x402 Protocol Skill Protocol Overview x402 embeds stablecoin payments into HTTP by using the 402 "Payment Required" status code. A server responds with payment requirements; the client signs a payment authorization, resubmits the request, and gets the resource after verification and settlement. Payment flow: 1. Client sends HTTP request → Server returns + header (base64 JSON) 2. Client reads requirements, creates signed payment payload 3. Client resubmits request with header (base64 JSON) 4. Server verifies payment via facilitator 5. Server performs work, settles via facilitator 6. Server ret…