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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.

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Enabling Gas Top-Up

To enable gas top-up in your quote request:
  • Set topupGas to true
  • Optionally specify the gas amount using topupGasAmount

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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.