"With the RBNZ set to become one of the first central banks in advanced economies to hike rates, we think that the New Zealand dollar will continue to strengthen."
China's major state-owned banks were seen buying US dollars at around 6.4 yuan in the Asian afternoon in a move viewed as an effort to cool the rally in the onshore yuan, sources said.
The offshore yuan also followed its onshore counterpart's appreciation in morning trade to test the key 6.4 per dollar level. It jumped to a high of 6.4010 before trading at 6.406 per dollar as of midday.
Ahead on Tuesday is a German business survey, a series of US housing updates and a handful of policymaker speeches in Europe, Britain and the United States, which will all be parsed for a reading on inflation.
In the spot market, onshore yuan opened at 6.4380 per dollar and was changing hands at 6.4330 at midday, 15 pips firmer than the previous late session close.
Okg Technology Holdings Ltd, an affiliate of crypto exchange OK Coin, fell 4.26% and Huobi Tech, an affiliate of crypto exchange operator Huobi, lost 1.23% .
Cryptocurrencies were volatile after suffering one of their biggest losses on Wednesday in the wake of China's decision to ban financial and payment institutions from providing digital currency services.
Elsewhere, the Australian and New Zealand dollars eased slightly as the Antipodeans struggled to break through heavy technical resistance, but sentiment remains positive due to rising commodity prices, some traders said.
Analysts and traders also say that relatively tight cash conditions ahead of monthly tax payments due this week continue to provide some support for China's currency.
The volume-weighted average rate of the benchmark overnight repo traded in the interbank market, rose to 2.13% in morning trade, the highest level since April 30.