Onchain Loteria game utilizes a tech stack featuring Nextjs, Frog Frame, Farcaster, Syndicate's Transaction API, and Airstack.explorer. Nextjs aids in building server-side rendered applications, while Frog Frame develops interfaces for the decentralized Farcaster network. Syndicate’s API handles transactions on the Degen Chain, supported by Arbitrum Orbit and Base, with Airstack.explorer fetching NFT data. It is all available on public repos.