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Evergreen references for the agentic-commerce stack — what it is, how it works, and how AgentCash fits in.

What Is x402? The Protocol That Makes HTTP 402 Payment Required Real

x402 revives HTTP 402 Payment Required as a real stablecoin payment protocol. Learn the handshake, MCP integration, and how AI agents use it.

payments for ai agents

Payments for AI Agents: How to Let Your Agent Pay for Any API

Payments for AI agents let autonomous software pay per API call using USDC and x402. Learn how stablecoin rails replace API keys and subscriptions.

pay per call api

Pay Per Call API: What It Is and Why AI Agents Need It

Pay per call API pricing lets AI agents pay only for the requests they make. Learn how per-call billing compares to subscriptions and how to get started.

mcp payments

MCP Payments: Adding Pay-Per-Call Billing to MCP Tool Servers

MCP payments let AI agents pay for tool calls with USDC over the x402 protocol. Learn how payment gates work inside MCP servers for Claude and Cursor.

api micropayments

API Micropayments: Per-Call Stablecoin Payments for AI Agent Workflows

API micropayments let AI agents pay fractions of a cent per call with USDC stablecoins over x402. Learn why they work and how to start.

ai agent wallet

AI Agent Wallet: Give Your Agent a Stablecoin Balance It Can Spend

An ai agent wallet lets autonomous agents pay for APIs using one USDC balance. Learn self-custody vs managed wallets, spending caps, and setup.

agentic commerce

Agentic Commerce: What It Means for AI Agents to Transact on Their Own

Agentic commerce lets AI agents purchase data, compute, and services with USDC over x402. Learn what it is, how it works, and how to build for it.

Looking for a specific API?

Browse the directory of payment-protected APIs your AI agent can call through AgentCash.

API Directory for AI Agents →