LIMESTONE, Data ecosystem for DeFi. Financial data you can trust and afford. LIMESTONE uses Arweave as a base blockchain. Arweave with its affordable permanent storage blockchain appears to be a perfect remedy for the pains of the DeFi sector. Moreover, the Smartweave contracts may help to maintain data integrity managing the reputation of data providers. Arweave offers also a neat monetisation model with the Profit Sharing Token rewarding providers for high-quality data.