Best API Security Tools in 2026
One of these bills per million requests. Two are free scanners you run yourself. A $499 desktop license is not a WAF.
AWS WAF is the metered edge: $5 per web ACL, $1 per rule, $0.60 per million requests. OWASP ZAP and ModSecurity are free. Burp Suite Professional is $499 for a tester license, not a production gateway. Cloudflare's public plans page did not expose WAF dollars on 26 August 2026; confirm on cloudflare.com before you treat a blog number as a quote.
Key facts5 tools compared: AWS WAF, OWASP ZAP, Burp Suite Professional, ModSecurity, Cloudflare
- 5 tools compared: AWS WAF, OWASP ZAP, Burp Suite Professional, ModSecurity, Cloudflare
- OWASP ZAP (best for: Continuous integration and staging scans when you want a report, not a production block): Free, open source; you pay for the machine that runs the scan.
- Burp Suite Professional (best for: A human tester who needs to intercept and rewrite a live API session): From $499 per license; Community Edition is free; Enterprise is sales-quoted.
- ModSecurity (best for: Teams that want a WAF they operate, without a per-request vendor meter): Free, open source; you pay for the reverse proxy, usually nginx or Apache.
API security tools get sold as one category. They bill as three. A WAF meters requests at the edge. A scanner finds issues in a lab. A desktop proxy is a person sitting in the middle of a session.
Lining those up on a feature grid is how a team buys a $499 license and still has no production control.
The useful comparison is what each product can actually drop or block, and what unit that costs, because a free scanner that never sits in the request path is not a cheaper WAF.
Top Picks
Based on features, real-world fit, and value for money.
From $5/month per web ACL, plus $1/month per rule and $0.60 per million requests.
APIs already on AWS that need a production allow/block decision at the edge
Free, open source; you pay for the machine that runs the scan.
Continuous integration and staging scans when you want a report, not a production block
The $499 desktop proxy. The right tool for a pentest, the wrong one for an edge.
From $499 per license; Community Edition is free; Enterprise is sales-quoted.
A human tester who needs to intercept and rewrite a live API session
| Tool | Pricing | Best for |
|---|---|---|
| AWS WAF | From $5/month per web ACL, plus $1/month per rule and $0.60 per million requests. | APIs already on AWS that need a production allow/block decision at the edge |
| OWASP ZAP | Free, open source; you pay for the machine that runs the scan. | Continuous integration and staging scans when you want a report, not a production block |
| Burp Suite Professional | From $499 per license; Community Edition is free; Enterprise is sales-quoted. | A human tester who needs to intercept and rewrite a live API session |
| ModSecurity | Free, open source; you pay for the reverse proxy, usually nginx or Apache. | Teams that want a WAF they operate, without a per-request vendor meter |
| Cloudflare | Sold on plans and add-ons; confirm WAF and API Shield pricing on cloudflare.com. | Sites already on Cloudflare that want the WAF in the same edge as DNS and CDN |
Pricing read from each vendor's own pricing page, checked Aug 2026. 1 of 5 has no standalone price (bundled, usage-based or free to self-host) and is described as charged, not guessed. 2 of 5 publish prices for some plans and quote the rest.
- Pricing
- From $5/month per web ACL, plus $1/month per rule and $0.60 per million requests.
Best for: APIs already on AWS that need a production allow/block decision at the edge
Pros
- Published request math, so you can estimate before the first invoice
- Sits in the live path, which a scanner never does
- Managed rule groups exist if you do not want to write every condition
Cons
- Bot Control and CAPTCHA are separate meters on top of the $0.60
- A messy ACL with unused rules still bills $1 each
OWASP ZAP
The free API and web scanner. It finds issues. It does not sit on the edge.
- Pricing
- Free, open source; you pay for the machine that runs the scan.
Best for: Continuous integration and staging scans when you want a report, not a production block
Pros
- Genuinely free, with a daemon mode that fits CI
- Active and passive scans cover the usual OWASP API list
- No request meter, so a noisy staging environment does not create a bill
Cons
- A finding is not a block. Someone still has to fix or put a WAF in front
- Authenticated API scans take setup, and a default crawl will miss most of the surface
Burp Suite Professional
The $499 desktop proxy. The right tool for a pentest, the wrong one for an edge.
