DefenceLevel Index API alternatives

Daily cyber threat level (DEFCON 5 to 1) with open method, history in JSON/CSV and a badge. If it doesn't fit your project, here are the 10 best free Security APIs to use instead in 2026, out of 65 in the directory.

For reference, DefenceLevel Index API: No API key needed · 100% uptime (30 days) · Callable from the browser (CORS).

1. 1

   IPLogs API

   Online · 1003 ms

   Free VPN, proxy, Tor and datacenter IP detection. 13 sources, active probing.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
2. 2

   OSV API

   Online · 455 ms

   Open source vulnerability database and distributed triage infrastructure.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
3. 3

   Passwordinator API

   Online · 406 ms

   Generate random passwords of varying complexities.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
4. 4

   Presend API

   Online · 529 ms

   Security and developer utility API -- malware, vulnerability, and domain checks, no signup.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
5. 5

   IPGuardian API

   Online · 1734 ms

   Check IP addresses against 140+ public threat intelligence blocklists.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
6. 6

   SSL Labs API

   Online · 310 ms

   Deep SSL/TLS server analysis with A+ to F grading.

   • No API key needed
   • 100% uptime (30 days)
   • Fast: 310 ms response
   • HTTPS

   No authHTTPSCORS ?
7. 7

   VPNDetection API

   Online · 1217 ms

   Check whether an IPv4 or IPv6 address belongs to VPN infrastructure, no key needed.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
8. 8D

   dead-drop API

   Online · 1384 ms

   Ephemeral zero-knowledge encrypted data sharing.

   • No API key needed
   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
9. 9

   CSR.plus API

   Online · 1773 ms

   Generate certificate signing requests and private keys without OpenSSL.

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
10. 10

    Microsoft Security Response Center (MSRC) API

    Online · 907 ms

    Programmatic interfaces to engage with the Microsoft Security Response Center (MSRC).

    • No API key needed
    • 100% uptime (30 days)
    • HTTPS

    No authHTTPSCORS ?

DefenceLevel Index API vs alternatives

DefenceLevel Index API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
DefenceLevel Index	No	Yes	Yes	100%	1080 ms	Not rated
IPLogs	No	Yes	Yes	100%	1003 ms	Not rated
OSV	No	Yes	Yes	100%	455 ms	Not rated
Passwordinator	No	Yes	Yes	100%	406 ms	Not rated
Presend	No	Yes	Yes	100%	529 ms	Not rated
IPGuardian	No	Yes	Yes	100%	1734 ms	Not rated
SSL Labs	No	Yes	Unknown	100%	310 ms	Not rated
VPNDetection	No	Yes	Yes	100%	1217 ms	Not rated
Ddead-drop	No	Yes	Yes	100%	1384 ms	Not rated

See also: best Security APIs · all Security APIs