That's quite an interesting service. I hadn't seen this site before. That is a very extensive list of currencies there. Fees seem reasonable too.
I was also suitably impressed by the service.
Would it be fair to question if this encourages the use of crypto currencies as a proxy currency? I cannot tell if this is a good thing encouraging adoption and accessibility, or something which encourages the notion of alternative currencies having no long term value. Specifically the part about merchants immediately exchanging to btc, and then potentially fiat.
I use coinpayments with WordPress. The way I handle my marketplaces and auctions is to custom code the currency to display as a crypto (e.g., DRK) and then pay my sellers in that currency. If they want to trade for BTC or fiat it is up to them, but the stores pay out in crypto only. My intention is to encourage the use of crypto as a primary currency. If you want to see what I'm talking about check out Darkbids.com or Earthazaar.com.