I built a 58-tool MCP server where AI agents pay per call in USDC — here's how

For the past few weeks I've been building Yantrix — an agent-native API network where every tool call costs fractions of a cent in USDC, settled automatically on Base mainnet via x402. Today it hit 58 tools and I want to share what I learned. What is x402? x402 is an emerging standard that revives the HTTP 402 "Payment Required" status code. When an agent calls a paid endpoint without payment, it gets back a 402 with instructions on how to pay. An x402-enabled client automatically signs a USDC microtransaction and retries — no credit cards, no API key billing, no invoices. The economics: $0.001 per call. Agents can autonomously consume APIs and pay for them. No human in the loop. What Yantrix covers The 58 tools span 7 service groups: Crypto — real-time price, trading signals, deep analysis, AI reports Finance — stocks, company profiles, financials, forex, market overview Web Extract — clean text, metadata, contacts, PDF, structured data, AI summaries India Business — GST lookup, MCA21