Yes, DeployGate can be used from the Internet line in China.
Since DeployGate is a service for application developers worldwide, Chinese developers can also use it.
Also, international payment cards (VISA / Mastercard, etc.) can be used for payment. (UnionPay is not supported)
However, please use English or Japanese for interfaces, documents, and references for developers.
For tester/distribution target
With its gateway and distribution packaging system, DeployGate can deliver applications to restricted networks in China and Android terminals that do not have Google Play. The explanation to the tester/distribution target is in Simplified Chinese, English, and Japanese.
Android - Can be delivered to China's domestic network or non-Google Play terminals. (With some function limitation). Please follow the instructions in the link.
iOS - Please use it in the same way as in Japan.