{"uid":"cap_ZQ0mmmVBpi12DJZJ0NUbo","slug":"inboxpolicy-send-decision-email-verification-api-96be538c","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/decide?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_KRbRj-EcGzuF6zX2w0adG","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 before we add them to our list?","exampleUseCases":[{"title":"Pre-send list hygiene check","prompt":"Before I send this newsletter, verify whether sarah.johnson@acmecorp.com is safe to contact — give me the send decision and flag if it's a disposable or catch-all address."},{"title":"New user signup email screening","prompt":"A user just signed up with the email temp123@mailinator.com — can you run it through InboxPolicy and tell me if I should allow the account or mark it for review?"},{"title":"Force-refresh stale verification","prompt":"We checked dev-team@bigclient.org last week but I want a fresh verification today — bypass the cache and tell me the current send decision and confidence score."}],"resultDescription":"Returns a JSON object with an 'action' enum (send, send_with_caution, review, retry_later, or avoid), a confidence score (0–100), a validity status (valid, invalid, unknown, temporary_unavailable, syntax_error), a human-readable reason, boolean signals (disposable, catch_all, free, role_account), a cache flag, and a unique request ID. Billing metadata indicates whether the call was charged.","failureModes":["Invalid or malformed email syntax returns status 'syntax_error' with action 'avoid'","Temporary DNS or SMTP lookup failures return status 'temporary_unavailable' with action 'retry_later'","Payment failure via x402 results in a 402 response before verification is attempted","Rate limiting or network errors return HTTP 4xx/5xx without a verification result","Unknown domains with catch-all servers may return low-confidence results with action 'review'"],"whenToPreferThis":"Choose this endpoint when you need an actionable send/avoid decision rather than just a syntactic validity check — it performs live SMTP and domain checks with disposable, catch-all, and role-account signals. Ideal for pre-send list hygiene, signup screening, or CRM enrichment where a binary valid/invalid result is insufficient. The $0.01/call micropayment via x402 requires no account signup, making it suitable for agent workflows that need on-demand verification without API key management. The 72-hour cache keeps repeated checks free.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T06:37:58.087Z","isFirstParty":false,"canonicalSlug":"inboxpolicy-send-decision-email-verification-api-5568e02d"}