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 or USDT. You send that same asset. The fee comes out of the same balance 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.

Fee paid in the asset you hold. That's the whole idea.

With Sigma9, gasless means the fee is paid in the same asset you're sending — USDC when you send USDC, USDT when you send USDT. Never "hold USDC to send USDT," and never a separate gas token. 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 stablecoins

Gasless USDC (fee paid in USDC) on every network Sigma9 supports for USDC:

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

Gasless USDT (fee paid in USDT itself) on Arbitrum, Polygon, Ethereum, MegaETH and Solana. Not on Unichain or Optimism. Base has no USDT.

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

Move your money between networks — where a real route exists

USDC can move across the USDC-bearing chains above via Circle CCTP v2 — fee still paid in USDC. For USDT, cross-chain is partial: the only live USDT0 bridge route today is Arbitrum → MegaETH (MegaETH is destination-only). Elsewhere, same-chain send is the baseline.

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 the same asset you're sending — USDC when you send USDC, USDT when you send USDT — on every network Sigma9 supports for that token.

What happens if I run out of gas?

It can't happen. The fee comes from the same token balance you're sending from — there's no separate gas-token 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?

Gasless USDC on Ethereum, Base, Arbitrum, Optimism, Polygon, Unichain, Monad, World Chain, and Solana. Gasless USDT on Arbitrum, Polygon, Ethereum, MegaETH, and Solana. The only live USDT0 bridge route is Arbitrum → MegaETH.

Is it really free of gas tokens on every network?

Yes. Every send, and every supported move between networks, is paid in the same asset you hold for that transfer — USDC or USDT — never a separate gas token.

See more frequently asked questions →

Sigma9 — gasless self-custody. Network fees paid in the asset you hold (USDC or USDT). Keys stay on your device.