Accepting agent payments on your API: the x402 seller's guide
Accepting agent payments on your API: the x402 seller's guide You run an API that generates code reviews, transforms images, runs inference, or scrapes data. Your users are starting to call it from AI agents, not just browsers. And those agents have wallets. They can pay per call. But your payment form is a credit card field that no agent can fill. The HTTP 402 status code was designed for…
The article "Accepting agent payments on your API: the x402 seller's guide" explains how to accept payments from AI agents that call your API directly, rather than through a browser. The solution revolves around the HTTP 402 status code, which was designed for payment challenges. When an agent calls your API, your server returns a 402 response with a payment challenge containing details like the recipient address, amount, and token type.
The agent then pays through its CAI wallet, and upon successful settlement, the agent retries the original request with a proof of payment. The guide outlines the four-step seller-side process and details the two-step paying-agent-side process using CAI's MCP toolset.
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