HTTP 402 is Alive: How Stripe's Machine Payments Protocol Fixes API Key Hell Stripe and Tempo just activated HTTP 402 with the Machine Payments Protocol, letting AI agents pay for 183 API endpoints autonomously. Here is why it changes everything. By Anwar Sheikh, Co-Founder of OutGrow. Published March 19, 2026. Tags: AI, Automation, API, Stripe, Web3. Read the full article at https://www.letsoutgrow.com/blog/http-402-stripe-machine-payments-protocol.