The black box around Xi Jinping’s corruption crackdown has long fueled political gossip in China. Now, an underground market is emerging for selling purported secrets on who might be next to fall.

Across China’s tightly controlled internet, authorities are playing whack-a-mole to stop shadowy users who peddle access to groups claiming to leak details of which officials are under scrutiny, according to a recent report from Banyuetan, a magazine published by the official Xinhua News Agency.

Members are typically charged a small entry fee, with access to more exclusive chat rooms promising better tips fetching as much as 399 yuan ($59), the report said. Clues are often cryptic: A cadre’s resume is posted without explanation, or an official’s name appears disguised by homophones. To evade monitoring, operators constantly shuffle members into new rooms.