API Gateway Request Budget Calculator

Turn API traffic forecasts into a concrete gateway budget. Provide your monthly call volume and per-million pricing to see billable requests after caching, expected spend, and cost per call. Add an optional budget cap to highlight headroom or overruns immediately.

Total requests hitting the gateway before cache offload.
Published or negotiated per-million pricing for your plan.
Defaults to 0% if blank, representing no cache savings.
Defaults to $0 and is used to show remaining headroom or overruns.

Validate pricing, tier minimums, and caching assumptions with your cloud provider or platform team before finalizing budgets.

Examples

  • 450 million calls, $3.50 per million, 18% cache hit, $95,000 cap ⇒ Billable requests: 369,000,000 calls • Monthly gateway spend: $1,291.50 USD • Effective cost per call: $0.000004 USD • Cache savings applied: 18.00% • Budget headroom: $93,708.50 USD
  • 120 million calls, $2.80 per million, optional fields blank ⇒ Billable requests: 120,000,000 calls • Monthly gateway spend: $336.00 USD • Effective cost per call: $0.000003 USD • Cache savings applied: 0.00%

FAQ

How should I include multiple gateway tiers?

Run the calculator once per tier with its specific rate and traffic slice, then sum the outputs to reflect blended pricing.

Can I model burst pricing or minimums?

Yes. Increase the per-million rate to the effective amount you expect to pay after minimum commitments or burst surcharges.

What if caching happens outside the gateway?

Enter the overall cache hit rate regardless of where it occurs—edge CDNs, API gateway caching, or client-side memoization all reduce billable requests.

Does the tool account for request size?

No. Gateway pricing is typically request-based. If your provider charges by payload size, multiply the per-call rate accordingly before entering it here.

Additional Information

  • Cache hit rate reduces the billable request count before pricing is applied, so even modest offload materially changes spend.
  • Per-call cost is computed by dividing spend by billable requests, making it easy to benchmark internal service charges.
  • Budget headroom turns negative when projected spend exceeds your entered cap, flagging the need for plan upgrades or caching improvements.

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