The Group leases office spaces under non-cancelable operating lease agreements, which expire in 2025 and the future lease payment under operating leases as of June 30, 2025 was as follows:

 Schedule of future lease payments under operating leases

Operating lease costs for the three and nine months ended June 30, 2025, were US$Nil (2024: US$Nil), which excluded cost of short-term contracts. Rental expenses related to a short-term lease contract for the three and nine months ended June 30, 2025 were US$ 16,624 (2024: US$16,685) and US$ 49,843 (2024: US$ 44,823), respectively.