API providers use token-based billing to price requests fairly. One credit typically equals one simple API call, but compute-intensive operations like PDF parsing or AI inference cost more credits.

This model reflects real resource usage. Unlike flat per-call pricing, credits let developers pay for actual processing time. Lightweight lookups might cost 1 credit, while heavy tasks consume 5-20.

Smart usage tracking and client-side validation can stretch your credit balance. Caching frequent responses and batching requests also lower costs. Most platforms offer programmatic usage endpoints.

Before scaling, estimate your credit consumption. A monthly 900K API calls at 1 credit each means 900K credits needed. Double that estimate — real-world usage often exceeds projections.