It did not specify why it can no longer use the cryptocurrency firm's payments service.
WikiLeaks tweets that it would "call for a global blockade of Coinbase" because it is "an unfit member of the crypto community."
WikiLeaks says Coinbase has suspended it from using the cryptocurrency firm's payments service.
Coinbase offers a feature that lets online shops accept cryptocurrencies as payments. WikiLeaks, which publishes confidential documents, also sells items such as T-shirts and posters, allowing people to pay in bitcoin.
WikiLeaks posted a tweet over the weekend showing a message it had received from Coinbase. The cryptocurrency firm said WikiLeaks was "in violation" of its terms of service, but did not specify why.
Coinbase was not immediately available for comment when contacted by CNBC on Monday.