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Clarify that the API rejects orders with a non-zero feeAmount and add a known issue explaining that the settlement contract still honors a signed fee, so taking it during settlement is expected behavior.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe documentation updates describe signed fee handling across settlement contracts, auction order schemas, and intents. They state that signed fees must be zero and explain how settlement treats non-zero signed fees. ChangesSigned Fee Documentation
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~8 minutes Change: Other Suggested reviewers: Merge Risk: 🔵 Low · up to Readers may infer that non-zero pre-signed order fees are supported and build orders the API rejects. Clarify the solution-fee wording before relying on this reference. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
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Inline comments:
In `@docs/cow-protocol/reference/core/auctions/schema.md`:
- Line 102: Update the fee-mode description in the solutions section near
“pre-signed or solver computed” to state that auction orders have a zero
pre-signed fee and the solver computes the execution fee, consistent with the
zero `feeAmount` rule.
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docs/cow-protocol/reference/contracts/core/README.mdxdocs/cow-protocol/reference/contracts/core/settlement.mddocs/cow-protocol/reference/core/auctions/schema.mddocs/cow-protocol/reference/core/intents/README.mdx
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| - `penaltyCapNative`: a stringified integer denoting the cap on the penalty a solver can incur for winning this order but not settling it within the auction deadline, measured in terms of the smallest denomination of the native token of the chain. See the [solver rewards](/cow-protocol/reference/core/auctions/rewards#penalty-caps) page for how this cap is computed and used. | ||
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| We clarify here that all `market` orders have a potentially non-zero predetermined fee, while all `limit` orders have necessarily a zero signed fee, and the actual fee charged to the order is computed and provided by the solvers when they propose an execution of such an order. More details are provided in the [solutions section](#solutions-output). | ||
| We clarify here that all orders have a zero signed fee (`feeAmount`), and the actual fee charged to the order is computed and provided by the solvers when they propose an execution of such an order. More details are provided in the [solutions section](#solutions-output). |
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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win
Clarify the solution fee mode.
Line 102 says each auction order has feeAmount = 0 and the solver provides the execution fee. Line 173 still says a solution fee can be “pre-signed or solver computed.” This leaves it unclear whether non-zero pre-signed fees are valid. Update Line 173 to match the zero-signed-fee rule, or state that the pre-signed value must be zero.
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In `@docs/cow-protocol/reference/core/auctions/schema.md` at line 102, Update the
fee-mode description in the solutions section near “pre-signed or solver
computed” to state that auction orders have a zero pre-signed fee and the solver
computes the execution fee, consistent with the zero `feeAmount` rule.
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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
| ### Signed fee amount | ||
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| The order struct still contains a `feeAmount` field, which the settlement contract honors: if an order is signed with a non-zero `feeAmount`, that amount is transferred from the user in addition to the executed sell amount (pro rata for partially fillable orders). | ||
| The limit price is checked against `sellAmount` and `buyAmount` only, so the effective price of an order with a signed fee is `buyAmount / (sellAmount + feeAmount)`. |
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This formula shows the lowest rate the order allows. The trade can get a better rate, right? Should we call this the minimum rate?
| - `penaltyCapNative`: a stringified integer denoting the cap on the penalty a solver can incur for winning this order but not settling it within the auction deadline, measured in terms of the smallest denomination of the native token of the chain. See the [solver rewards](/cow-protocol/reference/core/auctions/rewards#penalty-caps) page for how this cap is computed and used. | ||
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| We clarify here that all `market` orders have a potentially non-zero predetermined fee, while all `limit` orders have necessarily a zero signed fee, and the actual fee charged to the order is computed and provided by the solvers when they propose an execution of such an order. More details are provided in the [solutions section](#solutions-output). | ||
| We clarify here that all orders have a zero signed fee (`feeAmount`), and the actual fee charged to the order is computed and provided by the solvers when they propose an execution of such an order. More details are provided in the [solutions section](#solutions-output). |
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The auction example includes feeAmount, but the solver auction data does not. Please remove it from the example.
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Also, the example says the fee is zero because this is a limit order. The new text says every auction order has a zero signed fee. Please update the example.
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Description
The docs could be a bit more explicit about
feeAmountbeing zero.Also, connects it to the API check, and disrecommend signing any order with anything but zero.
Explains the settlement contract still honors
feeAmount, so an order signed with a non-zero fee (outside the API) will have that fee taken on settlement. This is expected, since the user signed it, but it isn't documented anywhere.Specifically, names the potential issue on buy orders with partial fills issue when fee is non-zero.
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