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Our team is working hard to solve ASAP the legal implications of accepting Steem and Steem Dollars using our official account @steemhost . Being a legal business operating in US and UK (we are ICANN-accredited registrar) we must respect the law. You can pay now only using our accepted methods that you will find at checkout! We hope that will be solved soon and you will be able to use your crypto to pay for services!

Namecheap.com allows you to pay in BitCoin (and you can easily convert your Steem/SD to BTC)

But people will love to have the "Pay with Steem" button on our website! Or the "Pay with SBD" button! Right?

Yes I imagine they would. Not just pointing out that it is "Legal" to accept Crypto Payments in the USA and UK (two biggest territories for namecheap.com). It is just a matter of coding in a system to provide Memo Key when user clicks the Pay with Steem button and then monitoring your @steemhost account for the payment to be received on Steemit.com