What does "Insufficient ONG balance" mean? What is ONG? How much ONG do I need?
You need ONG as gas fee on Ontology blockchain. It usually costs 0.05 ONG per transaction.
Both ONT and ONG are utility tokens. Ontology decouples ONT and ONG to alleviate the risk of turbulent fluctuations of the native "asset" value on the gas fee. ONT is used as the staking tool and the time, cost of staking and operating costs of the nodes are considered to be inputs. ONG is used as a value-anchoring tool for on-chain applications and is used in the transactions on the chain.