Seems like maybe this is over complicating it. The service provider shouldn’t care who or _what_ is making the requests to their APIs. 10 agents should just be billed as if it were 10 people. I don’t see a reason for the service to “be nice” and charge less because the client’s agents are shitty and need 10 requests to do something that should have only taken a fraction of that.
In concrete technical terms you might be right but lots of companies have to deal with aftercare and lots of customers really care about the agent actually did or did not do the work