How to Understand and Query Farcaster Data (Casts, Users, Channels, and Frames)

This guide explains Farcaster's data structures and how to query them through Dune and Neynar, and it says Dune is the right choice for joining onchain activity to Farcaster tables while Neynar suits building apps or bots. Dune gets its Farcaster tables from Neynar every 12 hours, and Neynar runs its own hub. The guide says Farcaster has three onchain contracts on Optimism acting as registries for ids, storage and keys, and that the bulk of actual Farcaster data (profiles, casts, channels, reactions, links and verifications) is stored on hubs. Clients such as Warpcast store custom data like private messages, frame actions and warps that are not published to hubs.