That's up from the previous peak of 177 per second around the same time last year, Paymark said.
While Christmas Eve is normally the busiest spending day of the year, it is usually trumped by the weekend if it falls on a Monday.
Kiwis spent the most last Thursday (December 20), when they dished out $296 million during the day.
"Over the weekend, gift buying continued aplenty but food and liquor spending took on a greater prominence," Paymark said.
"Spending on food and liquor was up 32 per cent on the prior weekend as we stock up for Christmas and hopefully some time off before New Year. Kiwis spent a total of $130.5m on the food and liquor category this weekend, with more to come today," the firm said.
Overall spending was up by the most over the weekend in Palmerston North, where Kiwis splurged $12.8m (up 8.6 per cent on last year).
Spending was also well up in Otago, Wellington and Canterbury.
Spending in Auckland & Northland over the weekend was up 2.9 per cent on the same two days in 2017.
Spending fell in Gisborne, South Canterbury, West Coast and Wairarapa.