Miniclip, a Flash-based online game site, has partnered with online payment firm Social Gold to accept player payments from directly within its browser-based games.

The site hosts some 550 games, and says it receives 57 million unique users per month. It did not indicate how many of its games will feature paid content.

Social Gold, operated by San Francisco-based Jambool, provides an API available to all developers of online games, allowing developers to incorporate their own "white-label" currency based around the Social Gold framework.

"By incorporating Social Gold, Miniclip will continue to provide an immersive, premium entertainment experience for our global community," said Miniclip COO Jeremy Wadia in a statement today.

"Social Gold’s in-Flash solution removes all friction from the payments experience, allowing our players to make in-game purchases without ever leaving the game," he added. "This not only drives free to paid conversion, but also turns one-time purchasers into repeat purchasers."