Marketplace Price Tracker

JavaScript client for the Marketplace Price Tracker API on RapidAPI.

Search and compare prices across 14+ online marketplaces from a single API: OfferUp, Reverb, TCGPlayer, StubHub, Swappa, Poshmark, Craigslist, Grailed, Bonanza, and more.

Install

npm install marketplace-price-tracker

Quick Start

const MarketplacePriceTracker = require('marketplace-price-tracker');

const tracker = new MarketplacePriceTracker('YOUR_RAPIDAPI_KEY');

// Search TCGPlayer for Pokemon cards
const cards = await tracker.tcgplayer('charizard vmax', { limit: 10 });

// Search Reverb for guitars
const guitars = await tracker.reverb('fender stratocaster', { limit: 20 });

// Search OfferUp locally
const deals = await tracker.offerup('macbook pro', { location: 'new york' });

// Search any marketplace generically
const results = await tracker.search('swappa', { query: 'iphone 15', limit: 10 });

// Compare prices across marketplaces
for (const market of ['offerup', 'swappa', 'craigslist']) {
  const res = await tracker.search(market, { query: 'ps5' });
  console.log(`${market}: ${res.results?.length} listings`);
}

Supported Marketplaces

| Marketplace | Method | Best For | |-------------|--------|----------| | TCGPlayer | tcgplayer(query) | Trading cards (Pokemon, MTG, Yu-Gi-Oh) | | Reverb | reverb(query) | Music gear (guitars, amps, pedals) | | OfferUp | offerup(query) | Local marketplace deals | | StubHub | stubhub(query) | Event tickets | | Swappa | swappa(query) | Used electronics | | Poshmark | poshmark(query) | Fashion & accessories | | Craigslist | craigslist(city, category, query) | Local classifieds | | Grailed | grailed(query) | Designer/streetwear | | Bonanza | bonanza(query) | General marketplace | | Goodreads | search('goodreads', ...) | Books | | AbeBooks | search('abebooks', ...) | Rare/used books | | ThriftBooks | search('thriftbooks', ...) | Used books | | Houzz | search('houzz', ...) | Home design | | Redfin | search('redfin', ...) | Real estate |

Additional Endpoints

homeServices(service, location)

Get cost estimates for home services (plumbing, electrical, etc.).

estateSales(location, options?)

Find estate sales near a location.

storage(location, options?)

Compare self-storage facility pricing.

Use Cases

• Arbitrage: Find price discrepancies across marketplaces
• Price Monitoring: Track product prices over time
• Market Research: Compare pricing across platforms
• Deal Alerts: Build notification systems for price drops
• E-commerce Tools: Power price comparison features

Get Your API Key

1. Go to Marketplace Price API on RapidAPI
2. Subscribe (free tier: 200 requests/month)
3. Copy your API key from the dashboard

License

MIT