Across

Across is one of the fastest and cheapest ways to move assets between Ethereum and its rollups. If your transfer stays inside the EVM world, especially between L2s like Arbitrum, Base and Optimism, it is often the best single bridge you can pick.

It is built by Risk Labs, the team behind UMA. That heritage shows in the design, which leans on UMA’s optimistic oracle for settlement.

What is Across?

Across is a bridge, not an aggregator. It does not try to connect every chain in crypto. Instead it does one thing very well: fast, capital-efficient transfers across Ethereum and the major rollups.

Rather than lock your tokens and mint a wrapped version on the other side, Across uses an intents model backed by a single shared liquidity pool. That choice is what gives it both speed and a clean asset on the destination chain.

How Across works

You express an intent, for example “move 1,000 USDC from Optimism to Base.” A competitive network of relayers races to fill it. One of them fronts the destination funds almost instantly from its own capital.

The relayer is then reimbursed from the shared pool after an optimistic verification window, with disputes handled by UMA’s oracle. You get your funds up front. The accounting happens behind the scenes.

This is the key difference from older bridges. You are not waiting on a slow lock-and-mint cycle. You are getting a relayer to advance the funds and settle later.

Supported chains and assets

Across covers Ethereum and its main rollups, including Arbitrum, Base, Optimism, Polygon, zkSync and Linea, with the list growing over time. It focuses on common assets like ETH, USDC and other bluechips where the shared pool has depth.

What it does not do is reach beyond EVM. There is no Solana, Cosmos or Bitcoin support here. If you need those, an aggregator like Rango or Jumper is the better tool.

Fees: what you actually pay

Across is usually among the cheapest options for L2 routes. You pay a small relayer fee plus gas, and there is no wrapped-asset overhead inflating the cost.

For most users the practical test is simple. Compare the amount you receive on Across against an aggregator quote for the same pair. On its core routes, Across frequently wins.

Speed and reliability

This is where Across stands out. Because relayers front the funds, transfers often settle in seconds rather than minutes. On busy L2 routes that speed is consistent, since there is an active relayer market competing to fill orders.

Security: how your funds are protected

Settlement relies on UMA’s optimistic oracle and a bonded relayer set, and the protocol has been audited. The optimistic design adds a dispute window, but that sits behind the scenes. Your funds are filled up front by a relayer who carries the risk during verification.

The model also avoids large pools of locked, wrapped assets, which have historically been a target in bridge hacks. As always, verify the official domain before you connect.

Who should use Across

• Anyone moving funds between Ethereum L2s who wants speed and low cost.
• Users who prefer receiving a native asset instead of a wrapped token.
• People who value a focused, well-audited bridge over a broad aggregator.

If your route touches a non-EVM chain, Across cannot help. Pair it with an aggregator instead.

How to use Across safely

1. Confirm you are on across.to. Bookmark it rather than searching each time.
2. Connect your wallet and choose the source chain, destination chain and asset.
3. Review the fee and the amount received before approving.
4. Send a small test amount the first time, then the full transfer.
5. Wait for the destination confirmation before moving on.

Alternatives to Across

For routes that cross into Solana or Cosmos, use Jumper, Squid or deBridge. For native stablecoin movement across more chains, look at Stargate. Compare them all on the best cross-chain routers page.

Verdict

If you live on Ethereum L2s, Across is hard to beat for speed and price. Its narrow focus is a feature, not a flaw. Just remember it stays inside the EVM world, so keep an aggregator handy for everything else.