Issue to be solved

Some apis require a capability to be called and if you want to use them in a one-off manner it is a bit cumbersome to issue a capability and then delete it via its controller later on. Or to manage looking up an existing capability for the same path. Therefore i suggest an api where you can issue a capability that effectively have an instant lifetime, so after the transaction is done its controller will delete it.

I guess a variant of this could be that you could define a capability that you want to be valid for a certain amount of blocks time. This could be a very nice primitive to use if you want to create a listing that is only valid for a month for instance. Since if the underlying cap providing a resource is not valid the listing should not be valid.

Suggested Solution

Implmenet an api for issuing a capability that is instant or can live for a certain interval before beeing invalidated.