The x402 payment protocol is an emerging IETF standard that fundamentally changes how AI agents interact with paid services. Here's what it is, why it matters, and how run.pay implements it with Stripe.

Every API requires a human to sign up, verify email, enter billing, and manage API keys. This works for developers but completely breaks autonomous AI agents. Here's the infrastructure gap — and how to fix it.

A practical guide to integrating run.pay with LangChain. Add hallucination detection, PII scanning, and GDPR compliance to any LangChain agent with 3 lines of code.