x402 payment protocol enabling AI agents to autonomously pay for APIs on Arbitrum. Features Sperax USDs stablecoin with auto-yield, payment channels for streaming micropayments, on-chain subscriptions, and a tool registry marketplace. Includes TypeScript SDK, Express middleware, and upgradeable smart contracts.
Last updated Mar 25, 2026
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Attention Score
40
Language breakdown
TypeScript 61.6%
Solidity 36.8%
PLpgSQL 0.8%
JavaScript 0.5%
Dockerfile 0.3%
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