Polymarket ghost-fill counterparty risk. POST {wallet}. Returns wallet_type (eoa | smart_account_erc1967 | legacy_smart_account), ghost_fill_risk (low/medium/high), 24h collateral outflow flag. Deposit wallets (POLY_1271, sig type 3) are ghost-fill-immune by design. For MM agents pricing adverse selection before quoting against a maker.