Toussaint scored 58.3 points at the event to see her finish atop the standings ahead of Australia's Emma McKeon and Yuliya Efimova of Russia with 55.9 and 55.3 points, respectively.

Seto's 58.2 points secured the gold medal while Dutchman Arno Kamminga narrowly beat South Africa's Matthew Sates to second place.

Kamminga ended on 55.9 points to Sates' 55.7.

The Japanese swimmer won the men's 200 metres breaststroke and 400m medley on the final day to cap off a fantastic weekend.

Toussaint, meanwhile, won her third straight title in the women's 200m backstroke after beating Sweden's Michelle Coleman and Zsuzsanna Jakabos of Hungary.

She won by a length in a time of 2min 2.12sec with Coleman coming in 04.31sec later.

The two champions were both awarded $12,000 (£8,720/€10,303) in prize money.

Runners-up were given $10,000 (£7,267/€8,586) and third-placed athletes received $8,000 (£5,813/€6,868).

Sates' finish sees him remain in pole position for the overall World Cup over three legs.

His compatriot, Pieter Coetze, capped off a remarkable weekend with a victory in 50.86 in the men's 100m backstroke.

The 17-year-old won all three backstroke events at the competition.

Two-time Olympic silver medallist Efimova dominated the women's breaststroke events as she took her third win in the 50m, touching the wall in 30.11 to beat Belgian Fanny Lecluyse's time of 30.48.

South Korean Back Su-yeon made up the podium as she finished in 31.01.

The World Cup series is scheduled to reach its climax next week in Kazan in Russia from October 28 to 30.