Pembayaran & Billing

Adapty.io

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.

https://adapty.io/

AllRatesToday

Real-time mid-market exchange rates for 150+ currencies with official JavaScript, Python, and PHP SDKs. Free tier includes 300 requests/month over HTTPS.

https://allratestoday.com

Churnkey

Cancel flows (open-sourced), churn metrics, and revenue analytics for subscription businesses. Free forever.

https://churnkey.co

Currencyapi

Free currency conversion and exchange rate data API. Free 300 requests per month, 10 requests per minute for private use.

https://currencyapi.com

CurrencyApi

Live Currency Rates for Physical and Cryptocurrencies, delivered in JSON and XML. The free tier offers 1,250 API requests/month.

https://currencyapi.net/

CurrencyFreaks

Provides current and historical currency exchange rates. Free DEVELOPER plan available with 1000 requests/month.

https://currencyfreaks.com/

currencylayer

Reliable Exchange Rates and Currency Conversion for your Business, 100 API requests/month free.

https://currencylayer.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.

https://www.exchangerate-api.com

Exchange Rate API

Real-time currency rates for 160+ currencies with 60-second updates and official SDKs. Free tier includes 300 requests/month.

https://exchange-rateapi.com

FraudLabsPRO

Help merchants to prevent payment fraud and chargebacks. Free Micro Plan available with 500 queries/month.

https://www.fraudlabspro.com

FxRatesAPI

Provides real-time and historical exchange rates. The free tier requires attribution.

https://fxratesapi.com

Moesif API Monetization

Generate revenue from APIs via usage-based billing. Connect to Stripe, Chargebee, etc. The free tier offers 30,000 events/month.

https://www.moesif.com/

ParityVend

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.

https://www.ambeteco.com/ParityVend/

Qonversion

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.

https://qonversion.io/

RevenueCat

Hosted backend for in-app purchases and subscriptions (iOS and Android). Free up to $2.5k/mo in tracked revenue.

https://www.revenuecat.com/

vatlayer

Instant VAT number validation and EU VAT rates API, free 100 API requests/month

https://vatlayer.com/