Allium(@AlliumLabs):x402 revives an HTTP status code that sat unused since the 1990s: 402 Payment Required. An API can answer a request by asking for payment, and a machine can settle it with no card, no account, and nobody approving it. Small protocol change, large consequences for how agents buy data. Our explainer on how it works.

Allium

@AlliumLabs

Building the system of record for onchain finance. Trusted by Coinbase, Visa, Phantom, MetaMask, and Uniswap. Cited by the Federal Reserve.

Joined March 2022

155 Following 15.1K Followers

Allium@AlliumLabs

2026.08.21 13:00

x402 revives an HTTP status code that sat unused since the 1990s: 402 Payment Required. An API can answer a request by asking for payment, and a machine can settle it with no card, no account, and nobody approving it. Small protocol change, large consequences for how agents buy data. Our explainer on how it works.