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Fix Fee AMM rebalancing rate description #11

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jxom merged 1 commit into from
Jan 20, 2026
Merged

Fix Fee AMM rebalancing rate description #11

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6 changes: 3 additions & 3 deletions src/pages/protocol/fees/spec-fee-amm.mdx
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Expand Up @@ -6,7 +6,7 @@ description: Technical specification for the Fee AMM enabling automatic stableco

## Abstract

This specification defines a system of one-way Automated Market Makers (AMMs) designed to facilitate gas fee payments from a user using one stablecoin (the `userToken`) to a validator who prefers a different stablecoin (the `validatorToken`). Each AMM handles fee swaps from a `userToken` to a `validatorToken` at one price (0.9970 `validatorToken` per `userToken`), and allows rebalancing in the other direction at another fixed price (0.9985 `validatorToken` per `userToken`).
This specification defines a system of one-way Automated Market Makers (AMMs) designed to facilitate gas fee payments from a user using one stablecoin (the `userToken`) to a validator who prefers a different stablecoin (the `validatorToken`). Each AMM handles fee swaps from a `userToken` to a `validatorToken` at one price (0.9970 `validatorToken` per `userToken`), and allows rebalancing in the other direction at another fixed price (1.0015 `userToken` per `validatorToken`).

## Motivation

Expand All @@ -27,7 +27,7 @@ The system is designed to minimize several forms of MEV:
The Fee AMM implements two distinct swap mechanisms:

1. **Fee Swaps**: Fixed-rate swaps at a price of `0.9970` (validator token per user token) from `userToken` to `validatorToken`
2. **Rebalancing Swaps**: Fixed-rate swaps at a price of `0.9985` (validator token per user token) from `validatorToken` to `userToken`
2. **Rebalancing Swaps**: Fixed-rate swaps at a price of `1.0015` (user token per validator token) from `validatorToken` to `userToken`

### Core Components

Expand Down Expand Up @@ -82,7 +82,7 @@ function rebalanceSwap(
) external returns (uint256 amountIn)
```

Executes rebalancing swaps from `validatorToken` to `userToken` at fixed rate of 0.9985 (validator token per user token). Can be executed by anyone. Calculates `amountIn = (amountOut * N) / SCALE + 1` (rounds up). Updates reserves immediately. Emits `RebalanceSwap` event.
Executes rebalancing swaps from `validatorToken` to `userToken` at fixed rate of 1.0015 (user token per validator token). Can be executed by anyone. Calculates `amountIn = (amountOut * N) / SCALE + 1` (rounds up). Updates reserves immediately. Emits `RebalanceSwap` event.

```solidity
function mint(
Expand Down