I've spent some time watching the #developers channel in the Splinterlands Discord servers and every so often someone comes in asking if there is any documentation. There's been a Google Docs spreadsheet (here) but I decided to expand this list with examples on GitHub.
https://github.com/kiokizz/Splinterlands-API
Example:
For those developing anything related to Splinterlands and would like to contribute feel free to make suggestions or corrections. Hopefully this will be of use to someone else considering building something in the Splinterlands sphere.
I intend to at some point to start documenting the games custom JSONs with JavaScript examples and will likely include them in this repository.
Enjoy the rest of your day :)
