Never buy a gas token again

You've been there. Money sitting right in your wallet — and you can't send it. Not because you're short on cash, but because you're short on some completely different coin. One you never wanted, whose only job is to pay a fee.

Sigma9 ends that. You hold USDC. You send USDC. The fee comes out of the same USDC you already have. There's nothing else to buy, top up, or run out of. Ever.

The gas token trap

Every other wallet does this to you:

• You want to send money you already have — but first you have to go buy a "fuel" coin on an exchange.
• Your transfer gets stuck. Not because your balance is too low, but because a tiny second balance ran dry.
• You end up juggling two coins: the money you actually care about, and a coin you only hold to keep the first one moving.

None of that is necessary. It's just how most wallets happen to work.

One balance. That's the whole idea.

With Sigma9, there's only one coin: USDC. Sending it costs USDC. Nothing else. There's no fuel gauge to watch, no second balance to remember, no moment where a payment gets blocked because you forgot to top something up.

Works wherever you keep your USDC

Sigma9 works the same gasless way on every network it supports:

• Ethereum
• Base
• Arbitrum
• Optimism
• Polygon
• Unichain
• Monad
• Solana

Using Monad? See how it works there →
On Solana? See how it works there →

Move your money between networks just as easily

Your USDC doesn't have to stay put. Move it from one network to another whenever you need to — the fee is still paid in USDC, and there's still nothing else to buy first.

It's yours

Sigma9 is self-custody. Your keys stay on your device — not on a server, not with us. Only you can move your money. No account, no sign-up, nothing to leak.

Frequently asked questions

Do I need ETH or SOL to send money?

No. The fee is paid in USDC, on every network Sigma9 supports.

What happens if I run out of gas?

It can't happen. The fee comes from the same USDC balance you're sending from — there's no separate balance to run out of.

Is there a sign-up or account?

No. Sigma9 is self-custody — it's yours. Your keys stay on your device, and nothing is stored on a server.

Which networks can I use?

Ethereum, Base, Arbitrum, Optimism, Polygon, Unichain, Monad, and Solana.

Is it really free of gas tokens on every network?

Yes. Every send, and every move between networks, is paid in USDC — never a separate gas token.

Sigma9 — gasless USDC only. Keys stay on your device.