Precious-Metals Token Sale and Settlement

Project: RWA Token Sale and Purchasing Applications

Situation

The project needed to connect precious-metals token purchases to bank-transfer settlement while keeping pricing, wallet delivery, liquidity, and administrative operations consistent.

Task

Build focused services and application flows for token exchange, payment initiation, transaction monitoring, and settlement.

Action

Connected bank-transfer settlement to token release after confirmed payment receipt
Added pricing locks to prevent drift during a purchase
Supported NNN and NVM exchange flows using current product prices from the backoffice API
Monitored BSC transactions through BscScan over a bounded waiting period
Added pending, successful, and failed transaction states with timeout handling
Added Redis caching for frequently requested product prices
Connected credit-card signup to backoffice user data and transaction status

Result

Created a token-sale workflow with explicit transaction lifecycles, current pricing, payment verification, and blockchain settlement monitoring.

Technologies

NestJS, TypeScript, Node.js, MongoDB, Redis, JWT, BscScan API, REST, cron jobs, Jest, Supertest