Mintlify
For programmatically generating documentation for code
Programming · API key · HTTPS
Programming APIs
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Ordered by reported HTTPS, CORS support, no-auth access, then changed/observed facts. Access signals are not a popularity or quality score.
KONTESTS
For upcoming and ongoing competitive coding contests
Programming · No auth · HTTPS
Codeforces
Get access to Codeforces data
Programming · API key · HTTPS
Hackerearth
For compiling and running code in several languages
Programming · API key · HTTPS
Judge0 CE
Online code execution system
Programming · API key · HTTPS