According to Foresight News, Starknet core developer antiyro shared on-chain data revealing that a transaction in block number 524884 of the Starknet network used STRK to pay for gas fees around 16:00 Beijing time on January 30th. Foresight News also discovered several other transactions using STRK to pay for gas fees. Previously reported, on January 10th, the Starknet v0.13 upgrade was launched on the Starknet mainnet. The v0.13.0 upgrade significantly reduces costs through more efficient transactions and is responsible for the technical preparations for using STRK to pay fees.