"The great majority of USAID's activities will end in March 2014. The process of reducing personnel has already begun. The office will close next year," the official said, speaking on condition of anonymity.
It came a day after Ecuador announced it was freezing cooperation with USAID, saying the agency cannot "carry out any new activity, nor extend timeframes for completion of projects" until a new framework agreement has been signed.
"We would sign with USAID if that financing was for development, but the money is used to finance NGOs that are enemies of the government," Alexis Mera, an aide to leftist President Rafael Correa.
"We aren't USAID beggars nor are we a colony of the United States," he said on GamaTV.
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Correa last year accused the agency of financing opposition groups and threatened to expel it from the country.
His leftist government has limited the work of international NGOs, citing concerns they might destabilise this OPEC member state.