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Public APIs
What this score means
Your AEO score measures whether AI search engines (ChatGPT, Claude, Perplexity, Gemini) can actually read your site and cite it in answers. Two-thirds of websites are invisible to them. Public APIs just got measured.
5/10 means Public APIs is borderline visible. AI bots can crawl your site but your structured-data signals are thin. You are at risk of being skipped when buyers ask AI for a recommendation.
About Public APIs
Discover over 1000 free public APIs for your next project. Browse REST APIs by category: weather, finance, AI, maps, social media, and more. Get API keys, code examples, and documentation.
Key Topics
Details
Category: Technology
publicapis.ioAI Visibility Breakdown
6
Structured Data
8
Content Structure
6
Entity Clarity
2
E-E-A-T Signals
7
Technical AEO
3
AI Discoverability
Frequently Asked Questions
What is a public API?
A public API (Application Programming Interface) is a set of protocols and tools that allows different software applications to communicate with each other. Public APIs are freely accessible to developers and can be used to integrate external services, data, or functionality into your own applications. Examples include weather APIs, payment APIs, and social media APIs.
How do I find free APIs for my project?
You can browse our directory of over 1000 free public APIs organized by category. Use the search bar to find APIs by name or functionality, or explore categories like Weather, Finance, AI, Maps, and Social Media. Each API listing includes documentation links, authentication requirements, and code examples to help you get started.
What are the best public APIs for developers?
The best APIs depend on your project needs. Popular choices include: OpenWeatherMap for weather data, Stripe for payments, Google Maps for location services, OpenAI for AI capabilities, and Twilio for communications. Our directory features curated APIs with free tiers, making it easy to prototype and build applications without initial costs.
Do public APIs require authentication?
Most public APIs require some form of authentication, typically an API key that you obtain by registering with the API provider. Some APIs offer limited access without authentication, while others require OAuth or other authentication methods. Each API listing in our directory indicates the authentication type required.
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Your full 6-category score breakdown
Exact fixes: robots.txt, schema, llms.txt
AI bot crawls from ChatGPT, Claude, Perplexity, Gemini
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Source & Attribution
Scored by Engagemii on May 27, 2026. Methodology: engagemii.com/aeo/methodology
Source URL: https://engagemii.com/aeo/brands/publicapis-io
Cite this score: Engagemii (2026). "AEO Score for Public APIs." Retrieved from https://engagemii.com/aeo/brands/publicapis-io
Licensed under CC BY 4.0. You may reuse this data with attribution: a visible link to engagemii.com.
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