LoginRadius
Managed User Authentication Service
Security · API key · HTTPS
Security APIs · Page 2
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Ordered by reported HTTPS, CORS support, no-auth access, then changed/observed facts. Access signals are not a popularity or quality score.
Tanod
Pay-per-call scans of smart contracts, addresses and MCP/skill packages; small free daily tier
Security · No auth · HTTPS
Agent Verifier
Self-check for AI agents: verifies Web Bot Auth signatures and shows how a request looks
Security · No auth · HTTPS
Blooms
Distribute keys once for serverless applications
Security · No auth · HTTPS
FishFish
A volunteer cybersecurity project focused on providing resources and services that improve safety across Discord
Security · No auth · HTTPS
Dehash.lt
Hash decryption MD5, SHA1, SHA3, SHA256, SHA384, SHA512
Security · No auth · HTTPS
EmailRep
Email address threat and risk prediction
Security · No auth · HTTPS
Escape
An API for escaping different kind of queries
Security · No auth · HTTPS
FilterLists
Lists of filters for adblockers and firewalls
Security · No auth · HTTPS
Microsoft Security Response Center (MSRC)
Programmatic interfaces to engage with the Microsoft Security Response Center (MSRC)
Security · No auth · HTTPS
Mozilla http scanner
Mozilla observatory http scanner
Security · No auth · HTTPS
Mozilla tls scanner
Mozilla observatory tls scanner
Security · No auth · HTTPS
National Vulnerability Database
U.S. National Vulnerability Database
Security · No auth · HTTPS
PhishStats
Phishing database
Security · No auth · HTTPS
SSL Labs
Deep SSL/TLS server analysis with A+ to F grading
Security · No auth · HTTPS
UK Police
UK Police data
Security · No auth · HTTPS
URLhaus
Database of malicious URLs used for malware distribution
Security · No auth · HTTPS
RealBots
Verify whether requests claiming to be GPTBot, ClaudeBot & other AI crawlers are real
Security · API key · HTTPS
CISA Known Exploited Vulnerabilities
CISA KEV catalog of actively exploited CVEs as JSON, filterable by vendor, with CWE and due dates
Security · API key · HTTPS
isMalicious
Reputation of IPs, domains, URLs and file hashes from aggregated threat feeds, plus CVE lookups
Security · API key · HTTPS
GreyNoise
Query IPs in the GreyNoise dataset and retrieve a subset of the full IP context data
Security · API key · HTTPS
Whoisfreaks
Domain and DNS related information that will equip organizaion with comprehensive threat intelligence and attack surface analysis capabilities for enhanced security
Security · API key · HTTPS
WhoisJSONApi
Domain WHOIS information to detect and prevent online threats, enhancing overall online safety for individuals and organizations
Security · API key · HTTPS
ThreatCluster
Threat intelligence: incident clusters, validated IOCs, CVEs, ransomware leak-site victims
Security · API key · HTTPS