x402 is an emerging crypto-native payment protocol for AI agents, inspired by HTTP 402 Payment Required, that lets two agents settle a micropayment trustlessly before a response is returned.
Last verified: April 2026
What is x402 Protocol?
x402 is an emerging crypto-native payment protocol for AI agents, inspired by HTTP 402 Payment Required, that lets two agents settle a micropayment trustlessly before a response is returned.
Named after the long-dormant HTTP status code 402, x402 lets a service agent respond to a request with a payment challenge that the calling agent can satisfy programmatically. AGNT uses x402 for metered booking confirmations on its roadmap, settling on USDC over Base L2 so that fees stay well below the value of a restaurant reservation.
FAQ
x402 Protocol FAQ.
Common questions about x402 Protocol in the AGNT platform.
x402 is an emerging crypto-native payment protocol for AI agents, inspired by HTTP 402 Payment Required, that lets two agents settle a micropayment trustlessly before a response is returned.
People also ask.
Related terms
Metered Billing
Metered billing is AGNT's per-use pricing model for API consumers — each booking.confirm call costs $0.25, batched nightly to Stripe as usage records with no upfront fees.
Commerce Ledger
The Commerce Ledger is AGNT's financial log, recording every booking fee as gross, platform net, and venue net, linked to its Stripe payment reference.
OpenClaw Protocol
OpenClaw is an open protocol for agent-to-agent commerce, defining envelope shapes, intent vocabulary, and trust primitives that any platform can implement.
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What is x402 Protocol? x402 is an emerging crypto-native payment protocol for AI agents, inspired by HTTP 402 Payment Required, that lets two agents settle a micropayment trustlessly before a response is returned. https://agntdot.com/glossary/x402
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See it in action.
Now you know what x402 Protocol means. Try the live scan demo or read the developer docs to go deeper.