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.
x402-stablecoin is an early-stage TypeScript project in the AI payments / x402 ecosystem, focused on agent, crypto, cryptocurrency, decentralized. It currently has 12 GitHub stars and 2 forks, and sits alongside related tools like x402-stablecoin, sperax-crypto-mcp, wolfpack-sdk.
💰 Streamline payments for AI agents using HTTP 402 with yield-bearing Sperax USDs on Arbitrum for fast, cost-effective transactions.
MCP server and plugin for Sperax Protocol – USDs, SPA, veSPA & Demeter on Arbitrum and BNB Chain. Listed on Anthropic's official MCP Registry.
On-chain security and market intelligence for AI agents on Base — 14 services via x402, MCP, A2A, and ACP. EIP-712 signed attestations.