In a meeting with Israeli Prime Minister Binyamin Netanyahu, Musk said that the payment system is the only way to counter fake accounts.
"We are moving to charging a small monthly payment for the use of the system," the Tesla and SpaceX boss said.
However, the company did not respond to requests for details.
It is unclear whether this is just an off-the-cuff comment or a signal of tighter plans yet to be announced.
X PREMIUM INCENTIVE
Musk has long said that his solution to getting rid of bots and fake accounts on the social media platform was to charge for verification.
Since taking over Twitter last year, he has tried to encourage users to pay for an enhanced service, now called X Premium.
This was done by offering paid subscribers more features, such as longer posts and more visibility on the platform.
However, users can currently continue to use X for free.
While there is a clear financial interest in the company charging users, Musk insists that paying people for the service is aimed at fighting bots.
X Premium currently costs $8 per month in the US. The price varies depending on which country the subscriber is in.