This is a compilation of APIs helpful for automating Open Source Intelligence (OSINT) tasks. It covers various categories, including IOT/IP search engines like Shodan and Censys, offering device and host data. Universal OSINT APIs such as Social Links provide email and social media lookups, some at a cost. Phone number lookup and verification services include Numverify and Twilio, with varying pricing models. Address and ZIP code lookup APIs like Global Address and Google Maps Geocoding are listed, some providing free access. Services for people and document verification, such as Approuve.com and Onfido.com, are included, primarily for identity checks. Business and entity search APIs like Open Corporates and LinkedIn are provided for company information retrieval. Domain, DNS, and IP lookup tools like API OSINT DS and InfoDB API offer information on domains and IP addresses. Mobile app endpoint APIs and web scraping tools like WebScraping.AI are listed for mobile and web data extraction. Finally, the compilation includes APIs for WHOIS data, geolocation, Wi-Fi lookup, network information, finance, email validation, name analysis, leaked data searches, web archives, hash decryption, and cryptocurrency information.