BEIJING--China unveiled detailed rules Wednesday that allow domestic and foreign companies to set up bank card-clearing operations, a sector long dominated by the state.

The announcement of the rules follows a decision in October by the State Council, China's top government body, that Beijing would ease its grip on bank and credit card clearing as part of an effort to open up the nation's financial sector.

The move is expected to offer foreign companies such as Visa Inc. (V) and MasterCard Inc. (MA) a chance to expand their presence in China.

Currently, state-run China UnionPay Co. has a near monopoly on processing and clearing yuan-denominated payments made through bank cards and credit cards.

Major international credit cards are widely accepted in China but foreign card companies can only process transactions made on cards issued by foreign banks. Chinese banks aren't able to issue cards in cooperation with U.S. card processors unless they also carry the China UnionPay brand.

The new rules, released on the main government website, state that companies need approval from China's central bank and the banking regulator to conduct clearing operations, a process that involves settling payments between banks and vendors.

The rules, which take effect June 1, also require applicants to have at least 1 billion yuan ($161.2 million) in registered capital. Foreign institutions need to set up an arm in China and receive a license from Chinese regulators.

Write to Grace Zhu at grace.zhu@dowjones.com

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