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There is no meaningful single figure for “Curve gas cost.” A useful audit measures a specific pool implementation, deployed address, chain, build configuration and transaction path. For an integration, that path may include CurveRouterNG and the off-chain route builder—not just the pool’s swap function.
Define exactly what is being audited
Curve has multiple AMM families and generations of contracts. StableSwap is designed for assets that trade near parity; CryptoSwap is designed for more volatile pairs. Current-generation implementations include StableSwap-NG, Twocrypto-NG, Tricrypto-NG and FXSwap, alongside factories and routers. Curve describes this generation as bringing gas optimizations, built-in LP tokens and improved oracle support. Those are design characteristics, not evidence that every call or deployment is cheaper than an earlier implementation.
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Before collecting gas measurements, record the target’s scope:
- Pool family, deployed pool address and verified source revision or code version.
- Chain and the exact deployment being called.
- Compiler version and relevant build settings used to produce the audited bytecode.
- Operation under review, such as a direct pool exchange, a router-mediated swap or a liquidity call.
- Transaction inputs and state assumptions, including token amounts and the pool state used for the comparison.
If any of these differ between two runs, treat the results as different test cases rather than evidence of an optimization.
#1 Best Overall
Audit the whole swap path, not only the pool
Direct pool call
For a direct exchange, measure the specific pool call and its token-transfer path. Keep the inputs and starting state fixed when comparing versions. A pool-only result does not describe an integration that routes through another contract.
CurveRouterNG call
CurveRouterNG supports up to five swaps in one transaction. Its route array has eleven address positions, and route and swap parameters are determined off-chain. Curve’s router documentation says: “The exchange functionality of the router is designed for gas efficiency over ease-of-use.” That describes a design priority; it is not a numerical gas guarantee.
Rank #2
Review the route builder as part of the integration audit. Although it does not consume on-chain gas itself, its output determines the route and parameters supplied to the router. Check that route encoding, token order and swap parameters match the intended path, and benchmark the resulting on-chain call. Compare routes with the same transaction goal and equivalent inputs; a one-swap route and a multi-swap route are not interchangeable gas tests.
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Build a reproducible baseline
- Pin the deployment. Record the chain, contract address, pool family, source revision or code version, and compiler/build settings.
- Specify the transaction. Record whether the call is direct or router-mediated, the exact inputs, route and number of swaps, and the state assumptions. Include the route-construction version or configuration used by the integration.
- Measure comparable outcomes. Run the same successful operation against the before-and-after versions with fixed inputs and equivalent state. Measure reverting paths separately; do not combine their results with successful calls.
- Record the environment. Note the measurement tool and version, plus chain or fork settings. Keep these identical across the comparison.
- Inspect traces for hypotheses. Examine storage reads and writes, arithmetic, external calls, token transfers and loop bounds to identify work worth investigating. These are audit avenues, not claims that a particular Curve implementation has a specific bottleneck.
- Recheck behavior and safeguards. After each change, rerun functional and security checks, verify route encoding, and confirm that minimum-output or minimum-mint constraints remain effective.
Report savings only for the exact before-and-after versions, operation and environment measured. If those details are unavailable, state that the gas cost has not been established rather than supplying a general Curve estimate.
Optimize without weakening user protections
For StableSwap-NG liquidity calls, Curve documents a minimum LP-token mint amount intended to protect users against front-running by MEV bots. Treat that minimum as a functional safeguard, not expendable overhead. An optimization that reduces measured gas but removes or mishandles the minimum-mint constraint changes the security behavior and is not an equivalent comparison.
For swap integrations, similarly preserve the intended minimum-output protection where the transaction path uses one, and verify that the router receives the correctly encoded route and parameters. Compare gas only after confirming that the before-and-after calls provide equivalent protections and outcomes.
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How to interpret published savings
A ChainSecurity Tricrypto audit report describes an upgraded calculation that saved 75% gas by using a closed-form solution. The indexed report is approximately from 2023, but its exact publication year is not confirmed here. The figure applies to that calculation and implementation context; it is not a current benchmark for all Curve swaps, pools or chains, nor a reasonable default expectation for a new audit.
The evidence available here does not establish a current gas figure for a particular pool, router deployment, chain, compiler configuration or transaction. A project’s deployed address and reproducible measurements are necessary to establish one.
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