No fluff. This article walks through how to build a stable, deep and extensible data pipeline across platforms—canonical schema, API design, anti-bot & observability, ETL & analytics, common pitfalls and code you can actually run.

Contents

1. Why a single multi-platform API
2. Supported platforms and key differences
3. Canonical schema: Product/Listing/Offer/Seller/Review/AdSlot
4. API design: endpoints, params, paging, idempotency and caching
5. Anti-bot, observability and data quality
6. ETL and analytics: normalization, variant aggregation, FX conversion, brand/category mapping
7. Code examples
8. Metrics and dashboards
9. Case study: same air fryer across three platforms
10. FAQ and compliance

1. Why a single multi-platform API

Cross-platform operations are noisy: different structures, different rhythms. Scripts break; manual work doesn’t scale. We want one pipeline that’s uniform, controllable, extensible and rollback-friendly.

• Uniform: one API handles search/listing/detail/reviews/ad slots across platforms.
• Controllable: rate limiting, retries, caching, degradation and canary in config, not hardcoded.
• Extensible: adding a platform means adding mappings and an adapter, not rewriting the downstream.
• Rollback-friendly: versioned adapters and quick rollback when signals drift.

2. Supported platforms & differences

• Amazon: ASIN, complex variants, BuyBox & Sponsored signals, deep categories.
• Walmart: itemId/SKU, mixed 1P/3P, list vs detail field differences, ads vary.
• Shopee: composite item_id + shop_id, price ranges & promo, shop-level signals matter.
• Lazada: SPU/SKU, heavy promos/coupons, category trees differ by site.
• Tokopedia: shop-rich signals, region/logistics affect exposure, review pagination quirks.
• eBay: Item ID, auction vs buy-now, clear Listing vs Offer boundary.
• AliExpress: frequent platform promos, translation impacts matching, review geo distribution useful.
• Mercado Libre: LATAM, multiple currencies & taxonomies, seller reputation model differs.
• Etsy: handmade/custom, attributes irregular, images/copy more critical.
• Rakuten/Flipkart: strong localization, search/sort differs from US/EU platforms.
• Temu: fast-changing page structures; heavy promo-driven low-price strategy; require cautious adapter canary.
• Jumia: Africa regions; logistics/stock volatility strongly impact conversion; category mapping needs local nuance.
• Noon: Middle East; Arabic/English bilingual; currencies and taxes must be cleanly modeled.
• Daraz: South Asia; promo-heavy with shop-weight; review logic similar to SEA but details differ.
• Kaufland/Otto/Allegro: DE/PL local platforms; EAN/GTIN matching matters; descriptions are structured but badges vary.
• Bol.com: NL local; brand aggregation pages common; mind merged listings across sellers (identify and split correctly).

Strategy: ship Amazon/Walmart/Shopee first; then expand regionally—SEA (Lazada/Tokopedia), US/EU (eBay/AliExpress), LATAM (Mercado Libre).

3. Canonical schema

• Product: cross-platform product dimension (title/brand/images/attributes/gtin).
• Listing: platform exposure & ranking (platform, category_path, rank_position, badges, is_sponsored).
• Offer: price/stock snapshots (price, currency, original_price, availability, stock, timestamp).
• Seller: shop/seller info (seller_id, seller_name, rating, store_metrics).
• Review: rating & review counts, recency, breakdown.
• AdSlot: ad slots and signals (slot_type, confidence, evidence text/icon/aria/css/context).

Keep fast-changing signals (variants, prices, ad slots) out of Product; store them as separate entities for history and comparability.

New: deep category examples (Appliances, Women’s Apparel, Mother & Baby, Small Appliances, Power Tools)

Categories behave differently. Use the canonical skeleton and map category-specific attributes carefully.

Appliances (fridge/washer/microwave)

• Key attributes: brand, capacity (L), energy rating, dimensions (L×W×H), inverter, warranty.
• Variants: color/capacity; Amazon/Walmart aggregate variants better; SEA platforms sometimes split variants into separate listings.
• Mapping: Product.attributes.capacity_l, energy_rating; normalize units to cm.
• Analysis: price index by capacity bands; stock volatility and replenishment speed as quality proxies; extract review keywords: noise/energy/after-sales.

