{"uid":"cap_f6kvB1crR-mfRERIhTl25","slug":"agentshelf-syntexa-ch-email-rfc-syntax-validator-14cc3d85","name":"agentshelf.syntexa.ch Email RFC Syntax Validator","description":"Call when an agent needs whether an email address has a usable syntax. No mailbox lookup. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/check-email-rfc first.","url":"https://agentshelf.syntexa.ch/v1/check-email-rfc?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"data":{"description":"JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."},"value":{"type":"string","examples":["agent@example.com"],"maxLength":20000,"minLength":1,"description":"Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."},"schema":{"description":"JSON Schema document for schema-check SKUs. Omit it on string checks."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.007","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":"$0.007/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.007","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_TryP4TT17jwMTEkLdm3d1","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.007","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates whether an email address has syntactically valid RFC-compliant structure, without performing any mailbox or DNS lookup.","exampleAgentPrompt":"Can you check if 'user.name+tag@example.co.uk' is a syntactically valid email address according to RFC rules — just the format, no need to check if the mailbox exists.","exampleUseCases":[{"title":"Form input validation before submission","prompt":"Before I save this new user account, check whether 'john.doe@@company.com' is a properly formatted email address — just syntax, no mailbox check needed."},{"title":"Bulk data cleaning pipeline gate","prompt":"I have this email string 'marketing@my-brand..io' from a CSV import — can you tell me if it passes basic RFC email syntax validation so I know whether to flag it?"},{"title":"API input guard for registration endpoint","prompt":"A user just tried to register with the email 'hello world@nowhere' — is that a valid email format according to RFC syntax rules?"}],"resultDescription":"Returns a boolean or structured result indicating whether the submitted email address string conforms to RFC email syntax rules. No mailbox existence, DNS resolution, or SMTP check is performed — purely structural/syntactic validation.","failureModes":["Empty or missing value field returns an error","Value exceeding 20,000 character limit rejected","Malformed JSON request body results in 4xx error","Payment of exactly $0.007 USDC not supplied triggers 402 Payment Required","Sandbox endpoint (/v1/sandbox/check-email-rfc) should be tried first to avoid unnecessary charges"],"whenToPreferThis":"Choose this endpoint when you need a fast, cheap, purely syntactic check of an email address format before storing, routing, or acting on it — and you do not need to verify mailbox existence or deliverability. Prefer the free sandbox variant (/v1/sandbox/check-email-rfc) for testing. Use this paid endpoint only in production flows where sandbox access is unavailable or quota is exhausted.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:49:26.805Z","isFirstParty":false,"canonicalSlug":"agentshelf-syntexa-ch-email-rfc-syntax-validator-14cc3d85"}