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Every cross-chain transfer involves two parties: a Maker who provides liquidity on one chain, and a Bridger who moves assets from the other. Neither needs to trust the other: settlement needs both parties’ BLS co-signatures and an on-chain zero-knowledge proof of each deposit.

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The two roles

Maker

A liquidity provider who posts an ad, locks liquidity for each order, and receives the Bridger’s tokens at settlement, plus a fee. A Maker can serve trades by hand or let an agent lock orders within limits they set.

Bridger

A user moving assets across chains. Bridgers deposit against a matching ad and receive the Maker’s tokens on the other chain.
Both roles share one prerequisite: the trading wallet needs a registered settlement key, a one-time step, because every trade settles only with both parties’ signatures.

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How Makers work

1

Create and fund an ad

Post an ad for a route and deposit liquidity into the AdManager contract. The ad names your settlement signer: the wallet whose key co-signs your side of each trade.
2

Lock for an order

When a Bridger funds an order against your ad, lock the matching liquidity. This is your deposit into the trade. An agent can do this for you.
3

Co-sign

Once both deposits confirm, sign the settlement with your settlement key, in the app, with no transaction.
4

Receive the Bridger's tokens

The relayer combines the signatures, proves both deposits and submits the payouts. You receive the Bridger’s full deposit, and the LP fee stays in your ad.

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How Bridgers work

1

Pick a route and deposit

Choose an ad with enough liquidity, enter the amount and fund the order. Your tokens go into the OrderPortal escrow. Native ETH and XLM are wrapped automatically.
2

Co-sign

When both deposits confirm, one click signs the settlement with your settlement key. The trade can’t settle without it.
3

Receive your tokens

The same process settles both chains. You receive the amount less the fee at your receive address.
No sign-up is required. Your connected wallet is your identity, and your settlement key derives from a wallet signature.

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Comparing the two roles

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What protects both sides

Settlement needs three things, all checked on-chain: your signature, the counterparty’s signature (combined into one), and a zero-knowledge proof of each deposit. The relayer can’t forge either signature, can’t invent a deposit, and holds no funds. If a trade doesn’t settle by its deadline, the cancel path returns each side’s funds, and either side can file a dispute. A Maker can also halt settlement on their ads in one transaction, for example if their settlement key may be compromised. While halted, no co-signed payout goes through on that Maker’s ads; trades end through the cancel path instead.