Here are 10 APIs I use that are free and require no API key:
1. CoinGecko — Crypto Data
api.coingecko.com/api/v3/coins/markets?vs_currency=usd
10,000+ coins with prices, market caps, volumes.
2. Open-Meteo — Weather
api.open-meteo.com/v1/forecast
16-day forecasts for any location worldwide.
3. ip-api.com — IP Geolocation
ip-api.com/json/8.8.8.8
Country, city, ISP, ASN, VPN detection.
4. Frankfurter — Exchange Rates
api.frankfurter.app/latest?from=USD
ECB data, 30+ currencies.
5. REST Countries
restcountries.com/v3.1/name/japan
Population, languages, currencies, flags.
6. Open Library — Books
openlibrary.org/search.json?q=python
Search by title, ISBN, author, subject.
7. TheMealDB — Recipes
themealdb.com/api/json/v1/1/search.php?s=pasta
Recipes with ingredients and instructions.
8. Quotable — Quotes
api.quotable.io/quotes?tags=technology
Famous quotes by topic and author.
9. RDAP — Domain WHOIS
ICANN standard replacement for WHOIS. Registration dates, registrar, nameservers.
10. Google DNS — DNS Records
dns.google/resolve?name=stripe.com&type=MX
A, MX, NS, TXT records for any domain.
I built data tools wrapping each of these — free on Apify Store (search knotless_cadence).
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