{"uid":"cap_39poSsl2_TKlO799bzEab","slug":"synthora-email-verification-4a0be871","name":"SYNTHORA Email Verification","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://api.hergertsynthora.com/v1/mailcheck","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"email":{"type":"string","description":"Email address to verify"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_s3kgCapwFg5e7kXIwwp8S","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies whether an email address is real and safe to send to, checking syntax, MX records, disposable domains, catch-all status, role accounts, and common typos, returning a deliverability status and confidence score.","exampleAgentPrompt":"Can you check if john.doe@example.com is a real, deliverable email address — I want to know if it's disposable, a catch-all, or has any typos before I add it to my mailing list?","exampleUseCases":[{"title":"Pre-send contact validation for CRM","prompt":"Before I import this lead into the CRM, can you verify that sarah.jones@acmecorp.com is a real deliverable email and not a role address or disposable inbox?"},{"title":"Bulk email list bounce prevention","prompt":"I'm about to send a campaign — can you check if marketing@startup.io is safe to email, and tell me if it's catch-all or has any MX record issues?"},{"title":"Sign-up form fraud detection","prompt":"A user just signed up with the email temp4521@mailinator.com — is this a real address or a throwaway, and should I block the registration?"}],"resultDescription":"Returns a deliverability status (e.g. valid, invalid, risky, unknown), a confidence score, and detailed flags including: RFC syntax validity, MX record existence, catch-all domain status, disposable/temporary domain detection, role account detection (info@, admin@, etc.), free provider identification, and common typo suggestions. Response is Ed25519-signed for tamper-proof verification.","failureModes":["Missing or malformed email input returns a validation error","Domains with no public MX records may return unknown status rather than invalid","Catch-all domains cannot confirm individual mailbox existence, reducing confidence score","Rate limiting or wallet exhaustion after free tier may block calls","Temporary DNS lookup failures may cause transient unknown results","Extremely new or obscure TLDs may not be fully covered"],"whenToPreferThis":"Choose this endpoint when you need fast, deterministic email deliverability checks with cryptographically signed results. Ideal for pre-send validation, CRM enrichment, sign-up fraud prevention, and email list hygiene. Particularly valuable when you need disposable domain detection and role account flagging alongside standard syntax and MX checks. The Ed25519-signed response is useful when auditability of validation results matters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:57:46.225Z","isFirstParty":false}