Glossary

The vocabulary of
agent payments.

Short, plain-English definitions for the concepts behind charging agents per call: x402, MCP monetization, settlement, and USDC on Base. Each term links to the docs and pages where it shows up.

Monetization

MCP Monetization

MCP monetization is the practice of adding a per-call payment gate to Model Context Protocol tool registrations so that AI agents pay before the tool handler runs.

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Protocol

x402

x402 is an open, HTTP-native payment protocol that lets any server charge any client per request using HTTP status code 402 (Payment Required).

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The vocabulary ofagent payments.

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The vocabulary of
agent payments.