How to calculate marginal cost and contribution

Contribution margin for a machine-sold call is price minus the variable cost of producing that call minus the expected cost of failed retries. That is arithmetic on observed numbers. It is not a revenue forecast and it is not guaranteed income.

If you buy an upstream paid API, add that cost. If you cannot measure it, do not invent it. zFinia will not publish private opportunity scores, expectedNetOverTtl, or private margins.