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DeFi Checkup

Ethereum

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Immutable X: finalize a pending L1 withdrawal

A withdrawal prepared on Immutable X can remain in the Ethereum bridge until finalized on L1. This is separate from the automated migration to Immutable zkEVM. This limited check reads the standard address-derived Stark key for ETH, IMX and USDC, without asking for a connection or signature.

The official recovery manual, contracts and a public withdrawal simulation were checked on 2026-11-02. Explorer forms and connected confirmation screens still need browser review.

Who is eligible

The Ethereum bridge is 0x5FDCCA53617f4d2b9134B29090C87D01058e27e9. The official finalization manual applies to standard withdrawals initiated on or before 11 February 2026 that remain unfinalized. That cutoff is not a deadline for claiming.

For standard keys, the Stark key is the numeric value of the Ethereum address. The check confirms that getEthKey resolves to that same address, verifies each listed asset’s registration data, and reads getWithdrawalBalance. The current implementation returns actual token units, already converted from quantum units. Applying quantum a second time would overstate the amount.

Supported assets are native ETH, IMX at 0xf57e7e7c23978c3caec3c3548e3d615c346e79ff and USDC at 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48. Legacy Stark keys, other fungible assets, NFTs and balances that never became pending L1 withdrawals are outside this check.

Every positive result carries a coverage warning. If no supported balance can be confirmed, the check reports incomplete coverage, not that the whole Immutable X account is empty. A failed asset lookup or unresolved recipient also remains explicit. There is no historical log scan or proxy route.

How to get it out

  1. Open the official manual. Use its mainnet bridge explorer link. Compare the full bridge address with the one above.
  2. Read getEthKey for the Stark key and compare the entire recipient with your intended address. Registration can be permanent. Do not proceed if the recipient is unknown to you.
  3. Check the token’s asset ID in the official mainnet table and your finding. The documented function is withdraw(ownerKey, assetType) through the bridge proxy. Review the amount, asset ID, recipient and Ethereum fee in a trusted wallet on the external interface.
  4. The function may be called by anyone, but pays the registered recipient. Finalizing a withdrawal does not redirect funds to the caller. You do not need to initiate another withdrawal on L2.

If you used a legacy key, use existing public transaction details or official support to investigate. DeFi Checkup does not recreate keys or request signatures. The official manual describes a separate, unaudited local registration tool for some legacy cases. That process is outside this scanner’s coverage, can be expensive, and should never be run through a recovery link sent by a stranger.

What it costs

The scanner estimates 150,000 gas per standard-key withdrawal, not a measured cost. You need ETH on Ethereum for fees. The recorded ETH withdrawal succeeded in eth_call; that simulation is not a mined transaction or a guarantee that every asset can be paid later.

Key registration is not included in that estimate. The official manual says registration can use about 8 million gas. Some assets or keys may not be recoverable through this limited route; no ETH, IMX or USDC balance here proves recovery of an NFT or a different Stark key.

Deadline

No finalization deadline was found in the official manual or the verified withdrawal route. The February cutoff and March migration dates are not claim expiry dates.

Check your address

Scan your address without connecting a wallet or signing. Review the coverage limits and any incomplete warning before relying on a result.

FAQ

Why is the result always marked incomplete?

The standard key cannot reveal other legacy keys you may have used. The three listed assets also cannot rule out a pending withdrawal for another token or NFT. The warning makes that limit explicit.

Do I need to sign a message so the scanner can find my key?

No. This scanner derives only the standard key from the address you provide. It never connects, signs or recreates a Stark key. An unresolved key remains unresolved.

Is the February cutoff a deadline to collect my funds?

No. The official manual uses it to identify which prepared withdrawals it covers. It does not state a finalization expiry date. The scanner records no recovery deadline for this route.

Verified on

2026-11-02. Official finalization manual, bridge proxy and current Sourcify migration implementation, asset registrations, token sources and decimals, pinned reads and a public withdrawal simulation. Connected explorer screens remain pending browser review.

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