{"calculator":"callback-mailbox-build-vs-buy","currency":"USD-equivalent USDC","mailbox_price_usd":"0.005","input_schema":{"polls_avoided":{"type":"integer","minimum":1,"maximum":100000},"cost_per_poll_usd":{"type":"number","minimumExclusive":0,"maximum":100}},"evaluate_url_template":"https://inversolabs.us/tools/callback-mailbox-roi.json?polls_avoided={integer}&cost_per_poll_usd={decimal}","formula":"polls_avoided * cost_per_poll_usd - mailbox_price_usd","important":"Use the buyer's measured marginal polling cost. Plain HTTP polling does not consume model tokens unless the buyer routes polling through a model.","worked_example":{"inputs":{"polls_avoided":120,"cost_per_poll_usd":"0.0001"},"avoided_cost_usd":"0.0120","net_savings_usd":"0.0070","economically_preferred":true,"illustrative_only":true}}