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API3 aims to turn services that real-world businesses provide into building blocks on the blockchain, which developers will be able to compose into complex use-cases in a trustless way. API3: Build the tooling that will make Web APIs available to smart contracts in the form of first-party oracles. Foster an API-first oracle ecosystem to break through the chicken-and-egg problem that is common in emerging technologies. We introduce a new concept called a Beacon, which is an atomic data feed that is powered by a singular oracle. Beacons will be built on the Air node and carry over the data source.