Loading...
HTTP-Native Micropayments (x402)
An open payment standard created by Coinbase in 2025 and now stewarded by the x402 Foundation under the Linux Foundation that revives the dormant HTTP 402 Payment Required status as a pay-per-request rail. A server replies 402 with machine-readable payment requirements; the client (human or agent) returns a signed stablecoin payment in an HTTP header; a facilitator verifies the payload and settles the transfer on-chain (EVM chains, Solana, and more), all inside a single request with no accounts, sessions, or API keys. It is a native rail for keyless, sub-cent agent-to-service micropayments and metered tool or data access, and is the crypto profile referenced by the AP2 A2A-x402 extension. Distinct from `agentic-commerce-protocol`: ACP is card-based retail checkout through a merchant of record, whereas x402 is a per-call machine payment settled on-chain.
Loading technique guide…
HTTP-Native Micropayments (x402)
An open payment standard created by Coinbase in 2025 and now stewarded by the x402 Foundation under the Linux Foundation that revives the dormant HTTP 402 Payment Required status as a pay-per-request rail. A server replies 402 with machine-readable payment requirements; the client (human or agent) returns a signed stablecoin payment in an HTTP header; a facilitator verifies the payload and settles the transfer on-chain (EVM chains, Solana, and more), all inside a single request with no accounts, sessions, or API keys. It is a native rail for keyless, sub-cent agent-to-service micropayments and metered tool or data access, and is the crypto profile referenced by the AP2 A2A-x402 extension. Distinct from `agentic-commerce-protocol`: ACP is card-based retail checkout through a merchant of record, whereas x402 is a per-call machine payment settled on-chain.
Loading technique guide…