As mentioned above:
"NEW YORK, NY / ACCESSWIRE / March 20, 2018 / Opporty, a business-oriented, blockchain-powered startup from Delaware, is pleased to announce that the first crypto-based transactions via its innovative smart widgets have been made. The widgets are implemented at third-party websites, with no development activities required on the part of website owners. They enable on and off platform payments using BTC and ETH for offerings listed at the Opporty marketplace."
I think this is a good start for this project with some useful example that can convinced more investors, I do not know much technical details, but I am curious if there is any difficulty to reach that goal? I think we have different ways to pay btc and eth.