Mantle forced inclusion adds an Ethereum fee to withdrawals

Mantle’s forced-inclusion mechanism lets users submit an exit through Ethereum if the sequencer will not process it, adding an Ethereum transaction fee to the withdrawal. It is a fallback for a stalled or censored transaction, not a cheaper version of the standard bridge route.

What does forced inclusion change?

Forced inclusion sends a transaction through Mantle’s Layer 1 contracts so it can be included on Mantle without relying on the sequencer. That path gives users another way to initiate a withdrawal when ordinary sequencing is unavailable.

The added cost is the Ethereum gas for submitting the forced transaction. Ethereum congestion and the work required by the transaction affect the fee, so there is no fixed surcharge; the wallet’s estimate is the practical figure to check. For the ordinary route and its stages, see this Mantle Bridge explainer.

Which withdrawal costs remain?

Forced inclusion does not erase the costs of moving the asset through the bridge. The user still needs to account for the Mantle-side transaction and, once the withdrawal is ready, the Ethereum transaction that claims the funds.

• Forced submission: Ethereum gas to send the fallback transaction.
• Mantle execution: MNT for processing the withdrawal on Mantle.
• Final claim: Ethereum gas to complete the withdrawal when it becomes claimable.

These are separate transactions, and the forced route may add an Ethereum payment before the usual claim. The amount varies with Ethereum gas prices; a quoted fee for one step does not cover the others.

When is the extra fee worth paying?

For most readers, the standard withdrawal is the lower-cost choice while the sequencer is processing transactions normally. Forced inclusion buys a route around sequencing failure or refusal, so its value is access and liveness rather than a lower fee.

Before using it, compare the fallback transaction’s Ethereum gas estimate with the value and urgency of the withdrawal, and keep enough ETH for the later claim. Forced inclusion can get a transaction submitted for processing, but it does not itself deliver funds to Ethereum.

What happens after a forced withdrawal?

The forced transaction must be included and processed on Mantle before the bridge’s Ethereum-side settlement and claim can finish. Users should track the withdrawal status and budget for the final claim rather than treating forced submission as receipt of funds.

The exact fee depends on Ethereum conditions when the transaction is sent. Whether the fallback route will be needed, and how much it will cost at that time, remains unknown until sequencing fails and the wallet shows a live estimate.