payclawBlockchainCryptocurrencyWeb3 & Decentralized TechTeaBayAlicense-qualityBmaintenanceDrop-in x402 payment middleware for MCP servers. Charge AI agents per tool call using USDC on Base chain — Python and JavaScript SDKs, no payment processor, no KYC. Updated 3 months ago (2026-05-09 16:55 UTC)MIT