Women’s Apparel (dress)

• Key attributes: size (US/EU/ASIA), color, material, fit, season tags.
• Variants: size × color; avoid platforms merging multiple designs under one SKU.
• Mapping: attributes.size_standard, attributes.material; normalize colors to a standard palette.
• Analysis: returns-related reviews are sensitive (size/quality); ad slots impact rankings more directly in apparel; strong seasonality—use time windows.

Mother & Baby (strollers/formula)

• Key attributes: age/weight range, standards (EN/ASTM), formula type, safety certifications.
• Variants: pack size/color; mind regional regulations for formula claims.
• Mapping: attributes.age_range, attributes.safety_cert; preserve certification codes in cleaned text.
• Analysis: review stability and negative review control matter; stock gaps strongly affect rank recovery.

Small Appliances (air fryer/blender)

• Key attributes: capacity (L), power (W), coating type, preset modes.
• Variants: capacity and color; promos are strong—analyze price elasticity with promo badges.
• Mapping: attributes.capacity_l, attributes.power_w; normalize feature keywords (airfry/bake/grill).
• Analysis: review keywords “coating/odor/cleanability”; split SoV into organic vs ads.

Power Tools (drills/grinders)

• Key attributes: power/voltage, chuck size, RPM range, brushless, accessories list.
• Variants: battery capacity/bundle size; same SPU may split into multiple listings across platforms.
• Mapping: attributes.voltage_v, attributes.rpm, attributes.brushless.
• Analysis: spec-driven segment; price correlates with accessory bundles; extract “durability/battery/heat” from reviews.

Engineering tip: namespace category-specific attributes under Product.attributes (e.g., appliance.*, fashion.*, baby.*, tools.*) to keep generic fields clean.

4. API design

{
  "endpoint": "/v1/scrape",
  "method": "POST",
  "request": {
    "platform": "amazon|walmart|shopee|lazada|tokopedia|ebay|aliexpress|ml|etsy|rakuten|flipkart",
    "intent": "search|listing|product_detail|offers|reviews|ads",
    "query": "air fryer",
    "region": "US|SG|ID|MY|PH|TH|VN|BR|MX|JP|EU",
    "language": "en|zh|id|ms|es|pt|jp",
    "page": 1,
    "page_size": 24,
    "options": { "wait_render": true, "include_ads": true, "include_seller": true, "timeout_ms": 30000 }
  },
  "response": {
    "items": [ { /* Canonical fields */ } ],
    "meta": { "page": 1, "page_size": 24, "total": 500, "trace_id": "..." },
    "cache": { "hit": false, "ttl": 60 }
  }
}

• Paging: unify page/page_size. Convert cursor-based paging to this format.
• Idempotency: within TTL, same query+region+intent returns consistent results. Support idempotency-key.
• Caching: short TTL for hot queries & details; avoid long caching for reviews/ads.
• Canary: adapter versions roll out gradually; quick rollback on anomalies.

5. Anti-bot, observability & quality

• Fingerprint pool: diversify IP/UA/screen/timezone; human-like pacing.
• Render waits: use wait_for_selector and fallbacks for delayed signals (Sponsored, badges).
• Retry & degrade: fast retries; degrade to low-precision parsing or cached snapshots on persistent failures.
• Coverage & accuracy: target ≥95% overall, ≥98% for core queries; multi-signal ad detection with confidence & evidence.
• Metrics: latency, error rate, timeouts, retry counts, cache hit rate, freshness—on dashboards and alerts.

6. ETL & analytics

• Extract: concurrent queues per platform/intent; rate-limited; retry with backoff.
• Transform: mapping, category/brand normalization, FX conversion, variant aggregation, text cleaning.
• Load: warehouse partitions by platform/date; Bronze/Silver/Gold layers for raw/cleaned/curated.

Variant tip: don’t average prices across color/size. Keep main SKU and price deltas by variant—much more useful for elasticity analysis.

