The Clay.io API is a standalone product that is not tied to the Clay.io marketplace. If you want to implement our API, you are not required to be on the marketplace. Similarly, if you want your game on the Clay.io marketplace, your game does not need our API to be implemented.
A common question developers ask us is whether the API works only on Clay.io. The answer is your game will work anywhere, whether it's your own site, the Chrome Web Store, Facebook, etc.
Many tools are provided like leaderboards, achievements, data storage, payment processing (for in-game payments), analytics, social integration, and more. Check the links to the left for further documentation on all these features.
A great tool to use is the sandbox for testing and learning API calls.
We take customer support, and the quality of our developer tools and documentation very seriously. We want to hear how you think we can improve our documentation! Let us know if anything is missing, or unclear on this documentation page, and we'll get that fixed!