Cross-chain intent protocols let you specify the result you want—such as receiving a particular asset on another blockchain—while solvers choose how to execute the order. The destination transfer and the settlement that pays the solver are separate steps. If no solver fills the order, a fill misses its deadline, or its proof is delayed, what happens depends on that protocol’s deadlines, custody design and verification rules; ERC-7683 does not provide a universal refund guarantee.
How do cross-chain intent protocols route swaps?
A conventional swap often asks you to select or accept a specific route through liquidity pools or a bridge. With an intent, you instead sign an order describing the outcome and its constraints. A solver—also called a filler in UniswapX materials—decides whether and how to satisfy it.
- You specify the desired outcome. The order can set conditions such as the requested destination asset or amount and an expiry. The exact fields and constraints vary by protocol.
- The order is shared with potential solvers. ERC-7683 describes a typical lifecycle in which an application creates an order and submits it to an order feed. A resolver can translate protocol-specific order details into a more general representation so solvers can inspect the steps, payments and assumptions. This standard does not require every protocol to use the same feed or execution process.
- Solvers decide whether and how to fill. Solvers may use assets they already hold or source liquidity from other venues. In UniswapX, signed orders are broadcast and fillers compete to satisfy them using their own strategies; the protocol does not prescribe one exact filling route.
- The destination asset is delivered. In the cross-chain design described in the UniswapX whitepaper, a filler transfers the requested asset through a destination reactor, which records whether the order was filled before its deadline.
- The result is verified and settlement follows. In that whitepaper example, a settlement oracle relays confirmation to the origin-chain reactor. Once the required confirmation is received, the origin assets and filler bond are released to the filler.
This means the route you see—or the route a solver actually takes—need not be one fixed, user-selected path. Execution and settlement are distinct: delivering the destination asset does not by itself describe how the protocol verifies the delivery or finalizes payment.
What determines the route?
There is no single routing algorithm shared by all intent protocols. A solver’s decision can depend on the signed order’s constraints, the available liquidity, its inventory and strategy, supported chains, market conditions, auction rules and the protocol’s settlement design.
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UniswapX describes competitive auctions and fillers sourcing from public or private liquidity. Uniswap’s API documentation distinguishes AMM routes, which use on-chain liquidity, from UniswapX routes filled by third-party solvers. Whether either route appears can depend on the request configuration and live solver availability. The documentation says a UniswapX route may be unavailable when solvers cannot or choose not to fill; an AMM route can serve as a fallback when the request allows it. Solver activity can vary by chain, so support or availability on one chain should not be assumed for another.
What happens if a cross-chain swap fails?
“Failed” can describe different events. Check which one occurred before assuming the order is refunded or that a transaction was reversed.
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No solver fills the order
An intent can remain unfilled if no solver is able or willing to meet its conditions. Some applications may offer another route, such as an AMM route, if that option is enabled in the request. A fallback is not automatic across all protocols or configurations; check the order status and the application’s route settings.
The fill misses its deadline
The UniswapX whitepaper describes a specific cross-chain design with an origin-chain reactor, a filler bond, a destination-chain fill and a proof deadline. If the filler does not execute the order before that proof deadline, the paper says the user receives the input assets and the filler bond from the origin reactor. That is the recovery behavior of the described design, not a rule that applies to every intent protocol.
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The destination fill occurs, but verification is delayed or challenged
A destination transfer and its proof are not necessarily simultaneous. Until the protocol’s required verification is complete, settlement may not be finalized. The whitepaper’s example relies on a settlement oracle to relay confirmation to the origin chain; another protocol may use different verification and custody arrangements. Review what proof is required, who or what provides it, and what the rules say happens if it is delayed or disputed.
UniswapX’s overview states that failed swaps cost the user nothing. Treat that as a product-specific statement, not a general promise about every cross-chain order, every network fee or every protocol. For a cross-chain order, the relevant deadlines and verification rules determine the documented recovery path.
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What ERC-7683 standardizes—and what it does not
ERC-7683 standardizes a solver-facing way to describe an order; it does not make separate protocols’ custody, execution or security designs interchangeable. It permits different authorization and settlement approaches, including escrow-first and fill-first designs that use resource locks. The standard explicitly does not guarantee the security of the protocol that settles an order.
“This ERC standardizes how a protocol describes an order to solvers; it does not standardize or guarantee the security of the protocol that ultimately settles the order.” — ERC-7683, Ethereum Improvement Proposals.
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In practice, safety depends on the resolver implementation, settlement contracts, assets involved and any off-chain or cross-chain systems the protocol relies on. A shared order format is not, by itself, a refund mechanism or proof that funds will be recovered under every failure scenario.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check before signing a cross-chain order
Read the order details and the protocol’s recovery terms rather than relying on the word “intent” or the presence of a shared standard.
- Output constraints: Identify the destination asset and amount or other output condition you are signing, plus any expiry or price limit.
- Solver access and routing: Check how orders reach solvers, who can fill them, and whether a solver can use its own inventory or outside liquidity.
- Custody and execution order: Find out whether assets are escrowed before a destination fill or whether a resource lock supports fill-first execution.
- Verification: Determine what proves the destination result, which oracle or messaging system relays it, and what assumptions that system introduces.
- Failure cases and timing: Look separately for the rules on no fill, a late fill, missing proof and a challenged fill. Check what can be returned and when.
- Availability and fallback: Confirm that the relevant chains and assets are supported, and whether the application can offer another route if solvers are unavailable.
These questions are useful when comparing protocols because their answers can differ even when both use intent-based orders. Do not infer that one is safer or faster without evidence about its actual settlement design and operation.
What performance figures can you compare?
The cited protocol materials do not establish a comparable, independent cross-chain intent failure rate, typical completion time or solver-concentration figure. A headline volume or transfer count from a provider is not a substitute for those measures. Compare protocol-specific published metrics only when their definitions, period, chains and measurement method are clear.
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