Abstract: A method of blockchain cross-chain transaction, including at least one of constructing a generic transaction payload based on collected user input, sending the generic transaction payload to an API gateway, checking a generic transaction payload type to determine if it is one of a cross-chain transaction and a native transaction, receiving a bridge link if the generic transaction payload type is the cross-chain transaction, sending the cross-chain transaction to the bridge link, processing the cross-chain transaction, parsing a blockchain id if the generic transaction payload type is the native transaction, identifying a running blockchain node of the parsed blockchain id and sending the native transaction to blockchain to execute at least one of an on-chain transfer, an on-change exchange and an on-chain operation.