Fund Gas Tanks

Overview

Gas tanks are enterprise-level fee wallets that BitGo uses to pay blockchain transaction fees (gas) on your behalf for EVM-based assets. When you send an ERC-20 token, for example, the gas fee is paid in the chain's native asset (ETH for Ethereum, MATIC for Polygon, etc.). Your gas tank holds that native asset.

Asset Gas Tank Requirements

General rule: Any asset on an EVM-based chain requires a gas tank. This includes both the chain's native asset (ETH, MATIC, BNB, etc.) and any tokens on that chain (ERC-20, ERC-721, etc.). Non-EVM chains handle fees differently and do not use gas tanks. Check the Gas Tank on the BitGo app for more information.

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Note

If you're only working with Bitcoin or other non-EVM assets during development, you can skip this page and come back when needed.

1. Get Testnet Native Coins

Before you can fund a gas tank, you need native testnet coins. See the faucet table on the Environments page to obtain them.

For Ethereum (Holesky testnet), get htETH from the Google Cloud Holesky faucet.

2. Find Your Gas Tank Address

Funding your gas tank requires using the BitGo web application:

1. Log in to https://app.bitgo-test.com.
2. Click the Gas Tanks icon in the top navigation bar, next to the Activity bell.
3. Find the gas tank for the chain you need (e.g., hteth for Holesky Ethereum).
4. Click Deposit.
5. Copy the deposit address or scan the QR code.

3. Send Testnet Coins to the Gas Tank

Send native testnet coins from the faucet (or from another wallet you control) to the gas tank address you copied in Step 2.

4. Verify Your Gas Tank Balance

Confirm your gas tank is funded by calling the fee address balance endpoint:

Endpoint: Get Gas Tank Balance

export ENTERPRISE_ID="<your-enterprise-id>"
export BITGO_ACCESS_TOKEN="v2x..."

curl "https://app.bitgo-test.com/api/v2/hteth/enterprise/$ENTERPRISE_ID/feeAddressBalance" \
  -H "Authorization: Bearer $BITGO_ACCESS_TOKEN"

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Note

You can find your Enterprise ID in the BitGo web app under Settings > Enterprise Settings, or from the response of GET /api/v2/user/{id} in the enterprises array.

Funding Amount

For testnet development, a small amount is sufficient — 0.1 htETH is plenty for hundreds of test transactions. In production, monitor your gas tank balance and set up a webhook to alert you when the balance drops below a threshold.

Next Steps

Go to Install SDK or Install Express to set up your development environment.

See Also

API Reference: Get Gas Tank Balance