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There is no meaningful single gas figure for a Curve DEX swap, and no reliable way to claim a general saving without naming the pool implementation, chain, deployed code, and exact transaction path. To audit gas, establish a reproducible baseline for the target deployment, measure equivalent calls, and report results only for those conditions.
Why “Curve gas cost” is not one benchmark
Curve supports multiple automated market maker families, factories, routers, and contract generations. StableSwap is designed for assets that trade near parity; CryptoSwap is designed for more volatile pairs. The current-generation implementations include StableSwap-NG, Twocrypto-NG, Tricrypto-NG, and FXSwap, alongside factories and routers. Legacy deployments may use different code.
Curve’s documentation describes current-generation designs as bringing gas optimizations, built-in LP tokens, and improved oracle support. Those are design-level statements, not evidence that every function, pool, or deployment uses less gas than its predecessor. A swap’s measured cost also depends on what the transaction does: the pool and token contracts involved, whether a router is used, the route length, and the state and inputs at execution.
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Define the audit target before measuring
Record the exact scope so another engineer can reproduce the comparison. At minimum, identify:
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- Chain and deployment: chain, pool or router address, and the token contracts involved.
- Implementation: pool family, source revision or verified code version, and whether the deployment is legacy or current-generation.
- Build: compiler version and relevant build settings for the code being compared.
- Operation: direct pool call or router transaction, route, swap count, token amounts, and other transaction inputs.
- Measurement environment: tooling and versions, plus chain or fork settings and state assumptions.
- Baseline: the exact before-version or alternative implementation used for comparison.
If an address, revision, or build configuration is unknown, mark it as unresolved rather than treating a family name as a precise implementation identifier.
Audit the transaction path, not just the pool function
Separate direct calls from routed swaps
A direct pool call and a router-mediated transaction are different paths and should not be presented as interchangeable measurements. CurveRouterNG supports up to five swaps in one transaction. Its route array contains eleven address positions, while route selection and swap parameters are prepared off-chain. That route builder is part of the integration under review: it affects which on-chain calls are executed and how the route is encoded, even though the off-chain calculation itself does not consume transaction gas.
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Curve’s router documentation says: “The exchange functionality of the router is designed for gas efficiency over ease-of-use.” Treat that as the router’s stated design goal, not as a measured saving for a particular route or deployment.
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For a routed integration, inspect how the off-chain component chooses pools, determines swap parameters, and fills the route array. Confirm the encoded route corresponds to the intended sequence of swaps and that the transaction’s protections remain intact. Measure the route the application actually submits, not just an isolated pool method.
Run a reproducible gas comparison
- Freeze the target and baseline. Record the deployed addresses, source revisions, compiler and build settings, tool versions, chain or fork configuration, and comparison version.
- Define equivalent transactions. Use fixed inputs and explicit state assumptions. Keep the operation, route, and relevant call conditions equivalent when comparing versions; otherwise, the difference may reflect a changed transaction rather than an optimization.
- Measure successful and reverting paths. Record each result separately. Reverting calls can have different execution behavior from successful calls, so do not combine them into one figure.
- Inspect traces to test optimization hypotheses. Review storage reads and writes, arithmetic, external calls, token transfers, and loop bounds. These are places to investigate, not established Curve-specific gas problems; use traces from the target path to determine what matters.
- Re-run behavior and security checks after each change. Confirm route encoding, expected swap behavior, and user protections still work. Compare the optimized build against the same fixed cases and environment.
- Report the result with its conditions. State the exact before-and-after versions, operation, inputs, chain or fork settings, compiler/build configuration, and tooling. Limit the claimed saving to those measurements.
Keep user protections in the optimization review
StableSwap-NG liquidity calls use a minimum LP-token mint amount. Curve’s documentation describes this minimum as protection against front-running by MEV bots. Do not remove or weaken it simply to reduce measured gas. For integrations, also verify that any minimum-output requirements and route-encoding checks remain effective after changes; gas improvement is not a success if it changes the intended execution safeguards.
How to interpret the historical 75% figure
A ChainSecurity Tricrypto audit report describes an upgraded calculation that saved 75% gas through a closed-form solution. The figure is specific to that calculation and implementation; it is not a benchmark for a current Curve pool, a router transaction, or Curve swaps generally. The report’s indexed publication age was approximately 3.3 years as of October 7, 2026, but its exact publication year is not established here. Use the result as historical, local evidence—not as an expected saving for another audit.
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What a useful audit result should say
A defensible gas result names the deployment and code being measured, the chain or fork environment, the exact transaction path and inputs, the build and tooling configuration, and the comparison baseline. It also distinguishes successful from reverting calls and explains whether any user protections changed. Without those details, a gas number cannot tell readers how the result applies to their own Curve integration.
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