x402 on @Solana turned into a full payment stack over the past year. Payment Channels is the newest piece - letting an agent spend a budget for a whole task instead of paying per call. The infrastructure is real. Adoption is still open.

x402 payment on Dataline is officially live. 🚀 Agent installs MCP, connects wallet, invokes x402, pays per call in USDC, gets live BTC price. No API key, no subscription, no human in the loop. The agent paid, the agent got data. Try it:

x402 is bringing a new class of activity to the XRP Ledger. Earlier this month in Seoul, we brought together builders exploring agent payments, AI infrastructure, and new financial applications on XRPL. A look back at x402 on XRPL: AI Builders Night Korea 🇰🇷

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.

x402 vs MPP, explained. x402 and MPP both revive an http status code that sat dormant since 1997. each one standardizes a different slice of the same flow. x402, built by @coinbase, settles every request onchain with stablecoins. an agent hits a 402, signs a USDC payment on @base or @solana, retries, and receives the resource. no processing fees beyond gas make it the efficient rail for high frequency machine to machine calls. MPP, from @stripe and @tempo, generalizes the 402 pattern into a rail agnostic framework. its session primitive lets an agent preauthorize a spending limit and stream micropayments without an onchain transaction per interaction. cards, stablecoins, and any future method plug into one negotiation flow. MPP clients can even consume existing x402 services without changes. the two protocols are production ready, and serious agent platforms will end up speaking both. each spec ends its job at settlement, and governance begins right above that line. which agent spent what, under whose authority, against which policy, with what audit trail. payment rails standardize how money moves between machines. controls determine whether a given payment should happen at all.