Top 40 Security APIs For Developers - Public APIs

Security-first search engine API for AI agent skills with Trust Score.

Cryptographic proof API for HTTP exchanges — Ed25519, RFC 3161, and Sigstore Rekor attestation.

Scan files for viruses, worms, trojans, ransomware, and other kinds of malware by sending them to the attachmentAV API powered by Sophos.

Scan files for secrets (API Keys, database credentials).

Lists of filters for adblockers and firewalls.

Find leaked or exposed credentials by email, username, phone, domain, hash, or breach origin.

Domain and IP related information such as current and historical WHOIS and DNS records.

Domain and DNS related information that will equip organizaion with comprehensive threat intelligence and attack surface analysis capabilities for enhanced security.

Automated security testing API for web apps.

Encrypting & decrypting text messages.

VulDB API allows to initiate queries for one or more items along with transactional bots.

UK Police data.

Access data on all Internet assets and build powerful attack surface management applications.

Search engine for Internet connected devices.

Scan, search and collect threat intelligence data in real-time.

Generate merchant-specific and one-time use credit card numbers that link back to your bank.

Phishing database.

Generate random passwords of varying complexities.

U.S. National Vulnerability Database.

Mozilla observatory tls scanner.

Mozilla observatory http scanner.

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

Managed User Authentication Service.

Perform OSINT via Intelligence X.

Passwords which have previously been exposed in data breaches.

The industry’s first hacker API that helps increase productivity towards creative bug bounty hunting.

Query IPs in the GreyNoise dataset and retrieve a subset of the full IP context data.

Searchable attack surface database of the entire internet.

Screen order information using AI to detect frauds.