Is there a way to view or generate a Contact's checksum via the REST API?
I'm looking to use the checksum to provide relevant form links, etc., but need to get it programmatically on a Contact basis. Any and all insight is appreciated. Thanks!
I'm pretty certain you can't get a checksum from the standard API. However, you should write (or commission) an extension to provide a checksum API. The API would basically be a wrapper around the code that DaveD suggested, and you can read documentation here on how to use Civix to generate an API in your extension.
I needed this exact functionality, so I wrote the extension that provides it, com.megaphonetech.checksums. I used Coleman's comment above as my spec :)