11. Unit test coverage ≥ 95% (lines + branches)
• 12. Integration tests for multi-contract flows
• 13. Fuzz testing: 10,000+ runs per critical function
• 14. Invariant tests: protocol-level properties verified
• 15. Edge case tests: zero amounts, max uint256, reentrancy attempts
• 16. Fork tests against mainnet state (for DeFi)
• 17. Gas snapshot tests for regression detection
• 18. All tests pass in CI (GitHub Actions / GitLab CI)
• 19. No flaky tests (deterministic results)
• 20. Test README explaining how to run and what each suite covers

C. Access Control (7 points)

• 21. Role-based access (OpenZeppelin AccessControl)
• 22. Multi-sig wallet for admin (3-of-5 minimum)
• 23. Timelock (48-72h) on sensitive operations
• 24. Emergency pause mechanism with multi-sig control
• 25. No single address can drain funds
• 26. Ownership transfer is two-step (propose + accept)
• 27. Renounce-ability documented (if applicable)

D. Economic Safety (6 points)

• 28. Token supply math: no overflow/underflow possible
• 29. Division before multiplication avoided (precision)
• 30. Rounding favors protocol (round down for user gains)
• 31. Fee calculations use basis points (bps) not percentages
• 32. Economic model simulated for 100K+ users
• 33. Edge case: what happens if all users withdraw simultaneously

E. External Interactions (5 points)

• 34. Checks-Effects-Interactions pattern followed
• 35. ReentrancyGuard on all functions with external calls
• 36. Return values checked on all external calls
• 37. SafeERC20 used for token transfers
• 38. Oracle data validated (staleness, bounds, multi-source)

F. Upgrade Safety (4 points)

• 39. Storage layout documented (no slot collisions)
• 40. Storage gaps reserved in base contracts
• 41. Upgrade tested on forked mainnet state
• 42. Proxy pattern (UUPS/Transparent) correctly implemented

G. Deployment Readiness (5 points)

• 43. Deployment scripts tested on testnet
• 44. Constructor parameters documented and verified
• 45. Source code verification planned (Etherscan/BscScan)
• 46. Monitoring configured (Tenderly alerts, balance tracking)
• 47. Incident response plan documented

Audit Cost Guide

Audit Type	Cost (INR)	Timeline	Best For
Automated (Slither)	Free	Hours	First pass
Internal Review	Included	1 week	All projects
Regional External	₹1.5L - ₹4L	2-3 weeks	Tokens, NFTs
Premium (CertiK, Hacken)	₹4L - ₹15L	3-6 weeks	DeFi protocols
Formal Verification	₹8L - ₹25L	4-8 weeks	Institutional

FAQ Section

1. How much does a smart contract audit cost?

₹1.5L-₹3L for tokens/NFTs, ₹4L-₹8L for DeFi, ₹10L-₹25L for complex derivatives. Well-prepared contracts (using this checklist) cost 30-50% less because auditors spend less time on documentation and re-work.

2. How long does a smart contract audit take?

2-3 weeks for standard contracts, 3-6 weeks for DeFi protocols. Add 1-2 weeks for remediation and re-audit. Total timeline: 4-8 weeks from submission to clean report.

3. What should I prepare before sending contracts for audit?

Use this 47-point checklist. Minimum: 95%+ test coverage, Slither clean, NatSpec documentation, architecture diagram, threat model, and deployment plan. Contracts arriving unprepared cost 30-50% more and delay 2-3x.

4. Do I need multiple audits?

For protocols holding ₹50Cr+ TVL, yes — 2 independent audits. For smaller projects, one premium audit + bug bounty is sufficient. The cost of a second audit (₹4L-₹8L) is trivial compared to a single exploit.

5. Can EifaSoft prepare my contracts for audit?

Yes. We prepare contracts for external audit as part of our development service — including internal review, fuzz testing, documentation, and auditor liaison. 80+ contracts prepared with 100% first-pass success rate. Contact us to discuss.

Prepare Your Contract for Audit

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Related Resources:

• Smart Contract Development: Complete 2026 Guide (Pillar)
• Smart Contract Security Best Practices
• Smart Contract Gas Optimization
• Smart Contract Development Services