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Reference Library

Topics

Evergreen reference pages on the protocols, legislation, and infrastructure shaping autonomous agent commerce.

Protocol
x402 Protocol

The HTTP 402-based payment standard that lets AI agents pay for API access autonomously. Covers the 4-step payment cycle, implementers (Coinbase, Cloudflare, AWS, Stripe, Circle, Vercel), relationship to MCP, and Linux Foundation governance.

x402 protocol HTTP payments AI agents x402 payment standard
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MCP Payments

How payment tools work in the Model Context Protocol: tool call to x402 to facilitator to response. Which MCP servers support x402 today (AurelianFlo, Coinbase, Cloudflare, Apify, Civic), and what a paid tool call looks like end-to-end.

MCP payments Model Context Protocol payment tools AI agent payments MCP
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GENIUS Act Stablecoin

The first US federal stablecoin law, signed July 2025. Key requirements: 1:1 reserve backing, KYC/AML, OFAC compliance, issuer licensing. Covers the FinCEN/OFAC NPRM under Docket FINCEN-2026-0100 and implications for x402 payment flows.

GENIUS Act stablecoin stablecoin regulation 2026 GENIUS Act compliance
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Agent-to-Agent Payments

How AI agents pay each other without human approval: x402 for stablecoin settlement, Visa TAP and Mastercard AP4M for card rail authentication, Google A2A for inter-agent communication, and MCP tool calls for payment orchestration. Current production examples.

agent-to-agent payments AI agent commerce autonomous agent payment protocol
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