Automating Uniswap V3 Liquidity with Node.js Lambda

Over the past year at BoxExchanger I have been building an automated liquidity system that keeps Uniswap V3 positions profitable without a human on-call for every price move.

Architecture

• Watcher Lambda listens to pool swaps and triggers rebalances when volatility exceeds a configurable delta.
• Planner service computes the optimal tick ranges using historic volatility bands and pool depth sensitivity.
• Executor signs and submits transactions through a custodial signer, broadcasting safe fallback instructions when gas spikes.

Lessons Learned

1. Deterministic math beats ad-hoc heuristics—encode everything as pure functions and keep floating point out of smart-contract facing code.
2. Telemetry-first meant we could see ROI drifts in Grafana and course-correct before LPs felt pain.
3. Simulation harnesses that replay the last 72h of swaps saved countless incidents.

Next up: exposing LP performance snapshots via a lightweight GraphQL API.