API costs

AI API cost planning for small products

AI API costs are easy to underestimate because early testing is small. Once real users arrive, requests, retries, longer prompts, and background jobs can turn a cheap prototype into a meaningful monthly expense.

Estimate usage before launch

• Expected active users per month.
• AI requests per user per session.
• Average prompt and response size.
• Retries, failed requests, and background summaries.
• Growth assumptions for the next three months.

Ways to reduce API cost

Cache repeated responses, shorten prompts, use smaller models for simple tasks, summarize long inputs before analysis, and avoid running AI on actions that do not need it. Good product design can reduce spend without hurting the user experience.

Set guardrails

Small products should set usage alerts, per-user limits, and internal dashboards before public launch. A single bug or automated loop can create unexpected cost.

Planning advice

Model conservative, normal, and high-usage scenarios. Add the estimated API calls and rate into the AI tool budget calculator so API spend appears beside subscriptions and add-ons.