{"uid":"cap_LcCVt6Z-HpzzXs5qltrik","slug":"email-plus-tag-syntax-validator-0208290b","name":"Email Plus-Tag Syntax Validator","description":"Call when an agent needs whether an email with a plus tag is syntactically allowed. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-email-plus-ok first.","url":"https://agentshelf.syntexa.ch/v1/check-email-plus-ok?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+tag@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":"0.009","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":"$0.009/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.009","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.009","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_mdfgnjlMd9FWGG4BaU03A","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.009","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether an email address containing a plus tag (e.g. user+tag@example.com) is syntactically valid","exampleAgentPrompt":"Is 'alice+newsletters@example.com' a syntactically valid email address with a plus tag?","exampleUseCases":[{"title":"Form input validation for subaddresses","prompt":"Before we store this user's email 'john.doe+promo@company.org', can you check whether the plus-tag format is syntactically allowed?"},{"title":"Email routing rule pre-check","prompt":"I want to set up a rule that routes emails sent to support+urgent@mybusiness.com — first verify that plus-tag email is syntactically valid."},{"title":"Bulk signup list screening","prompt":"We received a signup with the email 'jane+test123@example.net' — is the plus-tag syntax on that address actually allowed?"}],"resultDescription":"Returns a validation result indicating whether the provided email string with a plus tag is syntactically permitted, based on email address syntax rules — no mailbox or deliverability check is performed.","failureModes":["Empty or missing value field returns an error","Value exceeding 20,000 characters may be rejected","Non-string input may cause a schema validation error","Payment of exactly $0.009 USDC required; incorrect payment leads to HTTP 402","Malformed request body returns a 400-level error"],"whenToPreferThis":"Use this endpoint when you specifically need to validate the plus-tag (subaddressing) portion of an email address for syntactic correctness. Prefer the free sandbox endpoint POST /v1/sandbox/check-email-plus-ok when available. Choose this over the general email syntax validator when you need to confirm plus-tag handling specifically, and over DNS/mailbox lookup services when you only need syntactic, not deliverability, validation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-24T00:54:02.408Z","isFirstParty":false,"canonicalSlug":"email-plus-tag-syntax-validator-0208290b"}