API Billing, Pricing & Cost Estimate Tools
Estimate API costs, calculate API pricing, model usage-based billing, and understand how much to charge for paid API access.
Start with the decision you need to make
Each high-intent page has one job: estimate delivery cost, set a sustainable selling price, explain API charges, compare pricing examples, or design a paid API plan.
Estimate API cost
Calculate monthly request, token, fixed, and retry costs before you choose a selling price.
Open the API cost calculatorSet API pricing
Turn delivery cost, fees, refunds, and a target margin into a sustainable paid API price.
Open the API pricing calculatorCompare subscription vs API cost
Estimate cost per 1M tokens, break-even usage, and relay economics for ChatGPT Codex subscriptions versus direct API use.
Compare subscription and API costUnderstand API fees and charges
See how request, token, credit, subscription, overage, and rounding rules appear on an invoice.
Read the charges guideCompare API pricing examples
Review worked request, token, credit, subscription, overage, and tiered pricing examples.
Compare pricing examplesDesign a paid API plan
Choose a billable unit, calculate delivery cost, set margin, and publish clear plan terms.
Learn how to price an APIForecasting product demand? Use the usage-based API billing guide before setting quotas and overage rules.
Built for the daily reality of API relay operators.
Compare what customers consumed, what providers charged, and what payment processors settled without treating prepaid top-ups as earned service revenue.
All tools for API platforms
Everything needed to plan, price, and protect paid API access.
API Billing Reconciliation
Match downstream usage, upstream charges, and payment settlements to find missing records, billing drift, wallet funding errors, and negative-margin API traffic.
Open tool →API Cost Estimate Calculator
Estimate monthly API costs and API fees from requests, input and output tokens, per-request charges, fixed costs, and a safety buffer. Compare cost per request and per 1,000 requests before setting a price.
Open tool →AI Model Cost Calculator
Compare editable AI API price presets and estimate token costs, cache savings, monthly usage, gateway margin, and sustainable pricing.
Open tool →AI Subscription vs API Cost Calculator
Compare ChatGPT Codex subscription plans with direct API usage, estimate cost per 1M tokens and break-even usage, then model relay revenue, cost, profit, and gross margin.
Open tool →API Usage Billing Calculator
Project daily users, requests, token volume, monthly spend, and usage-based API billing for paid API keys.
Open tool →API Rate Limit Calculator
Compare RPM, TPM, concurrency, latency, and user request frequency to design practical rate limits.
Open tool →API Pricing Calculator for Paid APIs
Set a paid API price from delivery cost, selling price, payment fees, refunds, bad debt, and volume. Calculate margin, net profit, and break-even usage.
Open tool →Prompt Cache Savings Calculator
Compare uncached and cached input token costs and estimate monthly prompt caching savings.
Open tool →Batch API Savings Calculator
Compare realtime and batch token processing costs for asynchronous AI API workloads.
Open tool →AI Context Window Calculator
Check whether system prompts, history, tools, user input, and reserved output fit within a model context window.
Open tool →API Budget & Quota Calculator
Turn a monthly API budget into token, request, and per-user usage quotas with an operating reserve.
Open tool →API Credits & Token Converter
Convert an API credit balance into dollar value, token capacity, request capacity, and estimated months of usage.
Open tool →AI Model Routing Cost Calculator
Estimate savings from routing a share of token traffic to a lower-cost model while preserving premium capacity.
Open tool →API Pricing Tier Calculator
Design a sustainable monthly API plan price from included usage, utilization, fixed costs, fees, and target margin.
Open tool →API SLA Downtime Calculator
Convert an uptime target into allowed downtime and track remaining monthly error budget.
Open tool →API Key Policy Generator
Generate plain-English API key usage rules, billing terms, refund language, and acceptable use policy sections.
Open tool →Guides and resources
Practical API billing explainers with formulas, examples, and tables that help real builders make pricing decisions.
Browse guides