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№ 003 · BridgesLive

Cross-Chain Bridge — Fee

What a user actually pays — fees, slippage and destination gas combined, as a percentage of trade size.

Last run

Apr 28, 2026, 9:34 PM UTC

Sample size

86,055

Providers

4

Lead

Mobula

Mobula leads at 0.033% — about 92% under the field median.

Mobula · p50

0.033%%

Cross-route median fee

Field median

0.39%%

Median across 4 providers

Tail spread (p99)

35.9×

Worst p99 1.20% vs lead 0.033%

Abstract

We measure the effective fee each bridge charges — the bottom-line cost a user pays, fees plus slippage plus destination gas — as a percentage of trade size. The harness uses Prometheus gauge `bridge_cost_percent` rather than the narrower `bridge_fees_percent` because providers structure pricing differently — some charge an explicit fee, others bake it into the spread. Comparing only the explicit fee field would let aggregators with implicit pricing show a misleading 0%. Sampled at $300 notional so small-amount fixed-fee blowups don't skew the percentile aggregates. Lower is better.

Distribution

Fig. 1Effective fee distribution
00.2%0.4%0.6%0.8%1%
↓ Field median
  • 01Mobula
    0.033%
  • 02Relay
    0.043%
  • 03LiFi
    0.31%
  • 04Debridge
    1.18%
p50p90 p99
Source · Run Apr 28, 2026, 9:34 PM UTC · 86,055 samplesNote · Lower is better. Range is p50 → p99; pill is each provider's signature color. Failed requests are excluded from latency aggregates and counted toward success rate.

Full ledger

Fig. 2Latency, reliability and 24-hour trend
Providerp50p90p99MeanSuccess24h trend
MobulaLead

Aggregator + intent layer

0.033%0.033%0.033%0.033%100.00%
Relay

Cross-chain relay

0.043%0.053%0.063%0.044%100.00%
LiFi

Aggregator

0.31%0.34%0.35%0.32%100.00%
Debridge

Native-token fees

1.18%1.19%1.20%1.18%100.00%
Source · Cross-region medians, all providers

Methodology

  • —Routes: USDC pairs spanning Solana, Base and Arbitrum.
  • —Reference notional: $300 USDC. Smaller sizes ($5, $50) are captured by the harness but excluded from this report.
  • —Cost: `bridge_cost_percent{amount_usd="300"}`, in percent of notional. Includes fees + slippage + destination gas.
  • —Cadence: full sweep every 5 minutes for 24 hours.
  • —Region: eu-west (single point — multi-region requires running additional monitor instances).
  • —Failures (quote_failed, unsupported route) excluded from cost aggregates and counted toward success rate.

Source code: OpenChainBench/OpenChainBench/tree/main/harnesses/bridge-fee

Cite this report

@misc{openchainbench-003,
  author       = {{OpenChainBench}},
  title        = {Cross-Chain Bridge — Fee},
  year         = {2026},
  howpublished = {\url{https://openchainbench.xyz/benchmarks/bridge-fee}},
  note         = {Run on Apr 28, 2026, 9:34 PM UTC}
}
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