{"uid":"cap_6NdLhN1NWd78fRopiGthM","slug":"agent-email-check-single-address-236fa689","name":"Agent Email Check (Single Address)","description":"DNS and list based verification. Never claims that a mailbox exists without evidence: without an SMTP probe the verdict for a routable address is \"unknown\", not \"valid\".","url":"https://mailcheck.netzhandwerker.de/email","method":"POST","headers":{},"bodySchema":{"type":"object","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\"."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_t7zFBT2j5OkvUUJYlpr-z","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates a single email address using DNS and blocklist checks, with an optional SMTP probe for definitive deliverability verdicts.","exampleAgentPrompt":"Can you check whether john.doe@example.com is a valid, deliverable email address — run the full SMTP probe so I get a definitive answer, not just 'unknown'?","exampleUseCases":[{"title":"Pre-send lead validation","prompt":"Before I import this lead into my CRM, check if sarah.jones@acmecorp.com is actually deliverable — use the SMTP probe so I know for sure it's not just a routable domain with no real mailbox."},{"title":"Sign-up form abuse prevention","prompt":"A user just entered support@tempmail.org on our registration form — can you verify whether that email address is real and not on any blocklists?"},{"title":"Bounce risk check before campaign","prompt":"I'm about to send a newsletter to newsletter@bigclient.com — do a DNS and SMTP check on it first so I can remove it if it's going to bounce."}],"resultDescription":"Returns a verdict for the email address — either 'valid', 'invalid', or 'unknown' (if no SMTP probe was run on a routable domain) — along with DNS resolution status, blocklist match information, and whether the domain is routable. Without smtp_check=true, a routable address that hasn't been probed returns 'unknown' rather than 'valid'.","failureModes":["Invalid email format returns an error or invalid verdict immediately","SMTP probe throttled or unavailable for the target domain — verdict stays 'unknown'","Domain does not exist in DNS — returns invalid","Temporary DNS resolution failure may produce uncertain results","SMTP check is one-attempt-only and never retried, so transient errors yield 'unknown' not 'valid'"],"whenToPreferThis":"Use this endpoint when you need fast, conservative email verification for a single address and want to avoid false positives — it explicitly returns 'unknown' rather than guessing 'valid' without evidence. Prefer it over bulk endpoints when checking a single address at a time, and enable smtp_check=true only when a definitive deliverability answer is required and the slight latency and throttling are acceptable.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:39:16.589Z","isFirstParty":false}