Key Features
What makes Across the fastest, cheapest, and most secure crosschain interoperability protocol.
Feature Highlights
| Feature | Details |
|---|---|
| Sub-2-second fills | Competitive relayer network delivers funds on the destination chain in ~2 seconds on mainnet |
| 26 mainnet chains | Solana, MegaETH, Plasma, Monad, Hyperliquid, and all major L2s |
| CCTP V2 / CCTPFast | Native USDC settlement up to $10M per transaction. CCTPFast offers faster attestation where available |
| Sponsored routes | Zero-fee USDT/USDT0 → USDC-SPOT/USDC-PERPS on HyperCore from Ethereum, Arbitrum, Monad, Polygon, Unichain. |
| Embedded crosschain actions | Compose DeFi operations — swap, bridge, and execute destination-chain calls in a single transaction |
| OFT for USDT0 | Native USDT0 mint-and-burn settlement via LayerZero. More tokens coming soon |
| ERC-7683 standard | Implements the crosschain intent standard for interoperability with other intent-based systems |
| ZK proofs | Succinct/SP1 zero-knowledge proofs enable permissionless chain expansion without governance votes |
Speed
Across's relayer network fills most transfers in ~2 seconds on mainnet. Relayers compete on speed, fronting their own capital on the destination chain and getting repaid later through the settlement process.
Chain Coverage
Across supports 23+ mainnet chains including:
- EVM L2s — Arbitrum, Optimism, Base, Polygon, zkSync, Linea, Scroll, Blast, Mode, Redstone, Zora, and more
- Alt-L1s and new chains — Solana, MegaETH, Plasma, Monad
- App-specific chains — Hyperliquid (HyperCore + HyperEVM)
- Testnet support — 8 testnet chains for development
See the full list here.
Sponsored Routes
Select routes have zero bridge fees, subsidized by the protocol or partners.
Currently sponsored:
- USDT / USDT0 → USDC-SPOT, USDC-PERPS on HyperCore from Ethereum, Arbitrum, Monad, Polygon, Unichain
Sponsored routes change over time. Check the /swap/approval response for fee breakdowns to see if a route is currently sponsored.
Embedded Crosschain Actions
Bridge and execute in one transaction. Attach arbitrary contract calls to your crosschain transfer — the MulticallHandler executes them atomically on the destination chain.
Use cases:
- Swap + deposit into Aave
- Bridge + add liquidity to a DEX
- Transfer + stake on the destination chain
ERC-7683
Across implements the ERC-7683 crosschain intent standard, enabling interoperability with other intent-based protocols and standardized order formats.
V4 — ZK-Powered Expansion
Across V4 introduces zero-knowledge proofs via Succinct's SP1 prover for settlement verification. This enables:
- Permissionless chain expansion — new chains can be added without governance votes
- Faster settlement — ZK proofs replace the optimistic challenge period
- Reduced trust assumptions — cryptographic verification instead of economic security
See Across V4 for technical details.