7. Code examples

Python: async concurrency

import asyncio, aiohttp

API_BASE = "https://api.example.com"
API_KEY = "YOUR_API_KEY"

async def scrape(session, payload):
    async with session.post(f"{API_BASE}/v1/scrape", json=payload, headers={
        "Authorization": f"Bearer {API_KEY}",
        "Content-Type": "application/json"
    }) as resp:
        if resp.status != 200:
            raise RuntimeError(f"HTTP {resp.status}")
        return await resp.json()

async def main():
    queries = [
        {"platform": "walmart", "intent": "search", "query": "air fryer", "region": "US", "language": "en"},
        {"platform": "shopee", "intent": "product_detail", "item_id": 123456789, "shop_id": 987654321, "region": "SG", "language": "en"},
        {"platform": "lazada", "intent": "search", "query": "air fryer", "region": "SG", "language": "en"}
    ]
    async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=30)) as session:
        tasks = [scrape(session, q) for q in queries]
        results = await asyncio.gather(*tasks, return_exceptions=True)
        for r in results:
            print(type(r), str(r)[:200])

asyncio.run(main())

Node.js: streaming & dedupe

import fetch from "node-fetch";

const API_BASE = "https://api.example.com";
const API_KEY = process.env.API_KEY;

async function scrape(body) {
  const resp = await fetch(`${API_BASE}/v1/scrape`, {
    method: "POST",
    headers: { "Authorization": `Bearer ${API_KEY}`, "Content-Type": "application/json" },
    body: JSON.stringify(body)
  });
  if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
  return await resp.json();
}

function dedupe(items) {
  const seen = new Set();
  return items.filter(x => {
    const key = `${x.platform}:${x.global_id}`;
    if (seen.has(key)) return false; seen.add(key); return true;
  });
}

const walmart = await scrape({ platform: "walmart", intent: "search", query: "air fryer", region: "US", language: "en", options: { include_ads: true } });
const shopee = await scrape({ platform: "shopee", intent: "product_detail", item_id: 123456789, shop_id: 987654321, region: "SG", language: "en" });

const merged = dedupe([...(walmart.items||[]), shopee]);
console.log(merged.slice(0, 3));

Walmart ad-slot snippet

{
  "items": [
    {
      "global_id": "walmart:itemId:123456",
      "platform": "walmart",
      "title": "Air Fryer Pro",
      "is_sponsored": true,
      "adslot": {
        "slot_type": "search_top",
        "confidence": 0.93,
        "evidence": { "text": "Sponsored", "aria": "sponsored", "css": ".ad-badge" }
      }
    }
  ]
}

8. Metrics & dashboards

• Price Index: median, quantiles, promo share by platform/category.
• Availability Volatility: stock-outs and replenishment speed by day/week.
• Share of Voice: brand exposure & ad-share across search listings.
• Listing Velocity: new listings and rank lift; spot rising stars and fading SKUs.

9. Case study: the same air fryer across three platforms

Pick a comparable SKU (e.g., 4L air fryer). Pull top-N search and details from Amazon/Walmart/Shopee. Then:

1. Price & promos: Amazon promo-heavy; Walmart steadier prices; Shopee wide promo-driven ranges.
2. Ads & ranking: Amazon Sponsored dense at the top; Walmart ads more discrete; Shopee shop-weighted rankings.
3. Reviews & conversion: review volume and recent growth beat single-point ratings as conversion proxies.

With the canonical schema, stitch all three and make a simple call: main push on Amazon; price strategy follows Walmart median; Shopee wins via promo pricing and shop exposure. Decisions backed by data—not gut feel.

10. FAQ & compliance

• Don’t over-scrape: rate-limit, cache and respect platform ToS; use public product data only.
• Variants: don’t mix variant prices; avoid treating child SKUs as separate products when comparing.
• Multilingual: regex + dictionaries; don’t rely on English-only “Sponsored”.
• Rollback: versioned adapters, canary rollout, automatic degrade on anomalies, on-call playbooks.

For enterprise-grade onboarding (platform list, quotas, regional configs), contact us. We ship region- and category-specific solutions.

Keywords: Multi-Platform Data Collection API · Walmart Data Scraping API · Shopee Data Collection Tool · Lazada · Tokopedia · eBay · AliExpress · Mercado Libre · Etsy · Rakuten · Flipkart

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