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Production case study · Fintech

Kobbopay — Multi-Rail Crypto Payment Platform

A production payment platform supporting TRON, BSC, and Ethereum USDT with merchant and admin portals, treasury tooling, webhooks, and monitored settlement flows.

Project type

Production payment platform

Industry

Fintech · Crypto payments

Technology

NestJS · PostgreSQL · Redis · Multi-chain USDT

Deployment model

Cloud-hosted API · Merchant & admin portals

Technology stack

NestJSPostgreSQLRedisTRON USDTBSC USDTETH USDTWebhooksTreasury

System architecture

End-to-end payment path from merchant integration to settlement

Merchant

Checkout, API keys, and webhook endpoints

→

API

NestJS services, auth, and transaction state

→

Wallet Infrastructure

Unique deposit addresses per payment intent

→

Blockchain

TRON, BSC, and Ethereum USDT monitoring

→

Treasury

Inbound flow tracking and balance segregation

→

Settlement

Merchant-available balances and withdrawals

Supported networks

TRON (TRC20)BNB Smart Chain (BEP20)Ethereum (ERC20)

Core capabilities

  • Unique deposit addresses
  • Automatic payment detection
  • Confirmation tracking
  • Merchant balances
  • Treasury management
  • Withdrawals
  • Webhooks
  • Admin controls

Security & reliability

  • Multi-network validation before crediting merchant balances
  • Confirmation thresholds configured per rail and risk profile
  • Operational monitoring for stuck deposits and webhook failures
  • Withdrawal controls with approval steps for high-risk actions
  • Treasury separation between inbound flows and payout queues

Development stack

NestJS
TypeScript
PostgreSQL
Redis
Nginx
TRON
BSC
Ethereum

Challenges solved

  • Unified USDT acceptance across three chains without three separate merchant integrations
  • Reliable webhook delivery with idempotency and operator-visible retry logs
  • Ledger-style transaction states that support reconciliation and support investigations
  • Admin tooling for treasury review without direct database intervention
  • Decoupling chain listeners from core API latency under webhook fan-out load

Engineering lessons

  • Payment platforms benefit from explicit state machines — implicit balance updates create support debt
  • Chain adapters should isolate RPC and confirmation logic so new rails do not rewrite core domains
  • Merchant and admin portals should share API contracts but never share permission models
  • Treasury operations need first-class UI — spreadsheets do not scale with webhook volume

Project Overview

Kobbopay is a multi-rail crypto payment platform designed for merchants who need USDT acceptance across TRON, BSC, and Ethereum without operating separate integrations for each chain.

DEWEB engineered merchant-facing checkout flows, an operations admin portal, and backend services that coordinate deposits, confirmations, treasury movements, and merchant withdrawals with auditable state transitions.

Business Problem

Merchants needed a unified way to accept USDT across chains while keeping treasury control, reconciliation, and payout rules in one system — not three disconnected wallets and spreadsheets.

  • Fragmented chain integrations increased engineering and ops overhead
  • Manual reconciliation slowed merchant payouts and support response
  • Webhook reliability and idempotency were required for production integrations
  • Admin visibility into transactions, settlements, and exceptions was essential

Outcome

Kobbopay ships as a unified merchant payment stack across three USDT rails with operational tooling for treasury, settlements, and support — built for production monitoring rather than demo-only flows.

The architecture supports adding rails and merchant integrations without rewriting the core ledger and webhook domains.

Engineering documentation

Selected repositories and technical notes referenced in this case study.

View documentation↗

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