Other than BitPay what is the top API service to accept BTC, LTC, XMR, and ETH payments? I want to completely integrate it in my website without the user ever leaving my website. Just need to generate an address and display the amount to the user. It must very reliable and fast.
I currently use Plisio.net but sometimes it just takes too long to generate the addresses especially for XMR.
Can you tell us more about your website? What CMS do you use? I personally use WordPress + Woocommerce and I have installed the BTCPay Server woocommerce plugin on my website. I enjoy BTCPay Server, the plugin works amazingly well, it's open-source and most importantly I don't depend on payment gateways like Coinbase and Bitpay. I am my own bank on my website.
If you want to accept XMR too, BTCPay Server is the best choice. If you want a more user-oriented service, to automatically convert coins into cash and withdraw to your bank account, coinbase is a good option.