Security APIs add threat intelligence and protection to your stack — IP reputation, vulnerability databases, malware scanning, and breach lookups. Community projects like abuse.ch publish free feeds, while enterprise services meter by query volume. These APIs often handle sensitive context, so review each provider's data-retention policy alongside its technical limits.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| 1,000,000+ Recipe and Grocery List API (v2) API #Documentation This is the documentation for the partner endpoint of the BigOven Recipe and Grocery List API. The update brings with it Swagger-based documentation. [Swagger](http://swagger.io) is an emerging standard fo | Unknown | Unknown | Yes | Profile | |
| 1Password Connect API REST API interface for 1Password Connect. | Free | Unknown | Yes | Profile | |
| AWS CognitoIdentity API Official AWS CognitoIdentity service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS CognitoIdentityServiceProvider API Official AWS CognitoIdentityServiceProvider service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS CognitoSync API Official AWS CognitoSync service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS GuardDuty API Official AWS GuardDuty service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS IAM API Official AWS IAM service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Inspector API Official AWS Inspector service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS KMS API Official AWS KMS service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SecretsManager API Official AWS SecretsManager service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Shield API Official AWS Shield service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS WAF API Official AWS WAF service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS WAFRegional API Official AWS WAFRegional service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AltoroJ REST API AltoroJ REST API public API. | Unknown | Unknown | Yes | Profile | |
| Api2Pdf - PDF Generation, Powered by AWS Lambda API # Introduction [Api2Pdf](https://www.api2pdf.com) is a powerful PDF generation API with no rate limits or file size constraints. Api2Pdf runs on AWS Lambda, a serverless architecture powered by Amazon to scale to million | Free | API Key | Yes | Profile | |
| Application Environment Verification Android library and API to verify the safety of user devices, detect rooted devices and other risks | Free | API Key | No | Profile | |
| Authentiq API Strong authentication, without the passwords. | Unknown | Unknown | Yes | Profile | |
| Authorized Partner API Specification API To access files in user’s DigiLocker account from your application, you must first obtain user’s authorization. | Unknown | Unknown | Yes | Profile | |
| Azure Attestation API Official Microsoft Azure REST API OpenAPI specification for specification/attestation/data-plane/Attestation/stable/2025-06-01/attestation.json. | Paid | Unknown | Yes | Profile | |
| Azure Authorization API Official Microsoft Azure REST API OpenAPI specification for specification/authorization/resource-manager/Microsoft.Authorization/Authorization/stable/2022-04-01/authorization-RoleDefinitionsCalls.json. | Paid | API Key | Yes | Profile | |
| Billbee API Documentation of the Billbee REST API to connect a Billbee account to external aplications. ## Endpoint The Billbee API endpoint base url is https://api.billbee.io/api/v1 ## Activation You have to enable the API in the s | Paid | Unknown | Yes | Profile | |
| BinaryEdge Provide access to BinaryEdge 40fy scanning platform | Freemium | API Key | No | Profile | |
| BitWarden Best open-source password manager | Freemium | OAuth | No | Profile | |
| Botd Botd is a browser library for JavaScript bot detection | Free | API Key | No | Profile | |
| Brain Web API This document describes the [Intellifi Brain](https://intellifi.zendesk.com/hc/en-us/categories/360000685454) Web API specification using the [OpenAPI specification](https://github.com/OAI/OpenAPI-Specification). The Bra | Paid | Unknown | Yes | Profile | |
| BrandLovers Marketplace API V1 API Allows sellers to: 1) Load products definitions to the BrandLovers marktplace. 2) Receive and update orders status. 3) Receive and update shipping information. 4) Receive and update customer tickets. All requests consume | Unknown | Unknown | Yes | Profile | |
| Bugcrowd API Bugcrowd API: crowdsourced vulnerability disclosure, bug bounty programs, and security reports. | Paid | API Key | No | Profile | |
| CSR.plus API Generate certificate signing requests and private keys without OpenSSL | Free | API Key | Yes | Profile | |
| Car Registration API Car Registration API, An API that retrieves car information from its numberplate in many countries worldwide, uncluding the USA, UK, India, Australia and most of Europe. A username and password is required to access the | Free | Unknown | Yes | Profile | |
| Censys Search engine for Internet connected host and devices | Freemium | API Key | No | Profile | |
| Classify API Encrypting & decrypting text messages | Unknown | Unknown | Yes | Profile | |
| Complete Criminal Checks Provides data of offenders from all U.S. States and Puerto Rico | Paid | API Key | No | Profile | |
