The police arrested the woman on Thursday after investigating the platform, which is based in Vietnam.

She promoted the scheme and recruited others to join. Users had to download the Fun Coffee app and transfer cryptocurrency into digital wallets.

The app offered investment plans with high returns and commissions for recruiting others. The plans seemed too good to be true.

People in Singapore who invested in the scheme could not withdraw their money from the app.

Earlier this week, police in Hong Kong and Macau arrested eight people linked to Fun Coffee after receiving over 220 complaints.

The victims lost almost US$12.7 million to Fun Coffee. The app suddenly went offline on July 20, prompting complaints.

Fun Coffee describes itself as a lifestyle brand that combines coffee, wellness, and digital innovation.

The company says its platform rewards users for participating and interacting with the community.

Fun Coffee aims to create a platform where coffee, lifestyle, and community participation support its global growth.

The company operated a cafe with a coffee-making robot in Singapore.

The arrested woman is being investigated for breaking laws against multi-level marketing and pyramid selling.

If convicted, she could face up to five years in jail, a fine of up to US$156,000, or both.

The police warn the public not to make any more payments to the scheme, even if asked by someone claiming to represent Fun Coffee.