Building a Cross-Border Price Monitoring API — Free Tier Available (100 req/day)

[rock2089]

Building a Cross-Border Price Monitoring API

If you do cross-border e-commerce or flipping, you know the pain — manually checking prices across platforms is a grind. So I built an API for it.

TL;DR: I built PricePulse, a free REST API that monitors product prices across Carousell SG, Amazon SG, Lazada, and Vinted. Free tier: 100 requests/day.

Tech Stack

• Backend: Python + FastAPI
• Payments: PayPal (Node.js)
• Deployment: nginx + Cloudflare Tunnel
• Data: 5,755+ products across 3 marketplaces
• Pricing: Free 100/day, Pro $10/mo, Enterprise $50/mo

Quick Start

import requests

resp = requests.get(
    "https://incl-coupons-question-pair.trycloudflare.com/search",
    params={"q": "iPhone 15", "source": "carousell"},
    headers={"X-API-Key": "***"}
)
print(resp.json())

Features

• Real-time search across Carousell SG, Amazon SG, Vinted
• Trending products and price history
• Cross-platform arbitrage detection
• Category browsing
• REST API with clean JSON responses

Pricing

Plan	Price	Daily Limit
Free	$0	100 req/day
Pro	$10/mo	1,000 req/day
Enterprise	$50/mo	10,000 req/day

Get Started

👉 Get your free API key
📖 Full documentation
📝 Read the blog post
⭐ GitHub repo