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Access External Data in Solidity: A How-To Guide Guide to accessing external data with solidity or smart contract. The FDA API is the standard for fetching and sending data on the web that you know and love today. We are going to use just one data source (the FDA API) and one blockchain oracle (we will explain what that is in a minute) For developing your smart contracts, starting centralized is fine, just remember to make it decentralized when you go to production.