The plaintiffs claim Sirin Labs, Stox and Leadcoin didn't fulfill product promises to investors.
A Washington state-based judge threw out the lawsuit after the plaintiff failed to make a case.
Israeli blockchain prediction market Stox and its founder Moshe Hogeg are reportedly being sued for $4.6 million over alleged fraud.
The token sale for a blockchain-based prediction market promoted earlier this month by boxing champion Floyd Mayweather, Jr., has raised $30 million.