People’s Bank of China set the onshore yuan (CNY) reference rate for the trading session ahead.

USD/CNY is the onshore yuan. Its permitted to trade plus or minus 2% from this daily reference rate.
CNH is the offshore yuan. USD /CNH has no restrictions on its trading range.
A significantly stronger or weaker rate than expected is typically considered a signal from the PBOC.
The previous close was 7.2500

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PBoC injects 70bn yuan of 7-day reverse repos at an unchanged rate of 2.0%

10bn yuan of RRs mature today

thus a net 60bn yuan injection on the day