Arcadia — Backend

The stateful API + trusted signer for Arcadia. This is the Next.js app deployed to Render (always-on). It serves /api/*, holds the in-memory session store (server/sessions.ts) and the settlement signer keys, and signs the final multiplier each chain's settle verifies (server/signer.ts: EIP-712 for Celo, secp256k1-over-consensus-buff for Stacks).

Same Next.js codebase as arcadia-frontend, deployed with BACKEND_URL unset so it serves its own /api routes. Must be always-on — the session store is in process memory and a sleeping host drops every in-flight game.

Run locally

npm install
cp .env.example .env.local      # fill in NEXT_PUBLIC_* + the SECRET signer keys
npm run build && npm start      # serves /api with the in-memory store

Deploy

See DEPLOY_BACKEND.md and render.yaml.

Related folders (siblings)

• arcadia-frontend/ — public UI (Vercel), proxies /api/* here.
• arcadia-stresstest/ — two-chain load tester.
• arcadia-contracts/ — Celo (celo/) + Stacks (stacks/) contract source.