Multi-Chain Wallet Transaction Listener

Watches wallet addresses across chains and triggers services on confirmed transactions.

Role: Senior backend developer

The challenge

Downstream services needed to react the moment funds reached specific wallets — on four different networks, each with its own confirmation semantics.

The solution

A detection service that monitors chosen addresses on Ethereum, Bitcoin, BSC and Polygon, waits for confirmations and calls downstream APIs, running in Docker with Prometheus metrics.

What was built

Address watch-lists across Ethereum, Bitcoin, BSC and Polygon
Confirmation-aware triggering of downstream service APIs
Dockerised deployment with Prometheus observability

Outcome

Downstream services react to on-chain payments automatically

Technology

Node.js, PostgreSQL, Docker, Prometheus, Web3 RPC, AWS EC2

Case study by Shahfayaz Khan.