yes and no.
the smaller sting rays can be kept at home. However these are extremely difficult to keep. If you are interested look this website... www.monsterfishkeepers.com they are all people who keep these fish. The extremes.
If you want sting rays i believe the minimum is a few hundred gallons. they require extremely clean conditions, special feeding requirements. IT will cost hundreds for the equipment, weeks of preperations, and a lot of maintenance. not for the faint of heart.
But if you are honestly into keeping such things do the research. and good luck!