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PaxDexAdapter

File: contracts/src/adapters/PaxDexAdapter.sol
Pattern: Non-upgradeable
Inherits: Initializable, OwnableUpgradeable, UUPSUpgradeable The PaxDexAdapter is the swap execution layer. It provides a clean swap() interface that CopyTradingVault calls — abstracting away the specifics of the PaxDex Router’s exactInputSingle API. This design allows the swap routing logic to be upgraded without touching vault logic.

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State Variables

VariableTypeDescription
paxDexRouteraddressAddress of the PaxDex V3-style router

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Interface

The adapter targets a Uniswap V3-style exactInputSingle interface: 
interface IPaxDexRouter {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    function exactInputSingle(
        ExactInputSingleParams calldata params
    ) external payable returns (uint256 amountOut);
}

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Functions

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swap

function swap(
    address tokenIn,
    address tokenOut,
    uint256 amountIn,
    uint256 amountOutMinimum
) external returns (uint256 amountOut)
Called by CopyTradingVault.executeGroupTrade() after the vault approves this contract to spend amountIn. Builds the ExactInputSingleParams struct and calls paxDexRouter.exactInputSingle(...). Returns the received output amount.

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setPaxDexRouter

function setPaxDexRouter(address _paxDexRouter) external onlyOwner
Updates the router address — useful if PaxDex deploys a new router version.

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Integration with CopyTradingVault

The adapter acts as a stateless, trusted bridge — the vault never interacts with PaxDex directly. Future router migrations only require a single setPaxDexRouter() admin call with no changes to vault logic.
// Inside CopyTradingVault.executeGroupTrade()
IERC20(tokenIn).safeIncreaseAllowance(address(dexAdapter), amountIn);
uint256 amountReceived = dexAdapter.swap(tokenIn, tokenOut, amountIn, amountOutMinimum);
require(amountReceived >= amountOutMinimum, "Slippage exceeded");
emit TradeExecuted(tokenIn, tokenOut, amountIn);
The adapter acts as a trusted, stateless bridge — the vault never interacts with PaxDex directly, making future router migrations a single admin call.