Of course, nothing is impossible - I know a site where there are many tipsters who have over 70%, even 80% wins, but mostly the odds are around 1.5. You won't find what you're looking for (fixed matches) so easily, because if such matches exist (and they do exist), big money is made there, and no one shares them online or sells them for a few hundred dollars.

From my experience with such things, no one will let you verify such things for free, you always have to pay in advance, and in case the bet is successful, they usually ask you to pay another part of the won prize.