Betfair have offered their customers the facility to place Tote bets on the exchange since Feb 28th - and after little over a month, one has netted a whopping £510,955.60 after landing the Aintree jackpot today.
The Betfair punter only staked £32, and had two £1 lines running onto Boycuk and Oedipe in the final leg 4.55pm, which the latter won at 20/1.
Betfair spokesman Tony Calvin commented: "Since we launched the Tote facility on our site in February, we have been delighted with the take-up from our customers.
"And one in particular will be thrilled we have, especially as we don’t take any commission from Tote bets!."
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Update
The Betfair punter has been named as David Smith, 49, from Beckenham. He has been a Betfair user since 2002 and he said:
"This is actually the first time i have used the Tote facility on Betfair! I saw there was a jackpot rollover and how quick and easy it was to have the Tote bet on Betfair, with one click of a button.So i thought why not? "I'm going to be celebrating tonight, thats for sure."