License activation and serial management.

Hello everyone,

(Again, sorry if this is the incorrect forum for this.)

I'm having trouble finding an online activation service (well, I found one, but I don't want to pay as much as they require: http://wyday.com/limelm/signup/).

I would like the service to perform the following tasks:

• Allow activation over HTTP, ie: I'd send a license key and a unique identified to the server, and it would activate the copy.
• Allow serial generation over HTTP via an API, preferably JSON.
• Allow me to revoke a serial key.
• Preferably "Pay as you use" pricing... something that doesn't expire or require a monthly fee.

Would something like this be valuable to the community if one doesn't exist?

Thanks in advance!