How to Choose the Best Security API in 2026
There are 38 Security APIs in our directory. Of these, 8 require no authentication, making them ideal for quick prototyping. 8 are rated beginner-friendly.
Scores last tested: 2026-08-10
Quick Comparison: Top 10 Security APIs
Ranked by API Score. Measured means we called a real endpoint of that API; Est. means the score is derived from metadata because the endpoint could not be called without credentials. Discontinued APIs are excluded.
| Name | API Score | Auth | HTTPS | CORS | Difficulty |
|---|---|---|---|---|---|
| EmailRep | 95 A+ Est. | No Auth | ✓ | ? | Beginner |
| Passwordinator | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| FilterLists | 87 A Est. | No Auth | ✓ | ? | Beginner |
| FingerprintJS Pro | 87 A Est. | API Key | ✓ | ✓ | Intermediate |
| HaveIBeenPwned | 87 A Measured | API Key | ✓ | ? | Intermediate |
| BinaryEdge | 82 A Est. | API Key | ✓ | ✓ | Intermediate |
| Botd | 82 A Est. | API Key | ✓ | ✓ | Intermediate |
| Complete Criminal Checks | 82 A Est. | API Key | ✓ | ✓ | Intermediate |
| LoginRadius | 82 A Est. | API Key | ✓ | ✓ | Intermediate |
| Microsoft Security Response Center (MSRC) | 82 A Est. | No Auth | ✓ | ? | Beginner |
Free Security APIs (No Auth)
These APIs require no API key or signup. Start using them immediately.
EmailRep
⭐ Beginner's PickEmailRep is a free API that evaluates the risk and reputation of an email address in seconds.
FilterLists
⭐ Beginner's PickFilterLists is a community-maintained directory API that catalogs hundreds of filter lists used by ad blockers and firewalls like uBlock Origin and Pi-hole.
Microsoft Security Response Center (MSRC)
⭐ Beginner's PickThe Microsoft Security Response Center (MSRC) API provides programmatic access to Microsoft's security update data, including CVEs, advisories, and patch information.
Mozilla http scanner
⭐ Beginner's PickMozilla's HTTP Observatory API scans websites and grades their HTTP security configuration, checking for headers like CSP, HSTS, X-Frame-Options, and more.
National Vulnerability Database
⭐ Beginner's PickThe National Vulnerability Database (NVD) API gives you access to the U.S.
Passwordinator
⭐ Beginner's PickThe Passwordinator API generates random passwords with customizable complexity, length, and character sets.
Try It in 5 Minutes: National Vulnerability Database
Quick implementation example using National Vulnerability Database.
Using curl
curl "https://services.nvd.nist.gov/rest/json/cves/2.0?keywordSearch=apache&resultsPerPage=5"
JavaScript
const url = "https://services.nvd.nist.gov/rest/json/cves/2.0?keywordSearch=apache&resultsPerPage=5";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); New to APIs? Read our Getting Started Guide →
Frequently Asked Questions
How many Security APIs are available?
There are 38 Security APIs in our directory as of 2026.
Are there free Security APIs?
Yes, 8 Security APIs require no authentication and are completely free to use.
What is the easiest Security API to use?
National Vulnerability Database is one of the easiest to get started with. It is rated as beginner-level and requires no authentication.
Do I need an API key for Security APIs?
It depends. 8 APIs need no authentication, 23 require an API key, and 1 use OAuth.