The likes of Emeli Sandé, Dizzee Rascal and Two Door Cinema Club's Alex Trimble were paid a token fee of £1 to create a contract.
Even established acts such as Arctic Monkeys and Sir Paul McCartney agreed to play at the event for free.
Sandé, who performed 'Abide With Me', told the Evening Standard: "I got paid £1 for my work. It's there in print and I know because I signed the contract myself. Mind you, I haven't received anything yet!
"When I do, though, that £1 will be truly special. Part of what made the whole event so special was the volunteers who were paid nothing and even paid for their own accommodation. It shows how important art is."
Dizzee Rascal added: "I feel honoured and humbled to have been asked to be involved. The energy in the stadium was unreal. These opportunities only come by once in a lifetime and to be part of it was an unforgettable experience."
Locog said that while well-known artists played for £1, professional dancers and actors were paid the going rate. Volunteers did not receive a fee.
The artists who appeared at the ceremony have since experienced a boost in sales, with the Isles of Wonder compilation currently sitting at number one on the iTunes UK album chart.
The ceremony was watched by around 27 million people in the UK alone.
Photo gallery - the London 2012 Opening Ceremony:
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