Across vs Symbiosis: Which cross-chain bridge fits? (2026)

Across uses an intent-based model: relayers fill transfers on the destination chain, while an optimistic oracle is part of the verification process. The project claims an average of 1.2 seconds from confirmation to funds arriving, but that figure is self-reported and should not be treated as a guaranteed transfer time. Across also offers bridge-and-swap flows, a transfer history, pools and a developer API.

Symbiosis combines bridging and swapping in one step and compares routes by the amount received. You can choose a route or let Symbiosis select one. Its listed features include a REST API, JS SDK and MCP for developers. The key distinction is that Across foregrounds relayer-filled transfers and integrations, while Symbiosis emphasizes broad routing and a single-step swap experience.

Symbiosis has the wider stated coverage: it describes support for 50+ networks and includes Bitcoin, Solana, TON and Tron among its supported options. Its chain list also spans many EVM networks. This breadth can be useful when the asset or destination you need is outside the usual Ethereum-and-rollup routes, though partner liquidity adds another dependency to some routes.

Across lists 22 networks, including Ethereum, several rollups, Solana, Tron and Hyperliquid. It may be a more direct fit if your transfers are within that listed set, particularly when you want to use its bridge-and-swap flow or app integrations. Network support can change, so check that the exact asset and route are available in the app before starting. A chain being supported does not mean every token or route is available.

Neither protocol publishes a fee table. Across says it aims to minimize costs and has no aggregator markup or hidden fees; the quote shows the amount for the selected route before you sign. Its transfer costs can include a relayer fee, destination-chain gas covered by the relayer and any swap pricing. Your own origin-chain gas is separate.

Symbiosis describes its fees as low but does not give figures. Its cross-chain swap cost can include protocol or routing fees, a liquidity-provider share, and gas on the source and destination chains. The expected amount received appears in the app’s quote. These descriptions are not enough to establish which service is cheaper: compare quotes for the same token, amount and route, and include any separate wallet transaction gas when assessing the total.

Both protocols have two audits listed, but neither publishes the audit firms, dates or scope in the information described here. That audit count alone cannot show what was reviewed or whether later changes were covered. Across says transfers are verified onchain, with no multisig custody or single point of failure; it also claims no user funds have been lost. Treat these as statements from the project, not independent guarantees.

Symbiosis describes itself as non-custodial and audited. Its use of multiple networks and partner liquidity means a route can depend on systems beyond Symbiosis itself. Both services still expose users to smart-contract, cross-chain and liquidity risks. Check the destination, token and quote carefully, and consider a small test transfer before moving a larger amount. Never assume that a bridge’s past operation guarantees future safety.

Choose Across if your routes fit its supported networks and you value its intent-based transfer model, transfer history, or integrations with apps such as Uniswap. It also has the higher listed ease-of-use and security scores here. Its claimed transfer speed is a reason to consider it, not a promise that every transaction will settle at that pace.

Choose Symbiosis if you need its broader network coverage, including native BTC support, or want to compare swap routes by amount received in one flow. Its coverage is the clearer differentiator, but routes can involve partner liquidity and additional dependencies. For either option, the fee schedule is not published, so compare the actual quote for your route before signing. TVL is listed at about $16.3 million for Across and $8.6 million for Symbiosis; those figures do not by themselves establish which is safer or better for your transaction.