Melbourne-based bitcoin exchange Coinjar is hoping to nudge the digital currency into the mainstream next month with the offer of the first eftpos card in Australia linked to a bitcoin account.

Coinjar co-founder Asher Tan said many of its customers had bought bitcoin as an investment and there was a growing number of companies that accepted it, but they were keen to use it for everyday transactions.

A trial of the first eftpos cards linked to bitcoin accounts will be done with about 100 people over the next couple of weeks, and then they will be made available generally.

"Many people who have bought Bitcoin ask 'where do I spend it?'," he said. "This means anywhere that accepts eftpos accepts bitcoin now."

A trial of the cards will be done with about 100 people who already have bitcoin accounts over the next couple of weeks, and then they will be made available generally.