- Pricing
- From $499 per license; Community Edition is free; Enterprise is sales-quoted.
Best for: A human tester who needs to intercept and rewrite a live API session
Pros
- Still the default toolkit for people who actually test APIs by hand
- The scanner plus Intruder cover cases ZAP users often do in two tools
- Community Edition is free if you only need a proxy
Cons
- $499 buys a person a license, not production protection
- It does not meter or block production traffic
ModSecurity
The free rules engine. No invoice, and you own the false positives.
- Pricing
- Free, open source; you pay for the reverse proxy, usually nginx or Apache.
Best for: Teams that want a WAF they operate, without a per-request vendor meter
Pros
- No per-million request fee
- OWASP CRS is a known starting ruleset
- Runs where you already terminate TLS
Cons
- You are the vendor: updates, tuning and outages are yours
- A default CRS on an API will block real clients until you tune it
Cloudflare
The other common edge. Confirm the WAF line on their site; we would not invent the plan price.
- Pricing
- Sold on plans and add-ons; confirm WAF and API Shield pricing on cloudflare.com.
Best for: Sites already on Cloudflare that want the WAF in the same edge as DNS and CDN
Pros
- If the site is already on Cloudflare, the WAF is one toggle away from the same edge
- API Shield and Bot Fight sit next to the WAF rather than in another vendor
- A free zone exists for a first look
Cons
- We could not lock a live WAF dollar amount on 26 August 2026
- Bot and API add-ons are easy to underestimate if you only read the CDN plan
What it is
An API security tool inspects HTTP APIs for injection, broken auth, excessive data and abuse. The job splits. Edge WAFs sit in front of production and decide allow or block. Scanners crawl or fuzz a staging URL and write a report.
Proxy toolkits let a tester intercept and rewrite a single session. A few vendors now sell API discovery and runtime sensors as a fourth product. Those are almost always sales-quoted.
Why it matters
The bill, when there is one, is usually requests plus rules, not seats. AWS WAF's own example for 10 million requests and 19 rules lands near $30 a month. That is a different product from a $499 Burp license you renew once a year.
Mixing them up is how security budget gets spent on a tool that never sees production traffic.
Key features to look for
Pricing
Prices were checked on 26 August 2026. AWS WAF and Burp Suite Professional publish prices. Burp Enterprise is sales-quoted, and Cloudflare had no WAF dollar amount on its public plans page, so a Pro $20 figure is not a quote. OWASP ZAP and ModSecurity are free and open source: you pay for the machine or the reverse proxy.
The cheapest published paid entry is an AWS web ACL at $5 a month, plus $1 a month per rule and $0.60 per million requests. AWS's own example of 10 million requests and 19 rules is about $30 a month, Bot Control and fraud modules are extra, and the $499 Burp license is a desktop tester seat.
| Plan | Price | Best for |
|---|---|---|
| AWS WAF Web ACL | $5/month | Monthly charge per web ACL |
| AWS WAF Rule | $1/month | Monthly charge per rule |
| AWS WAF Requests | $0.60 per million requests | Per million requests |
| AWS WAF example | About $30/month | 10 million requests and 19 rules |
| AWS WAF add-ons | Extra | Bot Control and fraud modules are extra |
| OWASP ZAP | Free | You pay for the machine that runs the scan |
| Burp Suite Professional | $499 per license | Buy Now on the product page, 26 August 2026 |
| Burp Suite Community | Free | Community Edition is free |
| Burp Suite Enterprise | Custom quote | Separate scanner product, sales-quoted |
| ModSecurity | Free | You pay for the reverse proxy, usually nginx or Apache |
| Cloudflare WAF | Confirm on cloudflare.com | Sold on plans and add-ons; confirm API Shield |
The bottom line
Put AWS WAF in front of an AWS API when you need a published request price and a live block. Use OWASP ZAP in CI and Burp Suite Professional when a person is testing. Run ModSecurity if you want the edge without a vendor meter and you will staff the tuning.
Confirm Cloudflare WAF dollars on their site before you budget a blog number.
Frequently asked questions
What is the best free API security tool?
How much does AWS WAF cost?
How much does Burp Suite Professional cost?
Is a WAF enough for API security?
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