This document provides a list of 20 APIs in 20 minutes, including APIs for Marvel, NASA, Unsplash, Europeana, Mapillary, Trafiklab, Automatic, Spotify, Everysport, SMHI, Riksdagen, Google Machine Learning, 46elks, Mailgun, Slack, OneSignal, Full Contact, Contentor, Billogram, and Open Exchange Rates. It also includes a bonus API for cats. The APIs cover a wide range of domains from entertainment to transportation to government to machine learning.

1. Image: CGP Grey
20 APIs in 20 minutes

2. Image: Malte Wingen
Andreas Krohn, 46elks.com

3. Image: Hans-Peter Gauster
API

4. Image: JD Hancock
1. Marvel

5. Image: David Menidrey
2. NASA

6. Image: Chantel Lucas
3. Unsplash

7. Image: Biblioteca Virtual del Patrimonio Bibliográfico
4. Europeana

8. Image: Martin Holmgren at Mapillary
5. Mapillary

9. Image: Nantucket Historical Association
6. Trafiklab

10. 7. Automatic
Image: The U.S. National Archive

11. Image: Dark Rider
8. Spotify

12. Image: Sandro Schuh
9. Everysport

13. Image: Sam Schooler
10. SMHI

14. Image: Janwikifoto
11. Riksdagen

15. Image: Dominik Scythe
12. Google Machine Learning

16. 13. 46elks
Image: Alexander Andrews

17. Image: Gratisography
14. Mailgun

18. Image: David Menidrey
15. Slack

19. Image: Hugo Jehanne
16. OneSignal

20. Image: Carlos E. Ramirez
17. Full Contact

21. Image: Nasjonalbiblioteket
18. Contentor

22. Image: Abigail Low
19. Billogram

23. Image: Agnueszka
20. Open Exchange Rates

24. Image: Octavio Fossatti
Bonus: The Cat API

25. Image: Malte Wingen
andreas@46elks.com