SymmioPartyB Contract

The SymmioPartyB contract is the core execution proxy for Party B actors. It provides secure routing, multi-call support, and fine-grained permissioning for interactions with the Symmio core contracts.

This contract allows Party B to batch trade operations, authorize token flows, and interface with both internal and whitelisted external contracts.

Core Functions

🔹 Symmio Call Dispatcher

function _call(bytes[] calldata callDatas) external;

Forwards multiple encoded calls to the Symmio core (e.g., opening or closing trades). Enforces selector-level permissions:

• restrictedSelectors[sel] == true: requires MANAGER_ROLE

• otherwise: TRUSTED_ROLE or InstantLayer delegate is sufficient

Reverts if any call fails.

🔹 Multicast Executor

function _multicastCall(
    address[] calldata dests,
    bytes[] calldata datas
) external;

Sends parallel external calls to approved targets. All destination contracts must be whitelisted. Requires TRUSTED_ROLE.

🔹 Token Management

function _approve(address token, uint256 amount) external;

Sets Symmio token allowances. Callable by TRUSTED_ROLE.

function withdrawERC20(address token, uint256 amount) external;

Withdraws tokens to the caller. Restricted to MANAGER_ROLE.

🔹 Configuration Functions

function setRestrictedSelector(bytes4 sel, bool state) external;

Marks a core selector as restricted to MANAGER_ROLE.

function setMulticastWhitelist(address addr, bool state) external;

Controls which external contracts can be called via _multicastCall.

function setSigner(address newSigner) external;

Updates the ERC-1271 signer address used for off-chain validation.

🔹 Signature Verification

function isValidSignature(
    bytes32 hash,
    bytes calldata sig
) external view returns (bytes4);

Returns 0x1626ba7e if signature is valid; otherwise 0xffffffff.

🔹 Emergency Controls

function pause() external;
function unpause() external;

Enables or disables contract functions under emergency conditions. Controlled via PAUSER_ROLE / UNPAUSER_ROLE.

Once the cooldown period has elapsed, the withdrawal can be finalized:

function completeWithdraw(uint256 id)