Now that XMR has RingCT implemented its the only fully anon crypto in the market (Thats trustless and not owned by a US corporation..cough cough ZCASH).... You can pay any BTC address with xmr using www.XMR.TO I have personally used it for a few small digital items on AB to test the implementation... No longer worry about anon btc or some mixer running away with ur BTC
xmr.to will work.