Which bridge is cheapest to move USDC to Base?
Data as of , refreshed continuously.
Bridge comparison articles publish rack rate fee schedules and stop there. The rack rate is one number in a bill that also includes destination gas, LP fees passed through as slippage, and the effective execution price the router actually delivers. On a $300 USDC bridge to Base, two providers quoting the same 5 bps headline can deliver very different real fees once the router walks the pool. This page answers the specific question retail and small-treasury movers actually search for: at $300 USDC notional, which bridge to Base is cheapest today. OpenChainBench queries the same USDC to Base intent against every major router every 5 minutes, computes the all-in effective fee including destination gas, and publishes the ranked leaderboard live.
Live leaderboard, top 5
Squid Router
#1 · Effective fee
0.017%p99 0.033%
Near Intents
#2 · Effective fee
0.056%p99 0.058%
Across
#3 · Effective fee
0.12%p99 0.12%
Relay
#4 · Effective fee
0.18%p99 0.20%
Mobula
#5 · Effective fee
0.21%p99 0.23%
Full live data: /benchmarks/bridge-fee, refreshed every minute.
Methodology and data sources
Every 5 minutes the harness sends the same intent (source: Ethereum mainnet USDC, destination: Base USDC, amount: $300 notional, receiver: probe wallet) to each router's quote API in parallel. Effective fee is computed as `(source_input_usd - destination_output_usd - destination_gas_usd) / source_input_usd` in basis points, so slippage, LP fees and gas are all inside the same number. Providers that fail to return a quote (5xx, rate limit, timeout) leave the previous gauge in place and increment a fetch_errors_total counter. The leaderboard ranks by 24h average of bridge_effective_fee_bps for the USDC to Base pair. The $300 size is the small ticket regime; sibling benches probe higher notional to expose where routers slip on size.
What this number does not tell you
- ·Quote fee only. This measures router-quoted effective fee, not settlement. Any router that quotes tighter than it settles would show a fast p50 with degraded real-world execution; the sibling bridge-quote-latency bench flags routers where quote-to-settle drift is measurable.
- ·One size, one route. The $300 USDC to Base pair is the highest-search-volume small-ticket bridge query. At $50k notional the leaderboard re-orders because the spread and LP fee components dominate. Producers moving treasury size should read the per-size breakdown on the bench page.
- ·Destination gas at quote time. Destination gas is included in the effective fee at the quoted receiver payout, not at a delayed execution instant. A destination gas spike between quote and settle would degrade the actual fee below what this leaderboard reports.
- ·No canonical CCTP fast path. The USDC canonical bridge via Circle CCTP has different guarantees and speeds than the market-maker routers ranked here. The leaderboard measures the market-maker path (Mobula, Relay, LI.FI, deBridge, Across, Near Intents) because it is the head-to-head every comparison article ranks.
Frequently asked questions
- Which bridge is cheapest for a $300 USDC transfer to Base?
- The bench-fee leaderboard on the Base corridor is at openchainbench.com/benchmarks/bridge-fee. Eight routers compete on the same $300 USDC probe (Mobula, Relay, LI.FI, deBridge, Across, Near Intents, Squid and Socket) and the ranking re-sorts every 5 minutes against fresh Prometheus samples.
- Why $300, and does the winner change at $10k or $100k?
- $300 is the small-ticket regime that dominates retail search. At $10k the leaderboard shifts because aggregator markups compress against intent-based routers (Across, Near Intents, Mobula) whose quotes are less size-dependent. At $100k the spread widens further and the choice becomes size-specific; the per-size tab on the bench page shows the leader at each notional.
- Is Circle CCTP not on this ranking?
- CCTP is Circle's canonical burn-and-mint path for USDC. It has different guarantees, speeds and a fixed protocol path, so it is not directly comparable to market-maker routers that price a swap through a pool. The bench measures the market-maker rankings because that is the choice retail actually makes; canonical CCTP is a separate decision users make once they know their maximum acceptable latency.
- How is Across usually so cheap on this route?
- Across runs an intent-based settlement model where relayers compete to fill from destination inventory. That model compresses the spread component to near zero on high-liquidity pairs like USDC Ethereum to Base. On less-liquid destinations Across loses its edge; that per-destination effect is why the leaderboard re-ranks by pair rather than emitting a single global cheapest bridge.
- Which USDC routers are on this leaderboard?
- Eight routers: Mobula, Relay, LI.FI, deBridge, Across, Near Intents, Squid and Socket. Stargate is not measured because its $300 USDC quote API did not meet the harness's coverage or reliability threshold.
- How often is the leaderboard refreshed?
- Every 5 minutes. The harness probes every router's quote API at that cadence, publishes bridge_effective_fee_bps to Prometheus, and the page reads a 24h rolling average. Because the recording rules re-aggregate every 30 seconds the on-screen ranking re-orders within a minute of any router changing quote behavior.
Related questions
Same data as /benchmarks/bridge-fee, refreshed every minute. Open methodology, open source.