WikiLeaks founder Julian Assange blasted the mainstream media, Washington, banks and the internet itself as he addressed journalists in Hong Kong on Monday via videolink from house arrest in England.

Fresh from accepting a top award for journalism from the prestigious Walkley Foundation in his native Australia on Sunday, Assange spoke to the News World Summit in Hong Kong before keeping a regular appointment with the police.

He defended his right to call himself a journalist and said WikiLeaks' next "battle" would be to ensure that the Internet does not turn into a vast surveillance tool for governments and corporations.

"Of course I'm a goddamn journalist," he responded with affected frustration when a moderator of the conference asked if he was a member of the profession.

He said his written record spoke for itself and argued that the only reason people kept asking him if he was a journalist was because the United States' government wanted to silence him.

"The United States government does not want legal protection for us," he said, referring to a US Justice Department investigation into his whistle-blower website for releasing secret diplomatic and military documents.

The former hacker criticised journalists and the mainstream media for becoming too cosy with the powerful and secretive organisations they were supposed to be holding to account. In a 40-minute address, he also accused credit card companies such as Visa and Mastercard of illegally cutting WikiLeaks off from funding under a secret deal with the White House.

Assange, 40, is under house arrest in England pending the outcome of a Swedish extradition request over claims of rape and sexual assault made by two women.