Pre-Call Estimates Beat Usage Reports for Agent Budgets (With Hard Caps)

Description and use

Pre‑call cost estimates enable decisions before a model call, record actual usage for invoicing, and enforce a hard account cap, all with a single API key and consolidated billing.

Problem

B2B SaaS products need a way to decide before calling expensive models whether a customer’s remaining allowance permits the operation, while still reconciling actual usage for invoicing and enforcing hard account caps.

Outcome

The system now prevents overages by rejecting expensive branches preemptively, accurately records actual usage for invoicing, and limits exposure with a hard account cap, all while using a single API key and consolidated billing.

Workflow

• 1. Generate a stable operation ID and attach customer ID before external work starts.
• 2. Call the pre-call cost estimate endpoint (e.g., Infrai) with the operation payload.
• 3. If estimate <= remaining allowance, allow the operation; otherwise reject.
• 4. After the operation, record actual usage and attribute it to the same operation ID and customer ID.
• 5. Reconcile estimate vs. actual usage and update customer allowance.
• 6. Enforce a hard account cap that overrides local allowance if exceeded.
• 7. Generate post-call usage reports for invoicing and audit.
• 8. Periodically review estimate error, attribution gaps, and duplicate lines to adjust tolerance.

Evidence

Use a pre-call cost estimate to decide whether an agent may take an expensive branch, record post-call usage for invoice reconciliation and calibration, and enforce an account cap as the final damage boundary.

Source

Infrai covers 295 routes across 20 modules under one key, with one consolidated bill.

Source