Betfair is calling for harness racing exchanges to be staged on four Sundays in 2009 with no televised racing fixtures following the success of the first harness race at Kempton on 16 July.
Punters placed more than £80,000 on the race with the online betting site, according to a story by Amy Mathieson in the Horse & Hound UK.
"Two thousand racegoers watched the race at Kempton Park and the race was aired live on Racing UK," the story said.
"Tony Calvin from Betfair told H&H: "Our expectations were minimal - but as it turned out more than 1,000 people placed bets on the harness race."
"We were completely taken unawares. There is definitely potential if it is supported by one of the horseracing channels. It could provide a new interest for the racing fraternity and certainly gets our backing."