Indexed by TopGit from live GitHub metadata: base/withdrawer has 537 stars, written primarily in Go. Golang utility for proving and finalizing withdrawals from op-stack chains.
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Golang utility for proving and finalizing ETH withdrawals from op-stack chains.
Installation
git clone https://github.com/base/withdrawer.git
cd withdrawer
go install .
Usage
[!CAUTION]
Do not send ERC-20 or other tokens to the L2StandardBridge, only native ETH is supported.
Without Fault Proofs
Step 1
Initiate a withdrawal on L2 by sending ETH to the L2StandardBridge contract at 0x4200000000000000000000000000000000000010, and note the tx hash.
Example on Base Sepolia: 0x5e47346867cf87d8e8c82cae1d30a94b8d5587dc9d354aef5c5a7b4c84ad9463.
[!NOTE]
Users are required to wait for a period of seven days when moving assets out of Base mainnet into the Ethereum mainnet. This period of time is called the Challenge Period and serves to help secure the assets stored on Base mainnet.
Completed withdrawal for 0xc4055dcb2e4647c37166caba8c7392625c2b62f9117a8bc4d96270da24b38f13: 0x1c457f1992f48f1f959ceaee5b3c7e699a26f6f05d93997d49dafe703fd66dea
waiting for tx confirmation
0x1c457f1992f48f1f959ceaee5b3c7e699a26f6f05d93997d49dafe703fd66dea confirmed
Note: this can be called from any L1 address, it does not have to be the same address that initiated the withdrawal on the L2.
With Fault Proofs
[!NOTE]
With the recent fault proofs upgrade for Base on Sepolia testnet, withdrawals are required to wait for a period of seven days. This mirrors the Challenge Period that exists for Base mainnet. Additionally, withdrawals are required to be finalized against dispute games that resolve in favor of the output root claim. If the dispute game is blacklisted, resolves against the output root claim (challenger wins), or the respected game type is changed, then the withdrawal will need to be re-proven.
Step 1
Initiate a withdrawal on L2 by sending ETH to the L2StandardBridge contract at 0x4200000000000000000000000000000000000010, and note the tx hash.
Example on Base Sepolia: 0x5e47346867cf87d8e8c82cae1d30a94b8d5587dc9d354aef5c5a7b4c84ad9463.
Proved withdrawal for 0xc4055dcb2e4647c37166caba8c7392625c2b62f9117a8bc4d96270da24b38f13: 0x6b6d1cc45b6601a30646847f638847feb629221ee71bbe6a3de7e6d0fbfe8fad
waiting for tx confirmation
0x6b6d1cc45b6601a30646847f638847feb629221ee71bbe6a3de7e6d0fbfe8fad confirmed
Note: this can be called from any L1 address, it does not have to be the same address that initiated the withdrawal on the L2.
Step 3
[!IMPORTANT]
Unlike the non fault proof withdrawal flow, you MUST use the same address that proved the withdrawal to finalize the withdrawal.
After the dispute game has resolved in favor of the root claim AND the finalization period has elapsed, finalize your withdrawal (same command as above):
Completed withdrawal for 0xc4055dcb2e4647c37166caba8c7392625c2b62f9117a8bc4d96270da24b38f13: 0x1c457f1992f48f1f959ceaee5b3c7e699a26f6f05d93997d49dafe703fd66dea
waiting for tx confirmation
0x1c457f1992f48f1f959ceaee5b3c7e699a26f6f05d93997d49dafe703fd66dea confirmed
Flags
Usage of withdrawer:
-rpc string
Ethereum L1 RPC url
-network string
op-stack network to withdraw.go from (one of: base-mainnet, base-sepolia, op-mainnet, op-sepolia) (default "base-mainnet")
-withdrawal string
TX hash of the L2 withdrawal transaction
-fault-proofs
Use fault proofs withdrawal flow (only for networks that support fault proofs)
-private-key string
Private key to use for signing transactions
-mnemonic string
Mnemonic to use for signing transactions
-ledger
Use ledger device for signing transactions
-hd-path string
Hierarchical deterministic derivation path for mnemonic or ledger (default "m/44'/60'/0'/0/0")
-l2-rpc string
Custom network L2 RPC url
-l2oo-address string
Custom network L2OutputOracle address
-portal-address string
Custom network OptimismPortal address
-dgf-address string
Custom network DisputeGameFactory address (only for networks that support fault proofs)
-asr-address string
Custom network AnchorStateRegistry address (only for networks that support fault proofs)
-gas-limit uint
Gas limit for transactions (overrides automatic estimation)
-gas-price string
Gas price in wei for legacy transactions
-max-fee-per-gas string
Maximum fee per gas in wei for EIP-1559 transactions
-max-priority-fee string
Maximum priority fee per gas in wei for EIP-1559 transactions
-gas-multiplier float
Multiplier for estimated gas limit (default 1.0)
-max-gas-price string
Maximum gas price cap in wei (safety limit to prevent unexpectedly high costs)
Gas Configuration Notes
If no gas flags are provided, the RPC suggested gas price will be logged before submitting transactions
Use --gas-price for legacy transactions OR --max-fee-per-gas and --max-priority-fee for EIP-1559 transactions (not both)
The --gas-multiplier flag multiplies the estimated gas by the specified factor (e.g., 1.1 for 10% buffer)
The --max-gas-price flag acts as a safety cap and will abort the transaction if the gas price exceeds this value
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What language is base/withdrawer written in?
base/withdrawer is written primarily in Go. GitHub's language field is based on the largest share of bytes in the default branch.
What license does base/withdrawer use?
base/withdrawer is released under the MIT license. Always verify the LICENSE file directly on GitHub for the authoritative terms — license strings can be edited out of sync with a project's actual stance.
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