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Guides to the agentic-commerce stack: what it is, how it works, and how AgentCash fits in.
MCP Payments: Paid Tools for AI Agents
MCP payments are per-call, stablecoin-settled charges attached to tools exposed through the Model Context Protocol, so an AI agent can pay for a tool invocation with no API keys or vendor signup.
Read guidePay-Per-Call APIs: Why AI Agents Need Them
A pay-per-call API charges for each individual request instead of a subscription or per-seat plan. Cost scales linearly with usage, which fits AI agents that call services in unpredictable bursts.
Read guidePayments for AI Agents: Wallets, x402 and Real Costs
Payments for AI agents let autonomous software pay for API calls without a human. The agent holds a balance, discovers a price, and pays per call in USDC.
Read guideWhat Are API Micropayments?
API micropayments are sub-dollar payments settled per individual API call, from fractions of a cent to under a dollar, on low-cost chains. They are what card rails cannot do below a dollar.
Read guideWhat Is Agentic Commerce? A Practitioner's Guide
Agentic commerce is economic activity where AI agents discover, price, and pay for digital services on their own, no human checkout. The buyer is software and settlement is on-chain in stablecoins.
Read guideWhat Is MPP? The Machine Payments Protocol for AI Agents
MPP is the Machine Payments Protocol, built by Stripe and Tempo, that lets an AI agent authorize once and pay across stablecoins, cards and more. Here's what MPP is and how it compares to x402.
Read guideWhat Is an AI Agent Wallet? How Agents Hold and Spend
An AI agent wallet is a developer-controlled USDC wallet an autonomous agent uses to pay for APIs and tools on its own, within limits you set. No UI, no confirmation dialogs.
Read guideWhat Is x402? The Open Payment Protocol for AI Agents
x402 is the open protocol, built by Coinbase, that revives HTTP 402 so an AI agent can pay for an API call in USDC. Here's what it is, who governs it, and how it compares to MPP.
Read guideLooking for a specific API?
Browse the directory of payment-protected APIs your AI agent can call through AgentCash.
API Directory for AI Agents →