More than thirty assets work here and the list can be intimidating. For almost everyone the honest answer is: whichever one you already hold. If you are buying specifically to pay for this, read on.
The short recommendation
USDT on Tron. It is worth a dollar, so the amount you send matches the price of the plan with nothing to convert in your head. It confirms in seconds. The network fee is a fraction of a cent. Every exchange supports it.
USDC behaves identically if you prefer it. There is no meaningful difference for a purchase this size.
If you already hold something else
Then use that. Bitcoin, Ethereum, Litecoin, Solana, Dogecoin and about forty others all work, and converting what you have into something else on an exchange first will usually cost you more in spread and fees than paying directly.
The one thing worth checking is the withdrawal fee your exchange charges for that specific asset. They vary wildly and do not always reflect the real network cost. Bitcoin withdrawals in particular are often priced far above what the transaction actually costs.
Why some coins are greyed out
Every swap has a minimum, set by whoever is providing the liquidity, and those minimums move during the day. If a coin's current minimum is above your order total, we grey it out rather than letting you pay and fail. On the cheapest single month plans a few assets fall out this way. Picking a longer term brings them back.
What does not matter
Which coin you pick makes no difference to what you receive or how fast we send it. It all converts to the same thing on our side before it reaches us. There is no coin that gets you a discount and none that gets you faster delivery, and anyone telling you otherwise is selling something.
If you are unsure
Start with a single month. It is the cheapest way to see the whole process work end to end, and the plan can be extended later.