Chainlink Functions Is a Decentralized Serverless Compute Platform, Not Just an API Bridge

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Chainlink Functions allows smart contracts to run arbitrary JavaScript across every node in a Decentralized Oracle Network (DON), with each node executing code independently before OCR consensus aggregates the results. The platform uses threshold-encrypted secrets to protect sensitive data without exposing it to any individual node, making it fundamentally different from a centralized API proxy. The request lifecycle involves multiple contracts — FunctionsRouter, FunctionsCoordinator, and FunctionsClient — each handling distinct roles in billing, consensus, and callback delivery. Developers must inherit the FunctionsClient base contract to correctly implement callbacks, as custom implementations are a common source of integration bugs. This technical breakdown is part of a 28-day Chainlink architecture series and covers the full request flow, contract responsibilities, and billing mechanics.

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