Verifiable Usage Accounting for Internet of Agents

This document describes a usage accounting and evidence framework for the Internet of Agents (IoA). In cross-domain agent collaboration, agents may attach to gateways, discover capabilities, delegate subtasks, invoke tools, consume model or compute resources, and produce auditable outcomes. Existing application logs or platform- specific billing interfaces are insufficient for interoperable accounting across agents, gateways, and administrative domains. This document defines requirements and a common object model for verifiable usage accounting, including Accounting Contexts, Metering Profiles, Measurement Dimensions, Usage Event Records, and Accounting Evidence References. These objects are intended to support interoperable recording, correlation, export, verification, correction, and dispute handling for agent collaboration events. This document does not define pricing, charging policy, token issuance, financial settlement, revenue-sharing rules, invoices, or business support system interfaces. It focuses on protocol-visible accounting records and evidence objects that may be used by other systems.