{"uid":"cap_PeHIFMqCu61iw71sYj1Rk","slug":"inboxpolicy-send-decision-email-verification-api-d09f0e38","name":"InboxPolicy Send-Decision Email Verification API","description":"Email verification API that returns a decision — send, review, or avoid — with evidence. $0.01/call via x402, no account. Free 72h re-verification.","url":"https://api.inboxpolicy.com/v1/verify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["email"],"properties":{"email":{"type":"string","description":"Address to evaluate."},"strictness":{"enum":["aggressive","default","strict"],"type":"string"},"force_refresh":{"type":"boolean","description":"Bypass the 72h verification cache."}}},"responseSchema":{"type":"object","required":["action","confidence","status"],"properties":{"cost":{"type":"object","properties":{"credits":{"type":"integer"},"billable":{"type":"boolean"}}},"action":{"enum":["send","send_with_caution","review","retry_later","avoid"],"type":"string"},"reason":{"type":"string"},"status":{"enum":["valid","invalid","unknown","temporary_unavailable","syntax_error"],"type":"string"},"signals":{"type":"object","properties":{"free":{"type":"boolean"},"catch_all":{"type":"boolean"},"disposable":{"type":"boolean"},"role_account":{"type":"boolean"}}},"confidence":{"type":"integer","maximum":100,"minimum":0},"from_cache":{"type":"boolean"},"request_id":{"type":"string","example":"vrf_..."}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_AcdRn8w7RDwBzhBz6frkU","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies an email address and returns an actionable send-decision (send, review, or avoid) with confidence score and deliverability signals","exampleAgentPrompt":"Can you check whether john.doe@example.com is safe to email — I need a send-or-avoid decision with confidence score and any signals like whether it's disposable or a catch-all?","exampleUseCases":[{"title":"Pre-send lead email validation","prompt":"Before I send outreach to leads@bigcorp.com, can you verify it and tell me if I should send, review, or avoid — and flag if it's a catch-all or role account?"},{"title":"Cleaning a signup email list","prompt":"A new user signed up with throwaway99@mailinator.com — can you check if it's disposable and give me a confidence score on whether we should keep them in our list?"},{"title":"Protecting transactional email reputation","prompt":"We're about to send a password reset to noreply@somecompany.org — can you verify it and give me an evidence-backed decision on whether it's safe to deliver to?"}],"resultDescription":"Returns a JSON object with an action enum (send, send_with_caution, review, retry_later, or avoid), a confidence integer (0–100), a deliverability status (valid, invalid, unknown, temporary_unavailable, syntax_error), a human-readable reason string, and a signals object with boolean flags for disposable, catch_all, role_account, and free provider. Also includes a from_cache flag, a request_id for tracing, and billing metadata.","failureModes":["Invalid or malformed email syntax returns status: syntax_error and action: avoid","Greylisted or temporarily unresponsive mail servers return status: temporary_unavailable and action: retry_later","Catch-all domains return low-confidence results since individual address existence cannot be confirmed","Cached results (within 72h window) are returned by default; use force_refresh: true to bypass","Payment failure via x402 will prevent the request from completing","Rate limits or network errors may return HTTP 429 or 5xx responses"],"whenToPreferThis":"Use this endpoint when you need an opinionated, evidence-backed send-or-avoid decision rather than just a syntax check or basic MX lookup. Prefer it for pre-send validation in email outreach pipelines, list hygiene workflows, and transactional email systems where bounce rates and reputation matter. The $0.01/call pay-per-use model with no account required makes it ideal for sporadic or agent-driven verification without subscription overhead. The built-in 72h verification cache reduces cost for repeated checks on the same address.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:33:48.413Z","isFirstParty":false,"canonicalSlug":"inboxpolicy-send-decision-email-verification-api-5568e02d"}