Infinitecoin is accepted via CoinPayments!
https://coinpayments.net/index.php?cmd=supported_coins

What is CoinPayments.net?
We provide an easy to integrate checkout system for cryptocurrencies such as Bitcoin and Litecoin and Infinitecoin with low fees. The API is designed to be simple and provides a polled interface or Instant Payment Notification (IPN). If you have ever programmed for PayPal(tm)'s IPN system it is just as simple.

https://coinpayments.net/