---
title: "Discussion on \"x402 and the propose-confirm pattern: how AI agents pay for API calls without a credit card\" | Hashnode"
description: "Discussion on \"x402 and the propose-confirm pattern: how AI agents pay for API calls without a credit card\". The HTTP 402 status code has been in the spec since 1992. Until now, no one built a standard way to actually use it for payments.\nx402 is CAI Labs' implementation of HTTP 402 Payment Required for AI a"
url: "https://hashnode.com/posts/x402-and-the-propose-confirm-pattern-how-ai-agents-pay-for-api-calls-without-a-credit-card/6a8e8db3fd4b327ae3eebdc3"
---

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# [x402 and the propose-confirm pattern: how AI agents pay for API calls without a credit card](https://cailab.hashnode.dev/x402-and-the-propose-confirm-pattern-how-ai-agents-pay-for-api-calls-without-a-credit-card?utm_source=hashnode&utm_medium=feed)

The HTTP 402 status code has been in the spec since 1992. Until now, no one built a standard way to actually use it for payments. x402 is CAI Labs' implementation of HTTP 402 Payment Required for AI a

Aug 26 · 4 min read · cailab.hashnode.dev  
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## Written by

[Cai](https://hashnode.com/@cailab)

@cailab · Hong Kong, China

  
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## Responses 1

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[Muhammad Atif](https://hashnode.com/@fita84)

[Aug 27](https://hashnode.com/posts/x402-and-the-propose-confirm-pattern-how-ai-agents-pay-for-api-calls-without-a-credit-card/6a8e8db3fd4b327ae3eebdc3/comment/6a8ffe70ee90444926341a3f)

This is a compelling implementation of HTTP 402 for the agent economy. The propose-confirm split, spending mandates, and isolated signing keys make autonomous payments far more practical and secure.