Whenever we design or build something, we often need multiple APIs to power different features and services. But one common challenge developers face is finding the right APIs.

Some APIs are paid, while many others are available for free, but discovering reliable free APIs can be difficult. Because of this, developers sometimes struggle to build their projects properly or end up paying for services unnecessarily.

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To solve this problem, I explored several web pages and developer resources and came across a very useful GitHub repository that contains a large collection of APIs.

In this blog, I’m going to review that repository and answer some important questions: Are these APIs reliable? Should you use them in your projects? What are their advantages and limitations? Which types of projects can benefit from them? And what should you keep in mind before using a free API?

You’ll find all of these answers in this complete review.

So, make sure you read the blog until the end. And if you face any problems, have questions, or have something to add, feel free to leave a comment below. I’d be happy to discuss it with you.

What Is the Public APIs GitHub Repository?

Public APIs is a collection of links and brief metadata about services. You browse it, follow a listing, and evaluate the provider behind that service.

It is not a universal gateway that supplies all those APIs through one endpoint. It does not host every listed service, issue every provider’s credentials, or control their availability. Your application normally communicates with the selected provider, not with the GitHub list.

The README also links to a separate project offering an API for the directory. That reference does not turn the repository into the operator of its listed services. Verify that separate project’s current status before using it programmatically.

How Does the Public APIs List Work?

A listing is a compact starting point. The contribution guide defines authentication and CORS labels. Read them as recorded metadata, then confirm them in provider documentation.

Field	What it tells you	What it does not establish
API	Service name and linked documentation or website	Provider suitability or endpoint stability
Description	Brief summary of functionality	Complete feature coverage or data quality
Auth	Reported authentication method, such as apiKey, OAuth or No	Exact permissions, registration steps or token lifetime
HTTPS	Whether secure HTTP support is reported	A complete security assessment
CORS	Reported cross-origin browser support: Yes, No or Unknown	Compatibility with every origin, method and header
Category	Topic section containing the listing	A quality ranking

The category is generally the section heading rather than an extra column. Some repository sections also include links to Postman collections.

For example, the Animals section lists Dogs with Auth: No, HTTPS: Yes and CORS: Yes. That makes it a candidate for a browser demo. It does not establish commercial image rights, unlimited requests or guaranteed uptime. Follow Dog CEO’s own documentation before deciding to integrate it.

Are Public APIs Real or Fake?

It is a real, publicly accessible GitHub repository with source files, contribution instructions, issues, and pull requests. There is no basis in those materials for calling the directory fake or a scam.

When checked on 6 October 2026, GitHub’s README page showed the latest file commit dated 5 October 2026. The pull-request page included submissions dated 6 October. These observations show recent repository activity, not comprehensive maintenance of every listing.

Is It Actually Free?

Reading the list is free. Individual services are a separate question.

The contribution rules accept APIs with full free access or at least a free tier. Therefore, “free APIs” can include services with paid plans, limited quotas or restricted features. A free tier may be enough for learning and too small for a public application.

The MIT license applies to the repository material under that license. It does not automatically grant rights to third-party API data, photographs, trademarks or software. Commercial access and redistribution depend on the individual provider’s terms and any applicable content licenses.

How to Test an API Before Using It

Use a documented, read-only endpoint with non-sensitive test data. Dog CEO’s official page provides this example:

curl –max-time 10 -i https://dog.ceo/api/breeds/image/random

This is an example request, not a claim that an endpoint test was performed for this review. Inspect the status, content type and response body when you run it. Confirm that the returned structure matches the documentation and contains the data your feature needs.

A working documentation page is insufficient. Test the endpoint with your chosen account and authentication method. Check what happens with invalid input, missing credentials, and an empty result. Observe documented rate-limit headers without deliberately overwhelming the service.

If your application runs in a browser, test from its actual origin. A successful command-line request does not prove browser compatibility. As MDN’s CORS documentation explains, browsers use server-supplied headers to determine which cross-origin responses scripts can access. Requests involving certain methods or headers also require a preflight.

One successful call establishes a working example at that moment. It does not establish long-term uptime, predictable latency or contractual support.

Important Things to Check Before Integration

Security starts with the request you send. Use HTTPS and verify the destination domain. Keep private API keys out of public repositories, browser bundles, and shared logs. Where a provider supports browser-safe public credentials, follow its restrictions rather than treating all keys alike.

Review what leaves your application. Search terms, coordinates, email addresses, uploaded files, and user identifiers may reach the provider. Check retention, logging, sharing, and deletion policies when those details affect your users. Use only the information necessary for the task.

Validate incoming data as well. Handle missing fields and unexpected types. Do not execute returned content or render untrusted HTML without appropriate controls.

Compatibility also includes pagination, response size, language coverage, and update frequency. An API can respond correctly yet provide stale information or omit the regions your customers need. These questions are absent from a short directory row and require direct verification.

Advantages of Public APIs

• Easier API discovery: Category browsing helps you find suitable APIs without searching for every provider separately.
• Quick initial comparisons: Metadata about authentication, HTTPS and CORS helps you shortlist options.
• Useful for learning: Provides practical opportunities to practice API requests, JSON parsing and error handling.
• Helpful for prototypes: Lets you test features before investing in a more involved integration.
• Community contributions: Users can suggest additions and corrections through pull requests.
• Clear contribution guidelines: Requirements cover alphabetical ordering, documentation and listing format.
• Transparent validation: Open-source checking tools let developers inspect what is actually validated.

Disadvantages of Public APIs

• Third-party dependency: Providers can change endpoints, pricing, credentials, or terms independently of the directory.
• Potentially outdated metadata: Authentication details and free-access information may no longer reflect current requirements.
• No guaranteed service quality: Documentation, support, reliability, and service-level agreements must be checked with each provider.
• Limited validation: The link validator checks duplicates and link responses, with exceptions for recognized Cloudflare protection.
• Checks are not comprehensive audits: They do not verify every service’s authentication, pricing, privacy practices or production performance.
• Automation does not guarantee availability: The GitHub Actions workflows do not establish that every listed API currently works.

Final Verdict

Public APIs GitHub is useful for discovery, research, learning and prototyping. Its organization and metadata help developers find candidates quickly, while its public contribution process supports corrections.

Before integration, verify the individual API’s documentation, pricing, terms, limits, security, and reliability. The directory helps answer “Where could I get this capability?” The provider evaluation answers “Can my application depend on it?” That distinction is what makes the repository useful without asking it to provide guarantees it cannot establish.