{"protocolVersion":"2025-06-18","serverInfo":{"name":"email-check","title":"Agent Email Check","version":"1.0.0"},"capabilities":{"tools":{"listChanged":false}},"transport":{"type":"http","endpoint":"https://mailcheck.netzhandwerker.de/mcp","methods":["POST"]},"payment":{"protocol":"x402","network":"eip155:8453","asset":"USDC","note":"tools/list needs no payment. email_check costs 0.001 USDC, email_check_batch 0.0006 USDC per address."},"verdicts":{"deliverable":"The mail server accepted this recipient and the domain is not catch-all. Only reachable with an SMTP probe.","undeliverable":"The mail server rejected this recipient permanently.","invalid":"The address cannot receive mail: broken syntax, no MX and no A record, or a null MX record.","risky":"A mail route exists, but a concrete negative signal is attached: disposable provider, catch-all domain or a likely typo.","unknown":"A mail route exists and nothing is known about this specific mailbox. This is the honest default without an SMTP probe."},"tools":[{"name":"email_check","description":"Check one email address: syntax, mail route, MX hosts, disposable provider, role account, typo suggestion, catch-all estimate, and a verdict with a confidence between 0 and 1. Never claims a mailbox exists without evidence; the honest default for a routable address is \"unknown\". 0.001 USDC per call over x402.","inputSchema":{"type":"object","required":["email"],"properties":{"email":{"type":"string","description":"The email address to check."},"smtp_check":{"type":"boolean","default":false,"description":"Ask for an optional SMTP probe. Off by default, heavily throttled, one attempt per target and never retried. Without it the verdict of a routable address stays \"unknown\"."}}}},{"name":"email_check_batch","description":"Check up to 100 email addresses in one paid call. Billed 0.0006 USDC per address; the 402 quotes the exact amount for the addresses in the request. One DNS lookup per distinct domain, cached 24 hours.","inputSchema":{"type":"object","required":["emails"],"properties":{"emails":{"type":"array","minItems":1,"maxItems":100,"items":{"type":"string"},"description":"Between 1 and 100 addresses. Billed at 0.0006 USDC per address with a 0.001 USDC minimum charge."},"smtp_check":{"type":"boolean","default":false,"description":"Ask for an optional SMTP probe. Off by default, heavily throttled, one attempt per target and never retried. Without it the verdict of a routable address stays \"unknown\"."}}}}]}