The essential APIs that empower merchants to automate, optimise, and scale their e-commerce business.

E-commerce in 2025 is API-first. From Shopify to BigCommerce, Adobe Commerce, Amazon, and other platforms, merchants rely on APIs to connect tools, automate workflows, and drive growth. Understanding which APIs matter is critical for maximising efficiency, personalisation, and revenue.

Here’s a breakdown of the top 50 APIs every merchant should know, organised by category.

1. E-Commerce Platform APIs

  1. Shopify Admin API – Manage products, orders, customers, and themes.
  2. BigCommerce API – Access product catalog, orders, pricing, and inventory.
  3. Adobe Commerce (Magento) API – Integrate with products, sales, and customer data.
  4. WooCommerce REST API – For WordPress-based stores.
  5. Salesforce Commerce API – Enterprise e-commerce automation.
  6. Squarespace Commerce API – Product and order management.
  7. Wix Stores API – Automate Wix store operations.

2. Payment & Checkout APIs

  1. Stripe API – Payment processing and subscriptions.
  2. PayPal REST API – Payment, invoicing, and payouts.
  3. Square API – Payments, POS, and inventory.
  4. Adyen API – Enterprise payment gateway.
  5. Braintree API – Payment processing and vaulting.
  6. Apple Pay API – Mobile payments.
  7. Google Pay API – Mobile and web checkout.

3. Shipping & Fulfilment APIs

  1. ShipStation API – Shipping label creation and order tracking.
  2. ShippyPro API – Carrier selection and automated shipping.
  3. Shippo API – Multi-carrier shipping and tracking.
  4. UPS API – Shipping, rates, and tracking.
  5. FedEx API – Shipping rates, labels, and tracking.
  6. DHL API – Logistics and tracking.
  7. Amazon Fulfilment API – FBA inventory and orders.

4. Marketplace APIs

  1. Amazon Selling Partner API – Product listing, orders, and ads.
  2. eBay RESTful API – Inventory, orders, and marketing.
  3. Etsy API – Product and order management.
  4. Walmart Marketplace API – Product, inventory, and order management.
  5. Rakuten API – Store management and order tracking.
  6. Newegg API – Listings and sales management.

5. Marketing & Advertising APIs

  1. Google Ads API – Campaign creation and optimisation.
  2. Facebook Marketing API – Ads, targeting, and reporting.
  3. Instagram Graph API – Content scheduling and analytics.
  4. TikTok for Business API – Ad campaigns and reporting.
  5. Mailchimp API – Email campaigns, automation, and lists.
  6. HubSpot Marketing API – Lead management and email automation.
  7. Klaviyo API – E-commerce marketing automation.
  8. ActiveCampaign API – Email, automation, and CRM integration.

6. Analytics & Insights APIs

  1. Google Analytics 4 API – Track user behaviour, events, and conversions.
  2. Google Tag Manager API – Tag deployment and updates.
  3. Mixpanel API – Event tracking and analytics.
  4. Amplitude API – Behavioural analytics for products.
  5. Looker API – Business intelligence and dashboards.
  6. Power BI REST API – Analytics automation and reporting.

7. SEO & Content APIs

  1. Ahrefs API – Keyword, backlink, and competitor analysis.
  2. SEMRush API – SEO and PPC insights.
  3. Screaming Frog API – SEO crawling and analysis.
  4. Surfer SEO API – Content optimisation and keyword analysis.
  5. OpenAI GPT API – Content generation for product descriptions and blogs.

8. Social & Customer Engagement APIs

  1. Zendesk API – Customer support automation.
  2. Freshdesk API – Support ticket and workflow management.
  3. Intercom API – Chat, messaging, and customer engagement.
  4. Twilio API – SMS, WhatsApp, and voice communications.

Why These APIs Matter

  • Automation: Reduce repetitive manual work for product management, marketing, and fulfilment.
  • Integration: Connect multiple platforms for seamless operations.
  • Scalability: Support thousands of products, campaigns, and customers.
  • Personalisation: Deliver tailored experiences using AI insights and data.
  • Efficiency: Faster updates, reporting, and decision-making across platforms.

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