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ShapeShift keeps the same rate, but as I read transactions just disappear and people loose money. I’ll appreciate any help, thank you in advance.
Have you used changelly? I know they are red trusted in this forum but I have used them several times without any hassle. They try to adjust the rates in such an dynamic market such that the maximum amount is exchanged at the best rate. I dont know or have any idea about their algorithm of doing so but I was happy to get near coinmarketcap rates.
If you are looking to arbitrage your coins they might not be good options. You would be better off going to a proper exchange and selling your coin there.
Talking about shapeshift, they have the "precise" and "quick" options where you can adjust it for either long waiting time+precise exchange or a short waiting time+not-so-precise exchange. Still shapeshift was good till one day they started the KYC/AML guidelines.