| ConfigCat Public Management API **Base API URL**: https://api.configcat.com If you prefer the swagger documentation, you can find it here: [Swagger UI](https://api.configcat.com/swagger). The purpose of this API is to access the ConfigCat platform prog | Free | Unknown | Yes | Profile | |
| Credas API Credas API public API. | Free | Unknown | Yes | Profile | |
| CyCAT.org API CyCAT - The Cybersecurity Resource Catalogue public API services. | Unknown | Unknown | Yes | Profile | |
| Dataflow Kit Web Scraper API Render Javascript driven pages, while we internally manage Headless Chrome and proxies for you. - Build a custom web scraper with our Visual point-and-click toolkit. - Scrape the most popular Search engines result pages | Free | Unknown | Yes | Profile | |
| Dehash.lt API Hash decryption MD5, SHA1, SHA3, SHA256, SHA384, SHA512 | Unknown | API Key | Unknown | Profile | |
| Domain Intelligence API DNS, WHOIS/RDAP, SSL, subdomain enumeration, and email security in one parallel call | Free | API Key | No | Profile | |
| EmailRep Email address threat and risk prediction | Freemium | No | No | Profile | |
| Escape An API for escaping different kind of queries | Freemium | No | No | Profile | |
| Events API 1Password Events API Specification. | Paid | API Key | Yes | Profile | |
| Ex Libris APIs API For more information on how to use these APIs, including how to create an API key required for authentication, see [Alma REST APIs](https://developers.exlibrisgroup.com/alma/apis). | Unknown | Unknown | Yes | Profile | |
| FilterLists Lists of filters for adblockers and firewalls | Free | No | No | Profile | |
| FingerprintJS Pro Fraud detection API offering highly accurate browser fingerprinting | Paid | API Key | No | Profile | |
| FraudLabs Pro Screen order information using AI to detect frauds | Freemium | API Key | No | Profile | |
| FullHunt Searchable attack surface database of the entire internet | Freemium | API Key | Yes | Profile | |
| GitGuardian Scan files for secrets (API Keys, database credentials) | Freemium | API Key | No | Profile | |
| Google Access Approval API Official Google Access Approval API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Access Context Manager API Official Google Access Context Manager API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Agent Identity API Official Google Agent Identity API REST API (v1alpha) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Agent Identity Credentials API Official Google Agent Identity Credentials API REST API (v1alpha) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Certificate Authority API Official Google Certificate Authority API REST API (v1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Certificate Manager API Official Google Certificate Manager API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Chrome Verified Access API Official Google Chrome Verified Access API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Cloud Identity API Official Google Cloud Identity API REST API (v1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Cloud Identity-Aware Proxy API Official Google Cloud Identity-Aware Proxy API REST API (v1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Cloud Key Management Service (KMS) API Official Google Cloud Key Management Service (KMS) API REST API (v1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google IAM Service Account Credentials API Official Google IAM Service Account Credentials API REST API (v1) discovered via Google APIs Discovery Service. | Free | API Key | Yes | Profile | |
| Google Identity Toolkit API Official Google Identity Toolkit API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Identity and Access Management (IAM) API Official Google Identity and Access Management (IAM) API REST API (v2beta) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google KMS Inventory API Official Google KMS Inventory API REST API (v1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Parameter Manager API Official Google Parameter Manager API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Policy Simulator API Official Google Policy Simulator API REST API (v1alpha) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Policy Troubleshooter API Official Google Policy Troubleshooter API REST API (v1beta) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Public Certificate Authority API Official Google Public Certificate Authority API REST API (v1alpha1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Secret Manager API Official Google Secret Manager API REST API (v1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Security Posture API Official Google Security Posture API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | OAuth | Yes | Profile | |
| Google Serverless VPC Access API Official Google Serverless VPC Access API REST API (v1beta1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Smart Device Management API Official Google Smart Device Management API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| GreyNoise API GreyNoise Intelligence API for identifying mass-internet scan noise, enriching IPs with context about scanners and benign/malicious classification. | Freemium | API Key | No | Profile | |
