Version 0.1.0 of XEP-0518 (Payment Required) has been released. Abstract: This specification defines an XMPP protocol extension that enables services to require payment before granting access to a resource. It provides a payment-system-neutral invoice format built on payment URIs (such as the RFC 8905 payto scheme), supporting multiple concurrent payment options, from bank transfers to transfers over distributed ledgers or instant-settlement networks, and integrates with the existing CAPTCHA challenge mechanism defined in XEP-0158. Changelog: Accepted as Experimental by council vote on 2026-07-07 (XEP Editor (dg)) URL: https://xmpp.org/extensions/xep-0518.html Note: The information in the XEP list at https://xmpp.org/extensions/ is updated by a separate automated process and may be stale at the time this email is sent. The XEP documents linked herein are up-to- date.