Twenty-six pay-per-call agent micro-services at agentx.sale, listed in the catalogue and settled on-chain via x402 (USDC on Base + Solana) or the IETF Machine Payments Protocol (MPP): crypto ticker / gas / Fear&Greed, weather, site health, security headers check, KEV/CVE check & SEO, full Polymarket toolkit, email deliverability, FX rates, Bitcoin fees, WebMCP tools, x402 Doctor, AI classify & keywords. Cards accepted via Stripe on premium routes. MCP: free catalogue + x402 Doctor.