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Before you start

  • Wallets: an EVM wallet on Sepolia and/or a Stellar wallet on Testnet. You need the wallet of the chain you’re depositing from. See Connect a wallet.
  • Test funds: Sepolia ETH for gas and XLM on Stellar Testnet. The in-app Faucet covers the bridge tokens (Get test tokens).

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Step 1: Register your settlement key (once per wallet)

Every trading wallet needs a settlement key registered before it can complete a trade. On the BLS Keys page:
1

Derive

Sign the derivation message. Your key is computed from this signature, so you can regenerate it on any device by signing again. There is nothing to back up.
2

Authorize

Sign the registration. It carries a proof of possession, so nobody can register a key they don’t hold.
3

Confirm

The relayer submits the registration to the registries on both chains and pays the gas. The page shows the key as registered once both confirm.
Screenshot coming soon

The BLS Keys page with a registered key

Keys belong to wallets, not accounts. If you trade from two wallets (one per chain), each wallet registers its own key.

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Step 2: Open an order

On the Bridge page, pick the chains and token, then choose an ad. Enter the amount; the app shows what you pay, the fee and what you receive. Set the receive address on the destination chain, then Hold to Bridge. Your wallet then runs the deposit:
  1. Approve in Wallet: a one-time token approval (token routes only)
  2. Submit On-Chain: the deposit into the OrderPortal escrow
  3. Finalize Deposit: the app tells the relayer it landed
Screenshot coming soon

Choosing an amount: what you pay, the fee, what you receive

If you close the wallet popup by mistake, the order waits for you on the Orders page: Complete Order serves the same transaction without reserving more of the maker’s liquidity. Unfunded orders are released after ~30 minutes.

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Step 3: Co-sign

When both deposits are confirmed, the trade page shows Your Turn. Click Co-sign Settlement: your settlement key signs the trade in the app, with no transaction and no gas. The maker signs their half independently, or their agent does.
Screenshot coming soon

The co-sign step on the trade page

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Step 4: Watch it settle

Nothing else to do. The steps advance as the signatures are combined, the proofs are built and the payouts are submitted:
Your tokens arrive at your receive address on the destination chain. The trade page’s timeline links every transaction.
If the trade doesn’t settle by its deadline, it doesn’t get stuck: it can be cancelled and your deposit refunded. See Cancels and refunds.