CrossKit ERP - Multi-Tenant Cross-Border E-Commerce SaaS (Vue 3 + FastAPI)

CrossKit ERP - Multi-Tenant Cross-Border E-Commerce SaaS (Full Source Code)

CrossKit ERP is a complete, production-oriented source code package for launching a multi-tenant SaaS ERP for cross-border e-commerce sellers. It brings multi-platform shops, orders, products and SKUs, inventory and warehouse, logistics, procurement, finance and profit analytics, marketing, customer service and subscription billing together in one codebase - delivered with a modern Vue 3 admin panel, a FastAPI REST backend, and a built-in marketing website, blog/CMS and pricing pages.

This is NOT a UI kit and not a single-module demo. It is a full-stack business system: 38 API route modules, 290+ REST endpoints, 56 database tables and 35 front-end routes. Ship it as your own SaaS product, run it as an in-house ERP, or use it as the foundation for client projects serving Amazon, Shopify, eBay and 1688 merchants.

WHAT MAKES IT DIFFERENT

- True multi-tenancy - shared database with tenant_id isolation enforced by middleware on every query, JWT authentication, role permissions, operation logs and plan gating (Free / Basic / Professional).

- Real marketplace integrations - Amazon SP-API (LWA OAuth, order sync, FBA inventory, reports), Shopify Admin API with OAuth + webhooks, an eBay adapter, and 1688/Alibaba sourcing with signed API requests and price comparison.

- A profit engine, not just reports - SKU-level profit calculation with FBA fees, marketplace commission, first-leg freight allocation, tariff / VAT / import cost, finance expenses and incremental sync.

- SaaS monetization built in - PayPal Orders API and Creem subscription checkout, webhooks, upgrade orders, plan limits, plus a public landing site, pricing page, lead capture forms, customer cases and a bilingual blog CMS.

- Operational depth - WMS with warehouses, wave shipments, FBA shipments and low-stock alerts; single and batch PDF shipping labels; carrier rate comparison; Kuaidi100 / Cainiao tracking; a customer-service inbox with AI auto-reply and review management; advertising ROI analysis; AI listing optimization, sales forecasting and anomaly scanning with an acknowledge/resolve workflow.

MODULES INCLUDED

Operations dashboard & KPI analytics | Multi-shop management | Order management (filters, batch operations, sync, status flow) | Product & SKU catalogue | Inventory & multi-warehouse WMS | Shipments & shipping labels | Logistics channels & tracking | 1688 smart sourcing & suppliers | Purchase plans, purchase orders & quality checks | Product collection & one-click publishing | SKU profit & finance | Advertising ROI | Customer service & reviews | Distribution | AI listing optimizer, forecasting & anomaly detection | Reports & CSV/JSON export | Users, roles & operation logs | Blog/CMS & multilingual (zh-CN / en-US) | Subscriptions, PayPal/Creem billing | WebSocket real-time notifications | System monitoring & settings.

TECH STACK

Frontend: Vue 3.4, Element Plus 2.6, Vite 4, Pinia 2, Vue Router 4, Axios, ECharts 5, vue-i18n, SCSS.

Backend: Python 3.11+, FastAPI 0.110, SQLAlchemy 2.0, Alembic 1.13, Pydantic 2.5, Celery 5.3, Redis client 5, Uvicorn / Gunicorn, JWT (python-jose), bcrypt / passlib.

Database: MySQL 8.0+ (SQLite works for local development and the test suite), Redis 7 as cache and Celery broker.

DevOps: Dockerfile, docker-compose (web + Celery worker + Celery beat + Redis), Nginx config, SQL init scripts, index optimization script and a step-by-step deployment guide.

WHAT YOU GET

- Complete frontend and backend source code - readable, unobfuscated, no compiled binaries

- SQLAlchemy models, Alembic migrations, database init and index optimization scripts

- Auto-generated Swagger UI (/docs) and ReDoc (/redoc) API documentation

- Docker Compose deployment, Nginx configuration and deployment guide

- Test scripts and 13 markdown documentation files

- Free support via email [CUSTOMIZE: state your support period and policy]

REQUIREMENTS AND HONEST NOTES

- Python 3.11+, Node.js 18+, MySQL 8.0+ (or SQLite for a local demo), Redis 7+.

- Third-party API credentials (Amazon SP-API, Shopify, 1688, PayPal / Creem, carriers) are supplied by you. All integration code and configuration screens are included; no vendor credentials are bundled.

- AI features ship with deterministic template fallbacks (LLM disabled by default); connect your own LLM provider through environment configuration for generated copy and forecasting.

- Exports are CSV and JSON (the Excel option falls back to CSV). i18n currently ships zh-CN and en-US only. Taobao collection and translated scraped listings are stubs.

- Screenshots and the live preview use representative sample data. No real merchant data is included.