| HackerOne The industry’s first hacker API that helps increase productivity towards creative bug bounty hunting | Freemium | API Key | No | Profile | |
| HaveIBeenPwned Passwords which have previously been exposed in data breaches | Freemium | API Key | No | Profile | |
| Hubhopper Partner Integration API(s) - Production API This is an interactive document explaining the API(s) that could be used to fetch data from [Hubhopper](https://hubhopper.com). Use the api key provided to authorize `x-api-key` and test the API(s). The output data model | Unknown | Unknown | Yes | Profile | |
| IP2Proxy Detect proxy and VPN using IP address | Freemium | API Key | No | Profile | |
| Influx OSS API Service API # Authentication <!-- ReDoc-Inject: <security-definitions> --> | Paid | Unknown | Yes | Profile | |
| Intelligence X Perform OSINT via Intelligence X | Freemium | API Key | No | Profile | |
| Ix Api IX-API This API allows to config/change/delete Internet Exchange services. # Filters When querying collections, the provided query parameters are validated. Unknown query parameters are ignored. Providing invalid filter values | Unknown | Unknown | Yes | Profile | |
| KumpeApps API KKid API. Due to security concerns all calls to this API requires authentication. If you have access then you may use your KumpeApps username/password to authenticate. To gain access please use the contact developer link | Unknown | Unknown | Yes | Profile | |
| Labs64 NetLicensing RESTful API Test Center API The Labs64 <a href='https://netlicensing.io/wiki/restful-api' target='_blank'>NetLicensing RESTful API</a> gives you access to NetLicensing’s core features.<br/><br/><strong>Authentication</strong><br/>You authenticate t | Free | Unknown | Yes | Profile | |
| LeakInsight Find leaked or exposed credentials by email, username, phone, domain, hash, or breach origin | Free | API Key | No | Profile | |
| LoginRadius Managed User Authentication Service | Freemium | API Key | Yes | Profile | |
| Microsoft Security Response Center (MSRC) Programmatic interfaces to engage with the Microsoft Security Response Center (MSRC) | Free | No | Yes | Profile | |
| Mozilla http scanner Mozilla observatory http scanner | Free | No | No | Profile | |
| Mozilla tls scanner Mozilla observatory tls scanner | Free | No | No | Profile | |
| National Vulnerability Database U.S. National Vulnerability Database | Free | No | No | Profile | |
| OWASP ZAP Automated security testing API for web apps | Free | No | No | Profile | |
| Passwordinator Generate random passwords of varying complexities | Free | No | No | Profile | |
| Pendo Feedback API ## Who is this for? This documentation is for developers creating their own integration with [Feedback's](https://www.pendo.io/product/feedback/) API. If you are doing a standard integration, there's a really easy [Javas | Free | API Key | Yes | Profile | |
| PhishStats Phishing database | Free | No | No | Profile | |
| Privacy.com Generate merchant-specific and one-time use credit card numbers that link back to your bank | Freemium | API Key | No | Profile | |
| Pulsedive Scan, search and collect threat intelligence data in real-time | Freemium | API Key | No | Profile | |
| SecurityTrails Domain and IP related information such as current and historical WHOIS and DNS records | Freemium | API Key | No | Profile | |
| Shodan API Shodan API for internet-connected device discovery: search banners, ports, vulnerabilities, and host intelligence across the global scan database. | Freemium | API Key | Yes | Profile | |
| Slack Web API One way to interact with the Slack platform is its HTTP RPC-based Web API, a collection of methods requiring OAuth 2.0-based user, bot, or workspace tokens blessed with related OAuth scopes. | Unknown | Unknown | Yes | Profile | |
| Spyse Access data on all Internet assets and build powerful attack surface management applications | Paid | API Key | No | Profile | |
| Text Analytics & Sentiment Analysis API | api.text2data.com API <p>The current api version is <b>v3.4</b></p><br><br><p>The api methods listed below can be called directly from this page to test the output. You might set the api_key to pre-authenticate all requests on this page (this | Free | API Key | Yes | Profile | |
| The Blue Alliance API v3 API # Overview Information and statistics about FIRST Robotics Competition teams and events. # Authentication All endpoints require an Auth Key to be passed in the header `X-TBA-Auth-Key`. If you do not have an auth key yet, | Paid | Unknown | Yes | Profile | |
| Tradeworks API Authentication is required to access all methods of the API. Enter username and password. Credentials are automatically set as you type. | Unknown | Unknown | Yes | Profile | |
| Turbine Labs API The Turbine Labs API provides CRUD operations for core object types, and is mostly RESTy. The easiest way to interact with the API is with [tbnctl](https://docs.turbinelabs.io/advanced/tbnctl.html). If you want to make d | Free | Unknown | Yes | Profile | |
| UK Police UK Police data | Free | No | No | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great security API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.