Just shipped the Across Prime paper, a new design for a capital efficient trustless fast bridge authored with @danrobinson, @mrice32, and the @AcrossProtocol team.
Across Prime aims to deliver the near instant speed of intent based bridges but with greater capital efficiency. 🧵
Across Prime aims to deliver the near instant speed of intent based bridges but with greater capital efficiency. 🧵
One key question in designing intent-based bridges is how to solve the problem of fair exchange. What prevents the relayer from taking the user’s payment without filling their intent?
There are three mechanisms for this:
There are three mechanisms for this:
Trusted relayers: the user puts full trust in the relayer. They send the relayer funds on the origin chain and trust the relayer to fill on destination.
Pros: simplicity
Cons: big trust assumption
Pros: simplicity
Cons: big trust assumption
Escrowed relayers: user funds are locked in escrow and released only after the protocol "verifies" that the relayer filled the intent. This is the model @AcrossProtocol uses today.
Pros: trustless; relayers can compete on price/speed
Cons: relayer capital is locked for ~1hr
Pros: trustless; relayers can compete on price/speed
Cons: relayer capital is locked for ~1hr
Across Prime introduces the Bonded relayers model: user funds are guaranteed by a relayer bond, with the bond determining the maximum amount that the relayer can have “in flight” at any given time.
Pros: trustless; capital efficient
Cons: user must observe destination chain
Pros: trustless; capital efficient
Cons: user must observe destination chain
For common sized transactions, we think the Across Prime design can be orders of magnitude more capital efficient. The paper describes an example with a 900x improvement in capital efficiency:
More capital efficiency means cheaper intents and greater scalability. The same amount of relayer capital can support (much) higher volumes on many more chains.
This helps us get ~intents everywhere~ @rudolf6_
This helps us get ~intents everywhere~ @rudolf6_
Across Prime is intended to be a clean articulation of a relative simple idea. It's a research project that builds on Across + the ERC7683 standard for crosschain intents.
Big thanks to @danrobinson and the @paradigm team, who again demonstrated their commitment to pushing Ethereum forward with more than just check writing.
Big thanks to @danrobinson and the @paradigm team, who again demonstrated their commitment to pushing Ethereum forward with more than just check writing.
Full paper here. Feedback is welcome. paradigm.xyz/2025/05/across…
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