{"uid":"cap_P2wgRscLaqbEqmmWBnoB1","slug":"email-syntax-check-watch-change-detection-266f2f5f","name":"Email Syntax Check Watch (Change Detection)","description":"Change watch for email syntax check: runs the check and compares it with the result from your previous call for the same email (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when fast email syntax check changes. $0.01 per check.","url":"https://intel.rallylive.ca/watch/email/syntax","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_o_GMYskt2WBqiKfIaWf6S","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks email address syntax validity and detects changes compared to the previous check for the same email, returning current result, a changed flag, field-level diffs with before/after values, and last-seen timestamp.","exampleAgentPrompt":"Keep an eye on the syntax check for user@example.com and let me know if the result changes from the last time you checked — show me exactly which fields are different and what they were before.","exampleUseCases":[{"title":"Email onboarding quality monitoring","prompt":"Check the syntax of signups@mybrand.co every day and alert me if the validation result ever changes — I want to see what specifically changed and what the old value was."},{"title":"Automated email field drift detection","prompt":"I need you to poll the email syntax check for contact@partner-domain.org on a schedule and tell me right away if the changed flag comes back true, including the before and after values for any fields that flipped."},{"title":"Email validity regression tracking","prompt":"Watch the syntax check result for test.address+filter@subdomain.example.net and compare it to the last stored result — did anything change? Show me a diff if so."}],"resultDescription":"Returns the current email syntax check result (valid/invalid), a boolean 'changed' flag indicating whether the result differs from the previous call for that email (stored up to 90 days), a list of exactly which fields changed with before and after values, and the timestamp of when the email was last seen/checked.","failureModes":["No email query parameter provided — returns error indicating required input missing","Email not previously checked — no stored baseline, so 'changed' will be false or unavailable for first call","Stored result expired (older than 90 days) — comparison baseline lost, treated as first-time check","Invalid HTTP method — only GET is supported","Payment failure — x402 payment not provided or insufficient, request rejected"],"whenToPreferThis":"Choose this endpoint when you need change detection on email syntax checks, not just a one-off validation. It is ideal for scheduled/polling workflows where you want to be notified only when the validity result actually changes, with a structured diff of what changed. Prefer this over a simple syntax check when you need historical comparison, audit trails, or event-driven automation triggered by validation state changes.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:44:06.789Z","isFirstParty":false}