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Email Deliverability Check
x402
Email Deliverability Check is a paid API for AI agents from email-check.hsharmanov02.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).
Checks email deliverability signals for a given domain, returning indicators like SPF, DKIM, DMARC, and MX record status
Price / call$0.01
Success—
StatusUnknown
How this service works
Email deliverability signals for any domain. Paid per call: $0.002 USDC on Base, Monad, Arbitrum, Optimism, Polygon, Avalanche or Solana (eip155:8453) via x402 v2. No API key.
Output
Returns a JSON object containing email deliverability signals for the queried domain, typically including presence and validity of SPF, DKIM, DMARC, and MX DNS records, along with any warnings or flags indicating configuration issues that could affect email deliverability.
Example use cases
Pre-send deliverability audit
“Before we launch this email campaign, can you check whether our domain acme-corp.com has all the right email deliverability records in place — SPF, DMARC, MX, the works?”
Spam troubleshooting for sender domain
“Our transactional emails from notifications.shopify.com keep going to spam — can you check what deliverability signals that domain has and tell me what might be misconfigured?”
Vetting a third-party sender domain
“I'm about to partner with outreach.partnerfirm.io to send co-branded emails — can you check their domain's email deliverability setup so I know if they're a reputable sender?”
Technical details
Endpoint
GEThttps://email-check.hsharmanov02.workers.dev/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, per-domain email deliverability health check without setting up API keys. It is ideal for one-off lookups, automated pre-send audits, or enriching a list of sender domains with authentication signal data. It works across multiple blockchains for micro-payment via x402, making it suitable for lightweight agent workflows that need deliverability checks on demand.
Side effects
- Invalid or malformed domain name returns an error
- Domain does not exist or has no DNS records — may return empty or null signals
- Payment failure via x402 results in 402 response and no data returned
- Network or DNS timeout may cause delayed or failed lookup
- Private or internal domains may not resolve publicly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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