Sell a canonical-bridge withdrawal while it is still in its 6.4-day challenge period, proven on-chain against the rollup's own commitments.
Get Started6.4 days
Challenge period skipped$51M
Withdrawn in 30 days3,276
Exits never claimed0
Mainnet uses of the hook, everChallenge period
6.4days
45,818 L1 blocks before a withdrawal can be claimed
The problem
The canonical bridge is the only way out of Arbitrum that needs no trust beyond the rollup itself. It is also locked for 6.4 days, and once a withdrawal has started, nothing can speed it up.
Fast bridges are a route you pick before you withdraw, with their own relayers and oracles. Nothing rescues a withdrawal that is already in flight.
Arbitrum One → Ethereum, snapshot 2026-09-29, tokens only. Reproducible from chain data in research/stranded.
How it works
Arbitrum's token gateway has always let the owner of a pending withdrawal hand it to someone else. Exit Market adds the missing piece: proving on-chain that the withdrawal is real.
Start a standard bridge withdrawal on the child chain. Nothing special, nothing extra to trust.
About 15 minutes later the next rollup node posts. Exit Market rebuilds your withdrawal and proves it sits in that node's send root.
Sell to the vault now, or list it at your price for any wallet to buy. Either way it is one transaction, inside the gateway's own hook.
When the challenge period ends a permissionless keeper executes the exit, and its owner, the vault or a buyer, is paid face value.
What you get
Every check runs inside the seller's transaction, against Arbitrum's own contracts. No oracle, no committee, and the market has no owner.
Withdraw straight to the router and sign one order. A relayer settles it and pays the gas, so you never need ETH on the other side.
An ERC-4626 vault buys exits at a small discount and collects face value at confirmation. The discount accrues to LPs.
Live on testnet
Xai Testnet to Arbitrum Sepolia, end to end. Open any of them.
A 2.5 USDG withdrawal leaves Xai TestnetExit #14, a standard bridge withdrawal
0x15e38d3a…5488Sold while still pending, in one signaturev4 market: proven on-chain, no rival on its node chain, price pulled from the vault
0xa6eb8d37…bf55Gasless: settled for a wallet holding 0 ETHExit #16, one signed order; this site's relayer paid the gas
0xdcabb327…2f57Listed at the seller's price, bought by another walletExit #15: 2 USDG for 1.99; the Outbox later paid the buyer face value
0x6ff67081…7031Executed through the Outbox, face value collectedExit #14 after the window: the permissionless keeper ran it, the vault collected
0x69afb2b2…8181Beyond the demo
Arbitrum One runs BOLD, so the verifier walks real pending assertions; on Xai the legacy verifier refuses any node with a rival. Six internal review rounds; every high-severity finding reproduced, fixed and covered by a regression test. Not a third-party audit.
Ready when you are
Connect a wallet on Xai Testnet, start a withdrawal, and sell it as soon as the next node posts.