Gas Top-Up - Relay

Gas Top-Up

Gas top-up automatically includes a small amount of the destination chain’s native gas token (e.g., ETH) with the bridged tokens. This ensures recipients have gas to interact with their received tokens immediately.

Enabling Gas Top-Up

To enable gas top-up in your quote request:

• Set topupGas to true
• Optionally specify the gas amount using topupGasAmount

Checking Gas Top-Up Support

A chain supports gas top-up when all of the following are true:

1. EVM chain only - The chain’s vmType must be `"evm"
2. Non-native currency - You cannot top up gas when bridging the chain’s native token (e.g., ETH on Ethereum)
3. Bridging enabled - Either:
   • tokenSupport is "All", OR
   • currency.supportsBridging is true

You can verify support by checking the Gas Top Up Supported column in Supported Tokens & Routes or by querying the Chains API.