{"uid":"cap_NQOD_xMYAudsmcT1YWQch","slug":"x402-email-verification-api-1c62e3ea","name":"x402 Email Verification API","description":"USDC pay-per-call APIs for AI agents via the x402 protocol (v2, exact, Base mainnet). Send a request, receive HTTP 402 with payment requirements, pay with @x402/fetch or any x402 client, retry with the PAYMENT-SIGNATURE header.","url":"https://call402.com/api/email-verify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"email":{"type":"string","description":"Email address to validate"}}},"responseSchema":{"type":"json","example":{"meta":{"note":"No SMTP mailbox probing.","checks":["syntax","disposable_list","mx_lookup"]},"email":"someone@example.com","domain":"example.com","verdict":"likely_deliverable","mx_found":true,"mx_hosts":["mail.example.com"],"disposable":false,"format_valid":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_n1G8OgfmVAO4zEeR8nBfF","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates an email address by checking syntax, disposable domain lists, and MX DNS records, returning a deliverability verdict","exampleAgentPrompt":"Can you check whether someone@example.com is a valid, deliverable email address — make sure it's not a disposable address and that the domain actually has mail servers set up?","exampleUseCases":[{"title":"Signup form email gating","prompt":"Before I add this lead to my CRM, can you verify that john.doe@gmail.com is a real deliverable email and not a throwaway address?"},{"title":"Bulk list pre-send cleanup","prompt":"I'm about to send a campaign — check if marketing-contact@startupxyz.io is a valid email with working MX records so I don't waste sends on dead addresses."},{"title":"Fraud screening for new accounts","prompt":"A new user just signed up with temp-user@guerrillamail.com — can you tell me if that's a disposable or fake email I should flag?"}],"resultDescription":"Returns a JSON object with the original email and domain, a verdict field (e.g. 'likely_deliverable'), booleans for format_valid, mx_found, and disposable, a list of discovered MX hosts, and metadata describing which checks were performed (syntax, disposable list, MX lookup). No SMTP mailbox probing is performed.","failureModes":["Missing or malformed email field returns a 400-level error","Invalid JSON body causes request rejection","Payment not included or invalid causes HTTP 402 response with payment requirements before processing","Domain with no MX records returns mx_found: false and a conservative verdict","Disposable domains are flagged but not blocked — verdict interpretation is left to the caller"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-use email validation that covers syntax, disposable domain detection, and MX record lookup without SMTP probing. It is ideal for agents that need occasional or low-volume email checks without committing to a subscription-based validation SaaS. The x402 USDC micropayment model makes it cost-effective at $0.005 per call for sporadic validation needs.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T12:36:41.992Z","isFirstParty":false,"canonicalSlug":"x402-email-verification-api-1c62e3ea"}