The Sydney biohacker who fell foul of the law when he implanted a NSW travel card chip into his arm says "cyborg justice has been served" after a court overturned his conviction.

Meow-Ludo Disco Gamma Meow-Meow - his legal name - pleaded guilty to attempting to travel without a ticket and not showing a ticket for inspection in August 2017.

Meow-Ludo Disco Gamma Meow-Meow outside court on Monday. Credit:AAP

But Meow-Meow, who had implanted an Opal chip in his hand in a surgical procedure, had tapped on according to the ticket inspector's Opal reader.

He was fined $220 and ordered to pay $1000 in legal costs at Newtown Local Court in March.