Rye

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Universal checkout API that lets AI agents buy products from any merchant programmatically — the "buy anything" layer for agentic commerce.

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Our take

A universal checkout API that lets AI agents purchase from virtually any merchant programmatically — the 'buy anything' rail for agentic commerce, backed by a 14M-dollar raise.

Best for

Developers building shopping or procurement agents that need to actually complete purchases, not just recommend.

Pros

One API to buy across many merchants
Purpose-built for AI agents, not human checkout
Well-funded and an Agentic Commerce Consortium member
Handles the messy merchant-integration layer for you

Cons

Early-stage; coverage and reliability still maturing
Usage-based pricing is not fully transparent upfront
Requires engineering to integrate

How it compares

Versus Firmly, Rye is the agent-side 'buy' API, where Firmly is the merchant-side connector that exposes a store to agents.

Full review

Rye provides a single API that lets an AI agent buy products from a wide range of merchants programmatically, abstracting away the per-merchant checkout integrations that would otherwise make autonomous purchasing impractical.

It is purpose-built for agents rather than human shoppers and has raised around 14 million dollars, but it is still early — merchant coverage, pricing transparency and reliability are all evolving, and you will need engineering effort to wire it in.