OpenTrade Custodial Wallet 4 API endpoints for custodial wallet creation, account query, swap execution, and native token withdrawal. IMPORTANT : Custodial wallet only supports BSC and Solana networks. IMPORTANT : Newly created wallets have zero balance. You must deposit BNB (to the BSC address) or SOL (to the Solana address) before you can swap or withdraw. Do NOT send tokens from other chains (e.g., Ethereum, Polygon, Arbitrum) to these addresses — funds sent from unsupported chains will be lost. Pre-flight Checks Every time before running any custodial wallet command, always follow these s…