The cybersecurity API directory

Multi-account and fraud detection. Sending emails without ending up in SPAM

Validate email addresses for deliverability and spam

Fraud detection API offering highly accurate browser fingerprinting

Screen order information using AI to detect frauds

Check links to see if they're known phishing attempts

Multiple spam filtering service

Phishing database

Free service to classify text for spam using ML

CNAM caller ID, carrier/LRN lookup and spam scoring for North American phone numbers

Easy to implement, adaptable authentication and authorization platform

API calculates and validates the carbon footprint

Calculate the environmental footprint created by a broad range of emission-generating activities

Implement OTP flow quickly

Provides identity verification, KYC (Know Your Customer), and AML (Anti-Money Laundering) solutions, including document verification and biometric authentication

Managed User Authentication Service

User management and authentication

Secure and modern passwordless authentication platform

Simplify login and improve user experience by integrating passwordless authentication in your app

Free multi-protocol sandbox: REST, GraphQL & SOAP with OAuth2/JWT auth and OpenAPI 3.0 spec

API to estimate the carbon footprint of loading web pages

Detect leaked secrets and prompt-injection in text and return redacted output

IP geolocation, ISP and privacy/VPN scoring, email breach checks, DNS and WHOIS lookups

Passwords which have previously been exposed in data breaches

Vessel sanctions screening, ownership transparency scoring, and vetting intelligence

EU legal research over the EUR-Lex corpus (DE/EN/FR) with verifiable CELEX citations; semantic search, knowledge reports, legal timelines for GDPR, AI Act, NIS2, DORA

Chinese content compliance review (17 platforms), EN↔CN translation, and SEO optimization. Pay-per-call via x402 (Solana USDC).

Data on international sanctions, crime and politically exposed persons

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

Free utility API platform. QR codes, screenshots, PDFs, image resize, hashing, and more

Best open-source password manager

Encrypting & decrypting text messages

Hash decryption MD5, SHA1, SHA3, SHA256, SHA384, SHA512

Scan files for secrets (API Keys, database credentials)

A REST API to access high level cryptographic functions and methods

Generate random passwords of varying complexities

Used For Learning purpose Learn all security types with this api

203 JSON endpoints: hashing, encoding, unit conversion, text, dates and file conversion

Ephemeral zero-knowledge encrypted data sharing

Check a domain's SPF, DKIM, DMARC and MX with a graded shareable report

API hub with DNS, WHOIS, Screenshot, IP Geolocation, Weather, Commodity & Currency APIs

Korean crypto channel stance + RAG Q&A + canonical entity/topic/event store

Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec

Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More

Validate email addresses, phone numbers, VAT numbers and domain names

Search among openly licensed and public domain works

DNS, WHOIS/RDAP, SSL, subdomain enumeration, and email security in one parallel call

Domain name search to find all domains containing particular words/phrases/etc

Registered Domain Names Search

A hassle free API for managing web fonts provided by Google Fonts

Google Link/Domain Flagging

Google Link/Domain Flagging

Domains Data API for Developers

WHOIS domain name and hosted domain lookup

WHOIS domain name lookup

Geolocation API,ASN API,IP Ranges API,IP Firewall API,Domain API

Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript

TLS certificate analysis with protocol matrix, cipher suite and HSTS grading

Free mock REST APIs across different business domains

Mozilla observatory tls scanner

Network calculators, including subnets, DNS, binary, and security tools

URL redirect management with custom domains, HTTPS, analytics, and REST API

SSL certificate validity, domain WHOIS status, and DNS record checks for any domain

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

Short URLs support so many domains

URl Shortener with multiple Domains

Project Sonar DNS Enumeration API

University names, countries and domains

Domain availability across 1200+ TLDs with registration and renewal prices

Basic DNS query via HTTP GET request

Find location with IP address or domain

Geographic location of an IP address or any domain name along with some other useful information

Suite of APIs including email validation, IP geolocation, phone validation, exchange rates and more

API for domain search, professional email finder, author finder and email verifier

Email verification API

Free email validation: MX check, disposable detection, syntax

Email address validation with MX, disposable, role and typo detection

Disposable Email

SEO monitoring, email verification, lead generation, and marketing analytics

GTM enrichment, lead generation, email verification, and company signals

Syntax + MX + disposable/role-based email validation

Email Finder for B2B sales and email marketing and email verifier

IP Geolocation API. Collecting data from multiple sources

IP Geolocation API. Collecting data from multiple sources

Bundled API for countries, states, cities, IP geolocation, and live exchange rates

Provides fast and accurate IP geolocation APIs along with security checks and confidence area

Free geo ip information, no registration required. 15k/hour rate limit

IP geolocation with ChatOps integration

Free IP Geolocation API: 2000 daily lookups, multiple servers worldwide

Geolocate website visitors from their IPs

Free IP Geolocation API

IP geolocation web service to get more than 55 parameters

Free IP geolocation API to geolocate user's location information

IP geolocation and currency conversion

IP Geolocation AP with free plan 30k requests per month

Find geolocation of any IP address with IP Geolocation API

Get the IP geolocation data through the simple REST API. All the responses are JSON encoded

Android library and API to verify the safety of user devices, detect rooted devices and other risks

Provide access to BinaryEdge 40fy scanning platform

Distribute keys once for serverless applications

Botd is a browser library for JavaScript bot detection

Bugcrowd API for interacting and tracking the reported issues programmatically

Chrome extension risk scoring

CVE records with NVD KEV and EPSS enrichment

Search engine for Internet connected host and devices

Provides data of offenders from all U.S. States and Pureto Rico

An API for escaping different kind of queries

Search engine for Internet connected assets and devices

Lists of filters for adblockers and firewalls

A volunteer cybersecurity project focused on providing resources and services that improve safety across Discord

Searchable attack surface database of the entire internet

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

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

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

Metacert Link Flagging

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

Mozilla observatory http scanner

U.S. National Vulnerability Database

Scans the requesting client's IP for open TCP ports with fast or deep modes on IPv4/IPv6

Search engine for Internet connected devices

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

UK Police data

Scan and Analyse URLs

VirusTotal File/URL Analysis

VirusTotal File/URL Analysis

Virushee file/data scanning

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

SonarQube REST APIs to detect bugs, code smells & security vulnerabilities

User infrastructure for modern applications

APIs for authorization and access control

IP/domain/URL reputation

IP/domain/URL reputation

Malware execution and analysis

Email address threat and risk prediction

File and URL malware analysis powered by Falcon Sandbox

IP geolocation with VPN/proxy/Tor detection, reputation and risk score

Real-time bot detection and fraud prevention API combining IP reputation, proxy/VPN detection, and email validation in a single call

Fast, free, accurate IP geolocation and threat data (proxy/VPN/hosting detection) API

Perform OSINT via Intelligence X

IP geolocation and reputation with proxy, VPN, and hosting detection

Provide malware datasets and threat intelligence feeds

Malware Archive / file sourcing

Collect and share malware samples

Stablecoin risk, peg, liquidity, safety score, blacklist, mint/burn, yield, and chain-health data

IP/domain/URL reputation

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

Simple REST API that can scan submitted documents/files for the presence of threats

Risk scoring service from curated threat intelligence data

Bulk queries and Download Malware Samples

Database of malicious URLs used for malware distribution

Website reputation

IP/domain/URL reputation

Domain WHOIS information to detect and prevent online threats, enhancing overall online safety for individuals and organizations

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