{"protocolVersion": "0.3.0", "name": "Verify whether an email address is real and safe to send to. Checks RFC syntax, live MX re", "description": "Verify whether an email address is real and safe to send to. Checks RFC syntax, live MX records, catch-all and disposable/temporary domains, role accounts (info@, admin@), free providers and common typos, returning a deliverability status and confidence score. Use it to validate and enrich contacts, clean email lists and prevent bounces. Deterministic, Ed25519-signed. 0.001 USDC on Base. First 3 calls FREE per wallet — send header 'X-WALLET: 0x<your Base address>' (no payment); then  per call.", "url": "https://mailcheck.hergertsynthora.com/service", "preferredTransport": "HTTP+JSON", "additionalInterfaces": [{"url": "https://mailcheck.hergertsynthora.com/service", "transport": "HTTP+JSON"}, {"url": "https://mailcheck.hergertsynthora.com/a2a", "transport": "JSONRPC"}], "version": "1.0.0", "provider": {"organization": "HERGERT SYNTHORA", "url": "https://hergertsynthora.com"}, "capabilities": {"streaming": false, "pushNotifications": false, "stateTransitionHistory": false}, "defaultInputModes": ["application/json"], "defaultOutputModes": ["application/json"], "skills": [{"id": "mailcheck", "name": "mailcheck", "description": "Verify whether an email address is real and safe to send to. Checks RFC syntax, live MX records, catch-all and disposable/temporary domains, role accounts (info@, admin@), free providers and common typos, returning a deliverability status and confidence score. Use it to validate and enrich contacts, clean email lists and prevent bounces. Deterministic, Ed25519-signed. 0.001 USDC on Base. First 3 calls FREE per wallet — send header 'X-WALLET: 0x<your Base address>' (no payment); then  per call.", "tags": ["mailcheck", "x402", "synthora", "m2m", "a2a"], "examples": ["{\"email\": \"user@example.com\"}"], "inputModes": ["application/json"], "outputModes": ["application/json"], "inputSchema": {"type": "object", "properties": {"email": {"type": "string", "description": "Email address to verify"}}, "required": ["email"]}}], "securitySchemes": {"x402": {"type": "http", "scheme": "x402", "description": "HTTP 402 micropayment. 1000 atomic USDC on eip155:8453."}}, "security": [{"x402": []}], "x402": {"network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "amount": "1000", "payTo": "0x10800a5a5B9d72251566EC651E862A8b4B427dE0", "resource": "https://mailcheck.hergertsynthora.com/service"}, "mcp": {"endpoint": "https://mailcheck.hergertsynthora.com/mcp", "transport": "http-jsonrpc"}}