Bridge Gas Fee Right Now
How much does it cost in gas to bridge from Ethereum mainnet to a Layer 2 right now? The card below shows today's exact USD fee for a typical bridge deposit across three priority tiers — calculated live from real-time gas prices and the current ETH/USD rate.
Live bridge deposit cost
200,000 gas units · ETH ≈ $2,259
Standard
$0.0454
0.100 Gwei
Lowest tier that confirms in a few minutes.
Fast
$0.0633
0.140 Gwei
Default wallet tier — confirms in about a minute.
Rapid
$0.2669
0.591 Gwei
Top priority — confirms in under 30 seconds.
Base fee right now: 0.098 Gwei. Tier prices add the average priority tip seen in recent blocks. Wallets often pad estimates by 10–30%, so your actual quote may be a bit higher.
What goes into a bridge deposit fee
A bridge deposit transaction locks your ETH (or tokens) inside a mainnet smart contract, then emits a cross-chain message that the L2 picks up and uses to mint the equivalent on the destination chain. The locking step + cross-chain message + accounting updates push gas to roughly 200,000 units — about 10x a plain ETH transfer.
Some bridges (Across, Hop, Stargate) use a slightly cheaper path (~150,000 gas) by routing through a relayer model — but they charge a small protocol fee on top to compensate the relayer.
Where to bridge — picking the destination
The deposit gas (paid on mainnet) is similar across destinations. The difference is what you'll do once you arrive:
How to reduce your bridge gas cost
- Bridge during a low-gas window. Bridges are not time-sensitive. Wait for late-night UTC or a weekend and save 30–60%.
- Pick Standard tier. Bridge deposits aren't urgent — the L2 side processes in 5–15 minutes regardless of your mainnet tier choice.
- Bridge bigger, less often. Five $200 deposits cost 5x the gas of one $1,000 deposit. Concentrate moves.
- Skip the bridge if you have Coinbase. Coinbase supports free direct withdrawals to Base and other L2s. No bridge transaction, no gas.
- Compare third-party bridge fees. For small amounts, official bridges are cheaper. For larger, third-party often wins on total cost.
Frequently asked questions
How much does it cost to bridge from Ethereum to an L2 right now?
The live USD figures above use a 200,000 gas estimate — a typical deposit through an official L2 bridge (Arbitrum Bridge, Optimism Gateway, Base Bridge, Polygon Portal). Third-party bridges (Hop, Across, Stargate) often use a similar amount.
Why is bridging more expensive than a simple transfer?
A bridge deposit calls a smart contract that locks your ETH/tokens on mainnet, then emits a message that the L2 reads to mint the equivalent on the destination chain. The contract logic plus the cross-chain message overhead push gas to ~200,000 — about 10x a basic transfer.
Do I pay gas on both chains when bridging?
For mainnet → L2 deposits, you only pay mainnet gas. The L2 side is automatic and the L2 native fee for receiving is usually under $0.01. For L2 → mainnet withdrawals, you pay L2 gas to initiate, then mainnet gas later to claim the funds on L1.
Are third-party bridges cheaper than official bridges?
Sometimes. Hop, Across, and Stargate often use less gas (~150,000) but charge a small bridge fee on top. Official bridges have zero protocol fee but use more gas. For small amounts the third-party fee dominates; for large amounts the gas math matters more.
When is bridging cheapest?
Bridging gas tracks mainnet base fee. Bridge during a calm mainnet window — late UTC nights, weekends — and you can cut the cost in half. Bridging during congestion is the most expensive time.
How long does a bridge take?
Mainnet → L2: usually 5–15 minutes. L2 → mainnet via official bridge: 7 days for optimistic rollups (Arbitrum, Optimism, Base) because of the challenge window. Third-party bridges complete in minutes for a fee.
Is bridging back to mainnet worth the gas?
For small amounts (under $100), the round-trip gas often exceeds the L2 savings. For larger amounts the math flips. If you bridged $1,000 to an L2, did 20 swaps there for $0.50 each (vs $10 each on mainnet), the round-trip is well worth it.
Related ETH gas tools and guides
Pick the cheapest destination L2.
Compare live gas on Arbitrum, Optimism, Base, and Polygon so your post-bridge activity lands on the cheapest network.