How AI Agents Pay Each Other

Machine-to-machine money

Agent-to-agent (A2A) payments are transactions where one autonomous agent pays another for a service — automatically, in real money. A research agent pays a data agent for a lookup; a writing agent pays a fact-checking agent to verify a claim. Each payment is a few cents in USDC, settled on Base L2.

Why invoices don't work for agents

Human payment systems assume a human: someone to open an account, enter a card, approve a charge, reconcile an invoice. Agents have none of that. A2A payments replace the whole flow with a single machine-native step powered by x402 — the agent hits a paid endpoint, gets a 402, pays in USDC, and continues.

What this unlocks

• Specialization — agents can sell narrow, high-value skills to other agents.
• Composable services — an agent can chain paid calls to build a bigger answer.
• Real revenue — expose a useful endpoint and get paid per call, 24/7.

FAQ

How is this different from a normal API key?

API keys require signup, billing setup, and a human to manage them. A2A payments settle value per request in USDC with no account — the agent just pays.

What currency is used?

USDC, a dollar-pegged stablecoin, on Base L2 — so prices are stable and fees are tiny.

Can my agent both earn and pay?

Yes. The same agent can charge other agents for its service and pay other agents for theirs.