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Lesson 28 of 31 · Bridge
Bridge fees explained
The 'bridge fee' is rarely the whole cost. Five components stack up — and the net amount received is the only number that matters.
The cost of a bridge is usually several components summed together, not a single "bridge fee."
The five components
- Gas on the source chain — paid to submit the lock or burn transaction on the outgoing network. It varies with that network's congestion.
- Gas or settlement on the destination chain — minting or releasing the asset on the destination also has a cost, charged to you directly or indirectly.
- Bridge protocol / service fee — a percentage or flat amount charged by the bridge operator for the service and for its validation and security infrastructure.
- Liquidity cost or spread — in liquidity-pool-based bridges you pay a spread or fee to liquidity providers, similar to swap slippage. It's larger when the pair's liquidity is thin or the amount is high.
- Optional speed premium — some bridges offer faster finalization for an extra fee, versus a cheaper, slower option.
Best practices
- Compare the net amount received, not the advertised fee — spread and destination gas often weigh more than the nominal fee.
- Be wary of bridges with very thin liquidity or opaque trust models.
- For large amounts, consider splitting the transfer to reduce spread impact.
Why it matters. Bridges compete on a headline "fee" that frequently hides most of the real cost in spread and destination gas. Training yourself to look only at how much actually arrives on the other side is the single habit that stops you from picking the "cheap" bridge that quietly costs the most.