x402 Tester
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x402 Insights

Exploring the intersection of HTTP standards, blockchain payments, and autonomous agents.

December 1, 2025

The Ultimate Guide to HTTP 402 Payment Required

Explore the history of the "reserved for future use" status code and how it is finally finding its purpose in the age of crypto and AI.

HTTP StandardsWeb HistoryProtocol
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December 2, 2025

Building the Agentic Economy with x402

How autonomous AI agents will buy, sell, and trade resources using standardized payment protocols, creating a new layer of the digital economy.

AI AgentsM2MFuture Tech
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December 3, 2025

The Machine-Payable Web: A New Era for APIs

Moving beyond subscriptions: How HTTP 402 and crypto payments enable a true machine-to-machine economy for APIs and AI agents.

API EconomyMicro-paymentsDeveloper Tools
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December 4, 2025

Designing AI Agents That Pay for APIs Using HTTP 402

A technical guide on architecting AI agents that can autonomously negotiate and pay for API access using the request-pay-retry pattern.

Agent ArchitectureTutorialCode
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December 4, 2025

Building Multi-Agent Economies: How to Combine Identity, Trust and Payments with x402

Explore how to design guaranteed multi-agent ecosystems with ledger-anchored identities, reputation networks, and x402 micropayments.

Multi-Agent SystemsIdentityReputation
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x402 Tester

An open-source tool to demonstrate and test the x402 payment protocol. Enabling agentic payments, micropayments, and frictionless API monetization using HTTP 402.

Resources

  • About Protocol
  • Implementation Guide
  • FAQ
  • Official Docs

Use Cases

  • AI Agents
  • Pay-per-Call API
  • Content Paywalls

© 2025 x402 Tester. Built for the Agentic Web.