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 ## Payment and Billing Integration
 
+  * [Adapty.io](https://adapty.io/) – One-stop solution with open-source SDK for mobile in-app subscriptions integration to iOS, Android, React Native, Flutter, Unity, or web app. Free up to $10k monthly revenue.
   * [CurrencyFreaks](https://currencyfreaks.com/) — Provides current and historical currency exchange rates. Free DEVELOPER plan available with 1000 requests/month.
   * [CurrencyApi](https://currencyapi.net/) — Live Currency Rates for Physical and Crypto currencies, delivered in JSON and XML. Free tier offers 1,250 API requests/month.
   * [currencylayer](https://currencylayer.com/) — Reliable Exchange Rates and Currency Conversion for your Business, 1,000 API requests/month free