The site has attracted more than 41,000 user registrations and 238,000 individual bets.
The figures were released in financial results for the six months to 30 June from Arena Leisure, a joint investor in the attheraces betting and racing venture alongside Channel 4 and BSkyB.
The group revealed that its share of start-up costs for attheraces during the half-year period had reached £5.7m, in line with expectations.
Arena Leisure said it remained confident about the future of the venture, despite delays in the launch of an interactive TV betting service on Sky digital.
A spokesman for the company explained that delays for the iTV service had been caused by tests for the service, which will send betting data via the digital broadcast signal, rather than Sky's traditional telephone-based interactive service.
"It's the next generation of interactive betting," added the spokesman. "It's a first for Sky as well.
It takes time because there are 20 to 25 different versions of Sky set-top boxes. It makes sense to test that the service works on all of them."
Arena Leisure also revealed that the attheraces digital TV racing channel, launched on Sky in May, gained peak weekly audiences of 774,000 viewers in July, an increase of 10 per cent on June.
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