Public APIs, no key needed
835 free APIs across 48 categories that work with no signup and no API key. Curated from the public-apis directory, useful for prototypes, hackathons and learning.
Animals
20 free
Anime
10 free
Anti-Malware
2 free
Art & Design
12 free
Blockchain
8 free
Books
18 free
Business
10 free
Calendar
12 free
Cloud Storage & File Sharing
4 free
Cryptocurrency
32 free
Currency Exchange
12 free
Data Validation
2 free
Development
74 free
Dictionaries
5 free
Documents & Productivity
3 free
Email
9 free
Entertainment
15 free
Environment
13 free
Finance
18 free
Food & Drink
11 free
Games & Comics
69 free
Geocoding
48 free
Government
80 free
Health
29 free
Jobs
8 free
Machine Learning
9 free
Music
11 free
News
7 free
Open Data
35 free
Open Source Projects
8 free
Patent
2 free
Personality
20 free
Phone
1 free
Photography
6 free
Programming
1 free
Science & Math
34 free
Security
19 free
Shopping
1 free
Social
9 free
Sports & Fitness
21 free
Test Data
25 free
Text Analysis
1 free
Tracking
3 free
Transportation
39 free
URL Shorteners
10 free
Vehicle
4 free
Video
28 free
Weather
17 free
Dataset: public-apis/public-apis (MIT). Only "no auth" entries are listed: anything that needs a key, OAuth or signup is excluded. Statuses (HTTPS/CORS) are as listed upstream and may drift. The linked docs are authoritative.