Across Protocol
score
Fees: Low relayer fee + gas; often cheapest for EVM transfers
A strong default for users bridging between Ethereum and its major L2s who want speed and low cost with a conservative security design. The main caveat is limited reach beyond EVM chains, so it will not cover every route. This is not financial advice.
What Across Protocol is
Across Protocol is a cross-chain bridge for moving assets between Ethereum and its major Layer 2 rollups. Launched in 2021 and built by the UMA/Risk Labs team, it uses an intents-and-relayers design: professional relayers front the user their funds on the destination chain almost immediately, then get repaid through a UMA optimistic-oracle settlement layer on the back end. The practical effect is that your money is filled quickly and does not sit on the critical trust path while the accounting is squared up.
How it performs where it counts
This is where Across earns its 8.4 overall. It scores 9 for track record and 9 for speed, backing up the reputation for fills that land in seconds to about a minute, plus a clean history with no major exploit of the core protocol. Security and audits sit at 8.5, reflecting a conservative design and regular reviews from an experienced team. The clear weak spot is chain coverage at 6.5, since the network stays firmly inside the EVM world.
What it costs
Fees score 8.5, among the best in this category. Users pay a small relayer fee plus gas, and for standard EVM-to-EVM routes Across is frequently the cheapest option on the board. Pricing is competitive because relayers compete to fill your intent, though very large or unusual transfers can see fees widen or fills slow when relayer liquidity is thinner.
The main caveat
Two things to keep in mind. First, coverage is EVM-centric, so there is no Solana or other major non-EVM support and Across simply will not serve some routes. Second, the optimistic settlement that makes the model efficient introduces a dispute-window trust assumption on the back end, even though it keeps user funds off the direct trust path. Neither undermines the strong scores, but both shape what Across can and cannot do.
Who it should suit
Across is a strong default for anyone regularly bridging between Ethereum and its leading L2s who wants speed and low cost paired with a cautious security architecture. If your routes stay within EVM chains, it is hard to beat; if you need to reach non-EVM networks, you will need a broader bridge alongside it. This is not financial advice.
Overall 8.4 / 10 — the weighted average of the criteria above. How we score →
- + Intents/relayer model with a UMA optimistic-oracle settlement layer that keeps user funds off the critical trust path
- + Clean incident history with no major exploit of the core protocol
- + Consistently fast fills (often seconds to a minute) and competitive pricing
- + Backed by the experienced UMA/Risk Labs team with regular audits
- − Coverage is EVM-centric — no Solana or major non-EVM chains
- − Relayer/liquidity model can widen fees or slow fills for large or exotic transfers
- − Optimistic settlement adds a dispute-window trust assumption on the backend
Is Across Protocol safe to use?
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It scores well on security (8.5) and track record (9), with regular audits and no major exploit of the core protocol to date. The intents/relayer model keeps user funds off the critical trust path, though the optimistic settlement layer adds a back-end dispute-window assumption. As with any bridge, verify the official app and consider your own risk tolerance.
What are Across Protocol's fees?
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You pay a small relayer fee plus network gas. Fees rate 8.5 in our scoring, and for common EVM transfers Across is often the cheapest choice because relayers compete to fill your order. Large or exotic transfers can carry wider fees when relayer liquidity is limited.
Which chains does Across Protocol support?
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It focuses on Ethereum and its major Layer 2 rollups. Chain coverage is its lowest criterion at 6.5 because it is EVM-only, with no Solana or other non-EVM networks, so some routes are not available.
How does Across Protocol work?
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You submit an intent to bridge an asset. A relayer immediately fronts the funds to you on the destination chain, then reclaims them through a UMA optimistic-oracle settlement process. That is why fills are typically fast, often seconds to a minute.
Is Across Protocol a good bridge?
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For EVM users it is one of the strongest options, with an 8.4 overall driven by top marks for speed, track record and fees. The main limitation is its EVM-only reach, so it is excellent within that scope but not a full multichain solution.