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Batch Email Address Validator
x402
Batch Email Address Validator is a paid API for AI agents from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-19).
Validates up to 25 email addresses at once, checking syntax, DNS/MX records, and classifying each as deliverable, undeliverable, or unknown with flags for disposable, role-account, free-provider, and placeholder domains.
Price / call$0.25
Success—
StatusUnknown
How this service works
An open index of the machine-to-machine (agent) economy. x402 routes: ranked discovery over the live x402 service market, every indexed service scored by real 30-day calls and paying-wallet bounds, with a receipt naming the snapshot hash and scoring revision. /economy routes, for Tempo MPP, Virtuals ACP, Olas, Masumi, ERC-8004 agent registries, Solana agent registries, Base agent contracts and MCP servers (Official MCP Registry): each protocol's published figures (agent or server counts, transactions or payment events; payers and USD volume only where the source publishes them: payers for x402 and Tempo MPP, USD volume for x402 and Virtuals ACP), each with its unit, window and source; units differ, so totals are not summed. L402 and per-service MPP listings are not covered.
Output
A JSON object with a count of checked addresses and a results array. Each entry includes: the original and normalized email, domain, verdict (deliverable/undeliverable/unknown), reason, has_mx boolean, null_mx flag, MX records with host and priority, DNS source, checked_at timestamp, and boolean flags for disposable, role_account, free_provider, and placeholder. Duplicates (case-insensitive) are removed before processing. No SMTP mailbox probe is performed.
Example use cases
Pre-send campaign list scrubbing
“Before I send this newsletter, can you check these 20 subscriber emails and flag any that are undeliverable, disposable, or role-based accounts so I can remove them?”
New user signup fraud screening
“We just got 15 new signups — can you run all their email addresses through validation and tell me which ones look fake, use throwaway domains, or belong to free providers like Gmail or Yahoo?”
CRM import data hygiene
“I'm about to import a batch of 25 contacts into our CRM. Can you validate all their email addresses first and tell me which domains actually publish MX records and which emails look like placeholders?”
Technical details
Endpoint
POSThttps://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/v1/email/verify/batch?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to validate multiple email addresses in a single API call (up to 25) and want DNS-level deliverability checks plus classification flags (disposable, role account, free provider, placeholder) without performing SMTP probes. It is ideal for batch list hygiene, signup screening, or pre-send validation workflows where cost efficiency per address matters. Prefer it over single-address endpoints when processing lists; prefer it over full SMTP-probe services when you only need domain-level deliverability and classification.
Side effects
- Invalid email format causes that address to receive an 'undeliverable' verdict with a syntax reason
- Domain with no MX and no A/AAAA fallback returns has_mx: false and verdict 'undeliverable'
- DNS lookup failure due to resolver outage may return verdict 'unknown'
- Batch exceeds 25 addresses — request rejected with validation error
- Empty emails array — rejected due to minItems: 1 constraint
- Catch-all domains cannot be detected — deliverable_domain does not mean the specific mailbox exists
- Domains not in embedded lists are not guaranteed safe — absence of 'disposable' flag is not proof of legitimacy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emails | array | 1 to 25 email addresses to check; duplicates are removed |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Each address is checked exactly like the single /v1/email/verify call (same syntax rules, DNS lookups, verdicts and flags); addresses sharing a domain share one DNS answer. Duplicates (case-insensitive) are removed. Price is fixed per call for 1 to 25 addresses. No SMTP mailbox probe is made (outbound port 25 is blocked on Cloudflare Workers), so deliverable_domain means the domain accepts mail (it publishes MX, or A/AAAA as the RFC 5321 fallback), NOT that this mailbox exists; catch-all is not detected. DNS was read once via a public DNS-over-HTTPS resolver at checked_at. disposable/role_account/free_provider/placeholder come from fixed embedded lists: a domain missing from them is not proven safe. normalized lowercases the address and converts the domain to ASCII (IDNA); it does not strip dots or +tags.",
"count": 2,
"source": "public DNS-over-HTTPS resolvers (cloudflare-dns.com, dns.google as fallback) and embedded lists",
"results": [
{
"mx": [
{
"host": "gmail-smtp-in.l.google.com",
"priority": 5
},
{
"host": "alt1.gmail-smtp-in.l.google.com",
"priority": 10
},
{
"host": "alt2.gmail-smtp-in.l.google.com",
"priority": 20
},
{
"host": "alt3.gmail-smtp-in.l.google.com",
"priority": 30
},
{
"host": "alt4.gmail-smtp-in.l.google.com",
"priority": 40
}
],
"note": "No SMTP mailbox probe is made (outbound port 25 is blocked on Cloudflare Workers), so deliverable_domain means the domain accepts mail (it publishes MX, or A/AAAA as the RFC 5321 fallback), NOT that this mailbox exists; catch-all is not detected. DNS was read once via a public DNS-over-HTTPS resolver at checked_at. disposable/role_account/free_provider/placeholder come from fixed embedded lists: a domain missing from them is not proven safe. normalized lowercases the address and converts the domain to ASCII (IDNA); it does not strip dots or +tags.",
"email": "Support@GMAIL.com",
"domain": "gmail.com",
"has_mx": true,
"reason": "domain publishes MX records",
"source": "cloudflare-dns.com",
"null_mx": false,
"verdict": "deliverable_domain",
"syntax_ok": true,
"a_fallback": false,
"checked_at": "2026-10-06T18:28:55.242Z",
"disposable": false,
"dns_status": "NOERROR",
"normalized": "support@gmail.com",
"placeholder": false,
"role_account": true,
"syntax_error": null,
"domain_exists": true,
"free_provider": true,
"needs_smtputf8": false
},
{
"mx": null,
"note": "No SMTP mailbox probe is made (outbound port 25 is blocked on Cloudflare Workers), so deliverable_domain means the domain accepts mail (it publishes MX, or A/AAAA as the RFC 5321 fallback), NOT that this mailbox exists; catch-all is not detected. DNS was read once via a public DNS-over-HTTPS resolver at checked_at. disposable/role_account/free_provider/placeholder come from fixed embedded lists: a domain missing from them is not proven safe. normalized lowercases the address and converts the domain to ASCII (IDNA); it does not strip dots or +tags.",
"email": "no-at-sign",
"domain": null,
"has_mx": null,
"reason": "must contain exactly one @",
"source": null,
"null_mx": null,
"verdict": "invalid_syntax",
"syntax_ok": false,
"a_fallback": null,
"checked_at": "2026-10-18T12:00:00.000Z",
"disposable": false,
"dns_status": null,
"normalized": null,
"placeholder": false,
"role_account": false,
"syntax_error": "must contain exactly one @",
"domain_exists": null,
"free_provider": false,
"needs_smtputf8": false
}
],
"checked_at": "2026-10-18T12:00:00.000Z"
}
}Tags
x402
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