Zinc

Zinc is an e-commerce API covering the full purchasing lifecycle — discovery, ordering, tracking, returns — across thousands of retailers including Amazon, Best Buy, Walmart, Target and Alibaba, with 20M+ orders placed through it. Instead of building and maintaining an integration per retailer, developers get one interface: search catalogs, place orders, monitor delivery, and generate return labels programmatically, with metadata, variant mapping, price caps, shipping rules, webhooks and a unified order dashboard on top.

This is exactly the layer that shopping agents need — an AI assistant that "buys it for you" is only as good as its ability to actually complete checkout and handle a return, and Zinc has been quietly processing that problem at scale for years. (Note: the contact email on file came from a partner listing; use the site's own contact page for sales.)

Who it's for: developers building shopping agents, procurement automation, or any product where "order this programmatically" is a feature. Pricing is usage-based and enterprise-leaning — worth a demo if agent-driven purchasing is on your roadmap, because the retailer-integration maintenance alone will eat your quarter.