What is the easiest free API to start with?

Cat Facts (catfact.ninja) for the concept, Open-Meteo for something genuinely useful. Both are keyless and CORS-friendly.

Do I need to pay for an API key?

No. A "free key" is still free — it is an account token that unlocks a quota. If a site asks for a card to get a "free" key, it is a trial, not a free tier.

Can free APIs disappear?

Yes — which is why this directory re-checks weekly and publishes the results instead of pretending otherwise.

The Beginner’s Guide to Free APIs (2026): What They Are, Where to Find Good Ones, What to Avoid

The short answer: a free API is a service that gives your app real data — weather, movies, prices, pictures — for zero money, either with no signup at all or with a free account key. The good ones are wonderful; the lists pointing to them are full of dead ones. This guide teaches you to tell the difference in about ninety seconds per API.

Free vs free-tier (the distinction that matters)

Keyless free: no account, no key, call it now. Open-Meteo, PokeAPI, Cat Facts. Perfect for learning and demos.
Free key: sign up (a minute), get a key, get a monthly quota. NASA, TMDB, GitHub. Usually more reliable — the key means the limits are yours, not shared with the whole internet.
"Free" trial in a trench coat: card required, 14 days, then paid. Not in this directory, and you should run from it too.

The 90-second quality check

Does the endpoint answer right now? (Our catalog shows the last live check — or run it in the playground.)
Is the free limit printed in real numbers? "Generous limits" is marketing; "1,000 calls/day" is a contract.
If your project is browser-only: does it have CORS ✓?
Is it HTTPS? In 2026, a plain-HTTP API is a red flag with a URL.

Your starter shortlist

Weather: Open-Meteo. Practice data: JSONPlaceholder. Fun: Cat Facts and JokeAPI. Pictures: Picsum. Something impressive: NASA (free key, two minutes). The ranked no-key list has fifteen more.

Mistakes every beginner makes (we made them too)

Committing the key to GitHub. Bots find it in seconds. Keys live in .env files — our key-safety guide explains.
Polling like the API is free infrastructure. It is someone's server and someone's bill. Cache, debounce, be polite — free tiers die from abuse.
Building the whole app on an API you never tested. Ten minutes in a playground saves a weekend of archaeology.

Next steps

Read the fetch() guide, steal a starter bundle, and build one small thing this week. APIs are learned by calling them — you now know enough to start.