Audit pricing confuses many teams because two quotes for the same repository can look nothing alike. This guide explains what actually drives the cost of a smart contract audit, how the common pricing models compare, and how to lower the bill without lowering the quality of the review.
Why There Is No Single Price for an Audit
An audit is mostly researcher time. The price reflects how many experienced researchers are needed, for how long, to review a specific codebase to a specific depth. Because codebases differ enormously in size, complexity, and novelty, so does the time they require.
That is also why a quote given before anyone has looked at the code is a warning sign. Without reading the repository, a provider can only guess at the effort, and the guess usually ends up in a narrower or shallower review than the team expected.
The Main Cost Drivers
Most audit quotes start from the amount of code and are then adjusted for how difficult that code is to reason about safely.
| Driver | Why it matters | Pushes cost up when |
|---|---|---|
| Code size (nSLOC) | Sets the baseline amount of code to read and test | Many contracts or large libraries are in scope |
| Complexity | Accounting, math, and state machines take longer to verify | Custom math, liquidations, multi-step flows |
| Novelty | New designs have no known-good reference to compare against | Novel mechanisms or unusual architecture |
| Language and stack | Fewer specialists for some languages and ecosystems | Rust, Move, ZK circuits, or custom VMs |
| Integrations | Every external protocol adds assumptions to check | Oracles, bridges, DEXs, lending markets |
| Timeline | Compressed schedules need more researchers in parallel | Short notice or a fixed launch date |
| Extras | Additional work beyond the core review | Formal verification, contests, re-audits |
Understanding nSLOC
nSLOC stands for normalized source lines of code. It counts the code in scope with comments, blank lines, and pure formatting removed, so the number reflects what researchers actually have to analyze rather than how the code is styled. Tools such as Solidity Code Metrics report it per file.
nSLOC is a starting point, not a formula. A thousand lines of straightforward token logic and a thousand lines of custom vault accounting with cross-chain messaging need very different amounts of time. Providers use nSLOC to size the work and complexity to adjust it.
Exclude tests, mocks, scripts, and unused code from the scope you send for quoting. They inflate nSLOC without adding to what will be deployed.
Common Pricing Models
Providers package security reviews in a few different ways. Each model buys a different kind of assurance.
| Model | How it is priced | What you get | Watch for |
|---|---|---|---|
| Private audit | Fixed quote derived from scope and researcher time | Assigned researchers, direct communication, report | What is included, especially fix verification |
| Researcher-time engagement | Rate per researcher per week or day | Flexible depth for evolving scope | Total cost if scope grows |
| Audit contest | Prize pool plus platform fees | Broad coverage from many researchers | Less collaboration and remediation support |
| Bug bounty | Rewards paid per valid finding in live code | Continuous coverage after launch | Reward size must match the value at risk |
| AI security scan | Priced per scan or codebase | Fast automated candidate findings | Results still need expert validation |
What a Good Quote Should Spell Out
A quote is easier to compare and less likely to surprise you if it states the following clearly.
- The exact repository, commit, and files in scope, with nSLOC.
- How many researchers will work on the code and for how long.
- Start date, review duration, and the window for remediation.
- Whether fix verification is included, and how many rounds.
- What the final report contains and whether it can be published.
- Payment terms and what happens if the scope changes.
How to Lower Cost Without Lowering Quality
The cheapest way to reduce an audit bill is to remove work that does not need an expert. Every hour researchers spend deciphering intent, working around missing tests, or reporting issues a static analyzer would have caught is an hour not spent on the logic that matters.
Think About Cost Relative to Value at Risk
An audit should be sized to what the protocol protects, not only to what the budget allows. A narrow, cheap review of a contract that will custody significant value is a false economy, while a small, well-tested contract with limited exposure may not need an extended engagement.
For larger systems, phasing the work often helps: audit the core first, then integrations and periphery, and plan additional reviews for upgrades. Our audit process guide explains how each stage fits together, and how to choose a smart contract auditor covers what to compare beyond price.
If you know a team planning an audit, the Kann Audits Referral Program pays referrers a share of the final audit deal value for qualified introductions.
Questions About Smart Contract Audit Pricing
Short answers to the questions teams ask when budgeting for a security review.
How much does a smart contract audit cost?
There is no fixed market price. Cost depends mainly on the size of the code in scope, measured in nSLOC, and on complexity, language, novelty, integrations, timeline, and the number and seniority of researchers. A credible provider reviews the codebase before giving a quote.
What is nSLOC and why does it affect audit pricing?
nSLOC means normalized source lines of code: the code in scope with comments, blank lines, and formatting removed. It is a common way to measure how much code researchers must review, so it drives the researcher time an audit needs. Complexity and novelty then adjust that estimate up or down.
Why do audit quotes for the same code differ so much?
Quotes differ when providers assign different numbers of researchers, different seniority, or different amounts of time, and when they define scope or included services such as fix verification differently. Compare what each quote covers and who will do the work before comparing totals.
How can I reduce the cost of a smart contract audit?
Reduce what researchers have to work around: freeze a stable commit, remove dead code, document intended behavior and roles, provide good tests, fix issues found by static analysis beforehand, and keep the scope to the code that will actually be deployed.
Is an audit contest cheaper than a private audit?
Not necessarily. Contests are priced through a prize pool and platform fees, and they offer broad coverage, but they give less direct collaboration and remediation support. Many teams pair a private audit with a contest or a bug bounty for high-value launches.
How does Kann Audits price an audit?
Pricing depends on the programming language, nSLOC, codebase complexity, and overall audit scope. Kann Audits provides a tailored quote after reviewing the codebase.
Primary references