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Guides

Tutorials and deep dives on APIs, agentic commerce, and integrations.

Guides

8/4/2026

10 AI Shopping Prompts for Zinc API

Copy 10 Zinc API agent prompts to search retailers, place orders with max price caps, and track delivery. Includes hands-free checkout with Universal Checkout.

How to Automate Corporate Gifting With an API

Guides

8/4/2026

How to Automate Corporate Gifting With an API

Compare corporate gifting APIs and learn how to automate physical gifts, address collection, ordering, spend controls, tracking, and delivery.

Agentic Commerce in 2026: Where We Stand & What's Next

Guides

7/23/2026

Agentic Commerce in 2026: Where We Stand & What's Next

AI agents are buying products for humans now. Learn the state of agentic commerce in 2026 and get 5 steps to optimize your online store for machine buyers.

How to Buy Products Online with AI: APIs, Agents & MCP (2026)

Guides

7/16/2026

How to Buy Products Online with AI: APIs, Agents & MCP (2026)

Learn how AI agents buy physical products online — from ChatGPT-style prompts to purchasing APIs, MCP skills, and production checkout with Zinc.

Best MCP Servers for Retail & Online Shopping (2026)

Guides

7/15/2026

Best MCP Servers for Retail & Online Shopping (2026)

Compare MCP servers that help AI agents search products, place orders, and manage retail workflows — including Zinc Universal Checkout, Shopify, and open-source options.

Shipment Tracking API for Developers: Polling, Webhooks, and Multi-Retailer Tracking (2026)

Guides

7/8/2026

Shipment Tracking API for Developers: Polling, Webhooks, and Multi-Retailer Tracking (2026)

Developer guide to shipment tracking APIs: poll orders, handle webhooks, normalize checkpoints, and track shipments across Amazon, Walmart, and 50+ retailers with Zinc.

7 Best Ecommerce Purchasing APIs for Developers (2026)

Guides

7/7/2026

7 Best Ecommerce Purchasing APIs for Developers (2026)

Compare the best ecommerce purchasing APIs for developers. See which platforms place real orders vs seller-only tools, plus how to choose the right stack for AI agents and procurement.

10 Best Returns Management Software for Ecommerce (2026)

Guides

7/7/2026

10 Best Returns Management Software for Ecommerce (2026)

Compare 10 returns management platforms for ecommerce in 2026. Loop, Narvar, ReturnGO, AfterShip, and more ranked by API depth and use case. See the list.

Procurement Automation API: Build Internal Buying Workflows

Guides

7/7/2026

Procurement Automation API: Build Internal Buying Workflows

Learn how a procurement automation API automates retail order placement when platforms like Spendflo and Zapier stop at checkout. Build your workflow.

Web Scraping vs Ecommerce API: Data and Buying (2026)

Guides

7/7/2026

Web Scraping vs Ecommerce API: Data and Buying (2026)

Compare web scraping vs ecommerce APIs for product data, checkout, and order tracking. Learn when scraping fits and when you need a purchasing API.

How to Build an AI Shopping Agent: Step-by-Step Guide

Guides

4/16/2026

How to Build an AI Shopping Agent: Step-by-Step Guide

Build an AI shopping agent that actually completes purchases, not just suggests them. Full walkthrough with Claude, MCP tools, Zinc for order execution, and MPP for payments.

What Is HTTP 402 Payment Required? A Complete Guide

Guides

4/16/2026

What Is HTTP 402 Payment Required? A Complete Guide

HTTP 402 was reserved in 1997 and unused for 30 years. Here's the history, the current revival via x402 and MPP, and why it's becoming the foundation of agentic commerce.

MPP vs x402: Which Agent Payment Protocol to Use?

Guides

4/16/2026

MPP vs x402: Which Agent Payment Protocol to Use?

MPP (Stripe + Tempo) and x402 (Coinbase) both revive HTTP 402 for agent payments. Here is a technical comparison and when to use each, with code.

What Is ACP? The Agentic Commerce Protocol Explained

Guides

4/16/2026

What Is ACP? The Agentic Commerce Protocol Explained

ACP is the open protocol for agent-to-merchant checkout from Stripe and OpenAI. Here's how it works, its four endpoints, Shared Payment Tokens, and what it can't do.

What Is AP2? The Agent Payments Protocol Explained

Guides

4/16/2026

What Is AP2? The Agent Payments Protocol Explained

AP2 is Google's open protocol for authorizing AI agent payments with cryptographically signed mandates. Here's how it works, its three mandate types, and when to use it.

What Is MPP? A Developer's Guide to Machine Payments

Guides

4/16/2026

What Is MPP? A Developer's Guide to Machine Payments

MPP lets AI agents pay for anything over HTTP without an account. Here's how the Machine Payments Protocol actually works, how it compares to x402 and ACP, and real production code.

Amazon Shopping API Guide: Programmatic Buying (2026)

Guides

3/16/2026

Amazon Shopping API Guide: Programmatic Buying (2026)

No public Amazon buy API. Compare SP-API, PA-API, and Buy with Prime, plus how developers place orders programmatically. Explore the guide.

Walmart Shopping API: The Ultimate Guide to Programmatic Buying (2026)

Guides

3/16/2026

Walmart Shopping API: The Ultimate Guide to Programmatic Buying (2026)

Everything you need to know about Walmart APIs, their limitations for developers, and how to use Zinc as a complete Walmart Shopping API.

Multi-Product Ordering API: Order Multiple SKUs Across Retailers at Scale

Guides

1/19/2026

Multi-Product Ordering API: Order Multiple SKUs Across Retailers at Scale

Order multiple products with quantities in a single API request. Multi-SKU checkout across Amazon, Walmart, Target, and 50+ retailers with Zinc.