render.yaml

# Render deployment for the SLAB indexer.
#
# Only the indexer is hosted here. It must be a long-lived process — it holds the rebuilt book
# state in memory and polls the chain head — so it cannot run on a serverless platform. The web
# app goes to Vercel (see vercel.json); the contracts are already on-chain; the maker is a script
# you run locally during a demo, not a service.
services:
  - type: web
    name: slab-indexer
    runtime: node
    # `free` is a valid Blueprint plan value; `starter` is not in Render's accepted list at all.
    # Free web services SPIN DOWN after 15 minutes without inbound traffic, and this service keeps
    # the rebuilt order book in memory — so a spin-down means a full re-sync on the next request,
    # visible as a blank wall for ~60s. Fine for development; for a live demo either upgrade to a
    # paid instance or keep it warm by pinging /ping every ~10 minutes (cheap: does no state work).
    plan: free
    rootDir: indexer
    buildCommand: npm ci
    startCommand: npx tsx src/index.ts
    healthCheckPath: /ping
    envVars:
      # Fast endpoint for reads and tip-following.
      - key: MONAD_TESTNET_RPC
        sync: false        # set in the Render dashboard; may contain an API key
      # SEPARATE endpoint for historical backfill, and this split is deliberate:
      # the public RPC allows a 100-block eth_getLogs range where Alchemy's free tier allows 10,
      # so backfill is ~6x faster on the public one despite its higher per-request latency.
      - key: LOGS_RPC
        value: https://testnet-rpc.monad.xyz
      - key: PORT
        value: "8080"
      # Skip pre-deployment history. This is the block the current OrderBook was deployed in;
      # update it whenever you redeploy the contracts.
      - key: START_BLOCK
        value: "57867851"