In most of the lotteries in the United States and the world, you do not win any prize for getting only 1 number right. However, in Powerball drawings you win $4 for getting only the Powerball right. For 1 number plus the Powerball, you win $4 as well.
In Mega Millions drawings, you win $2 for getting only the Mega Ball right. If you have 1 number plus the Mega Ball, you win $3. State lotteries rarely pay any money for only 1 correct number being chosen, even in 3 and 4 digit drawings.
Right now, no state lotteries paying for 1 number could be found in the USA, but it's possible it may occur in the future. This does not apply to scratch-off lottery tickets or any lotteries not sanctioned by state governments or the federal government.