Supplier and vendor risk score for any company domain. Returns a 0-100 stability score, risk tier, and named risk flags, with subsignals: domain age and expiry (WHOIS), TLS certificate status, DNS health (A/MX/SPF/DMARC), and 30-day news sentiment. Use for supplier due diligence before purchasing from, integrating with, or paying an unfamiliar vendor or counterparty. Call GET /supplier-risk?domain=acme.com. JSON response, no API key, $0.15 USDC per request via x402.