SaaS · Social-to-Store Commerce

OPNMRT

A commerce engine for sellers who run their business in WhatsApp and Instagram DMs. In about five minutes they get a branded store, a proper checkout paid straight to their bank with 0% commission, and BigT, an AI assistant that reads their live sales, stock and orders.

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Category: Commerce Engine for Independent Sellers
Status: Live
Core stack: Next.js, NestJS, PostgreSQL, Prisma
Live at: opnmrt.com

opnmrt.com

Platform commission

Customers pay sellers directly; the platform takes no cut

~5 min

Sign-up to live store

A shareable store link the moment the account is created

Flat plan

Pricing

One monthly subscription with every feature, instead of a cut of every sale

01The challenge

Thousands of independent sellers run their whole business in chat apps: answering "how much?" all day, chasing transfer screenshots and keeping stock counts in their heads. The marketplaces that offer an alternative take a slice of every sale and keep the customer relationship for themselves.

02The approach

OPNMRT moves the selling into a real store and keeps the conversation. Each seller gets an isolated storefront on their own .opnmrt.com link or custom domain, customers pay at checkout straight into the seller's bank, and one flat monthly plan replaces commission. BigT, the built-in AI store manager, is connected to live store data and writes listings from product photos, summarises sales and profit, and warns before stock runs out.

03What I built

The pieces that make it work.

01Self-Serve Onboarding

A Store, Live in Minutes

Pick a store name and the link is live immediately; themes, logo, colours, custom domains, unlimited products, reviews and fast mobile checkout come built in.

02Direct Settlement

Paid Straight to the Seller

Sellers connect their own Paystack or Flutterwave account, so customers pay at checkout and funds settle to the seller's bank. The platform never holds the money and takes 0% of sales.

03AI Commerce

BigT, the AI Store Manager

Connected to the store's live revenue, orders and inventory: listings written from a product photo, daily sales and profit summaries, restock alerts, 30-day forecasts and marketing ideas.

04Seller Operations

Operations Built In

Delivery handshake codes so orders are only marked delivered on confirmation, low-stock alerts, invoices, VAT on orders, customer accounts, buyer messaging and verified reviews.

05Multi-Tenancy

Isolated Store Data

One platform serves every seller with tenant-level data isolation, so each store's customers, orders and numbers stay private to that seller.

04Inside the product

Real screens, in production.

Seller homepage“Stop selling in DMs” — a branded store, proper checkout and an AI assistant.

DMs versus a real storeThe pain of selling in chat apps, next to a clean checkout paid straight to the seller.

Everything in one planStorefront, direct payments, delivery handshake codes, analytics and stock alerts.

BigT, the AI store managerAn assistant connected to live store data: listings from photos, restock alerts and forecasts.

Mobile homepageThe new storefront pitch on a phone.

05Architecture

How it's put together.

01
Frontend Storefront
Next.js App Router (apps/web)
Dynamic SSR storefronts rendering product catalogues with React Query server state, Zustand client state, and Radix UI / Framer Motion aesthetics.
- Next.js
- React Query
- Zustand
- Tailwind CSS
- Framer Motion
02
Backend Microservices
NestJS Domain-Driven Architecture (apps/api)
Segmented REST API (Public, Seller, Buyer, Admin) with Redis Pub/Sub events (ORDER_CREATED, STOCK_UPDATED) and Socket.IO WebSockets.
- NestJS
- Node.js
- TypeScript
- Socket.IO
- Redis Pub/Sub
03
Shared Workspaces
@opnmrt/shared Package (packages/shared)
Unified TypeScript interfaces, Zod validation schemas, and currency utilities shared seamlessly across web and api workspace packages.
- pnpm Workspaces
- TypeScript
- Zod
04
Database Layer
PostgreSQL & Prisma Multi-Tenant Schema
Enforces strict row-level tenant isolation using tenant foreign keys, backed by Redis session caching and rate-limiting.
- PostgreSQL
- Prisma ORM
- Redis

06Stack decisions

Every tool earns its place.

Next.js

Framework

Storefronts, seller dashboard and marketing site

Fast server-rendered storefronts with per-store domains and strong SEO for every seller.

NestJS

Framework

Modular API backend

Clear domain modules for orders, payments, inventory and logistics, with WebSocket events.

PostgreSQL

Database

Multi-tenant data store

Transactional integrity for orders and stock when many stores sell at once.

Prisma

ORM

Type-safe, tenant-scoped data access

Keeps every query scoped to the right store.

Paystack & Flutterwave

Payments

Direct settlement to sellers

Card, transfer and mobile money paid into the seller's own account, with no platform escrow.

Gemini

BigT store assistant

Turns a product photo into a listing and answers questions from the store's real numbers.

Socket.IO

Real-time

Order events and buyer messaging

Live order updates and buyer-seller conversations inside the store.

07Engineering notes

Decisions worth writing down.

Designed around how sellers already sell

Most sellers start in DMs, so the product doesn't fight chat: the store link goes in the bio and Status, and the conversation continues while checkout, payment and stock tracking happen in the store.

One engine, separate storefronts

Subdomains and custom domains resolve to the right store at request time, so a single deployment serves every seller.

Never hold the seller's money

The platform handles carts, orders and records without sitting between sellers and their revenue, which removes a whole class of payout and trust problems.

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