Free Public APIs That Need No API Key (2026 List)

Curated list of free APIs you can use without signing up. Every entry includes a curl example.

Developer Tools

# DevToolKit - 28 endpoints
curl http://5.78.129.127/api/ssl/example.com
curl http://5.78.129.127/api/dns/lookup/example.com
curl http://5.78.129.127/api/hash?text=hello&algo=sha256

# httpbin - HTTP testing
curl https://httpbin.org/ip

# JSONPlaceholder - Fake REST API
curl https://jsonplaceholder.typicode.com/posts/1

# IP geolocation
curl https://ipapi.co/json/

Crypto & Finance

# CoinGecko prices
curl "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd"

# USD to sats
curl http://5.78.129.127/api/crypto/sats?usd=10

Security

# Password breach check
curl https://api.pwnedpasswords.com/range/5BAA6

# SSL + security headers
curl http://5.78.129.127/api/headers/inspect?url=https://example.com

Data & Fun

# Weather
curl "wttr.in/London?format=j1"

# Country info
curl "https://restcountries.com/v3.1/name/japan"

# Random cat
curl "https://api.thecatapi.com/v1/images/search"

→ Full interactive list with search

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