Glossary
Key terms and protocols for AI infrastructure, agent commerce, and verifiable receipts.
PEAC Protocol
Policy, Evidence, Access, Compliance
Open protocol for file-based policy discovery and verifiable receipts.
HTTP 402
Payment Required
HTTP status code for machine-payable API access and agent payments.
x402
HTTP 402 Payment Extension
Stablecoin-backed HTTP 402 payments with structured challenge-response.
A2A
Agent-to-Agent
Protocol for AI agents to transact and verify interactions with each other.
MCP
Model Context Protocol
Protocol for connecting AI models to external tools and data sources.
AIPREF
AI Preferences
Machine-readable AI usage preferences for crawling, training, and inference.
ACP
Agentic Commerce Protocol
Framework for AI agents to discover, negotiate, and complete transactions.
Agentic Web
Agent-First Internet
Infrastructure layer where AI agents interact, transact, and verify autonomously.