One-stop solution with open-source SDK for mobile in-app subscription integration to iOS, Android, React Native, Flutter, Unity, or web app. Free up to $10k monthly revenue.
Shelf 4816 free tiers
Payment and Billing Integration
Services in Payment and Billing Integration that offer an ongoing free tier for developers. Limits change often — confirm on the provider's pricing page before you build on one.
Spot something outdated? Fix it upstream ↗16/16
AllRatesToday
allratestoday.com
Real-time mid-market exchange rates for 150+ currencies with official JavaScript, Python, and PHP SDKs. Free tier includes 300 requests/month over HTTPS.
Cancel flows (open-sourced), churn metrics, and revenue analytics for subscription businesses. Free forever.
Currencyapi
currencyapi.com
Free currency conversion and exchange rate data API. Free 300 requests per month, 10 requests per minute for private use.
CurrencyApi
currencyapi.net
Live Currency Rates for Physical and Cryptocurrencies, delivered in JSON and XML. The free tier offers 1,250 API requests/month.
CurrencyFreaks
currencyfreaks.com
Provides current and historical currency exchange rates. Free DEVELOPER plan available with 1000 requests/month.
currencylayer
currencylayer.com
Reliable Exchange Rates and Currency Conversion for your Business, 100 API requests/month free.
exchangerate-api.com
exchangerate-api.com
An easy-to-use currency conversion JSON API. The free tier updates once per day with a limit of 1,500 requests/month.
Exchange Rate API
exchange-rateapi.com
Real-time currency rates for 160+ currencies with 60-second updates and official SDKs. Free tier includes 300 requests/month.
FraudLabsPRO
fraudlabspro.com
Help merchants to prevent payment fraud and chargebacks. Free Micro Plan available with 500 queries/month.
FxRatesAPI
fxratesapi.com
Provides real-time and historical exchange rates. The free tier requires attribution.
Moesif API Monetization
moesif.com
Generate revenue from APIs via usage-based billing. Connect to Stripe, Chargebee, etc. The free tier offers 30,000 events/month.
ParityVend
ambeteco.com
Automatically adjust pricing based on visitor location to expand your business globally and reach new markets (purchasing power parity). The free plan includes 7,500 API requests/month.
Qonversion
qonversion.io
All-in-one cross-platform subscription management platform offering analytics, A/B testing, Apple Search Ads, remote configs, and growth tools for optimizing in-app purchases and monetization. Compatible with iOS, Android, React Native, Flutter, Unity, Cordova, Stripe, and web. Free up to $10k in monthly tracked revenue.
RevenueCat
revenuecat.com
Hosted backend for in-app purchases and subscriptions (iOS and Android). Free up to $2.5k/mo in tracked revenue.
Instant VAT number validation and EU VAT rates API, free 100 API requests/month