Gas Tokens
Pay network fees in the coin you actually hold
Every transaction in Hinkal (Send, Swap, Shield, Unshield, or dApp interaction) is executed through a relayer that fronts the on-chain gas fee. The relayer:
submits your transaction
covers the blockchain fee upfront
You don’t need to keep a specific token just to pay for fees.
Choosing a gas token
Before confirming a transaction:
Tap Gas token
Select the token you want to use
The fee updates instantly
You’ll always see:
exact amount
in the selected token
How gas works
Gas depends on:
the network
the type of transaction
EVM chains (Ethereum, Arbitrum, Base, Optimism)
You can choose to pay fees in:
ETH
USDC
USDT
DAI
The relayer handles the rest.
Polygon
Same as EVM, but:
ETH is replaced with MATIC
So you can choose:
MATIC
USDC
USDT
DAI
Solana
Public account
Fees are paid in SOL
Private account
Fees depend on the transaction:
Sending → you pay in the token you are sending
Swapping → you pay in the token you receive
Example:
Swap SOL → ETH → fee is paid in ETH
Key idea
You don’t need to manage separate gas tokens
You always see the fee before confirming
The system handles everything in one step
How it works under the hood
You choose a gas token on the transaction screen
The relayer broadcasts your signeexecutes the transaction and covers the network fee
The exact cost is deducted from your wallet in the token you selected
Everything happens in a single step - no separate payment required.
You choose a gas token on the transaction screen.
The relayer broadcasts your signed transaction and pays the gas in ETH.
Once the transaction is processed, the relayer charges the dollar-value cost from your wallet in the token you selected.
Because the settlement happens atomically with the call, you never owe the relayer a balance later, and you never have to keep ETH on hand
Using the gas-token selector
Tap the Gas token dropdown
Select a token (ETH / MATIC / USDC / USDT / DAI, depending on network)
Your balance is shown so you know what you can use
The fee updates instantly, so you always see:
exact amount
in the selected token
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