* https://www.braintreepayments.com/ - Credit Card, Paypal, Venmo, Bitcoin, Apple Pay,... integration. Single and Recurrent Payments. First $50 are free of charge
* https://www.braintreepayments.com/ - Credit Card, Paypal, Venmo, Bitcoin, Apple Pay,... integration. Single and Recurrent Payments. First $50k are free of charge
* http://taxratesapi.avalara.com/ - Get the right sales tax rates to charge for the close to 10,000 sales tax jurisdictions in the USA. Free REST API. Registration required
* https://currencylayer.com/ - Reliable Exchange Rates & Currency Conversion for your Business, 1,000 API requests/month free
* https://vatlayer.com/ - Instant VAT Number Validation & EU VAT Rates API, free 100 API requests/month