Verify email deliverability via Hunter.io at $0.03 per request, paid via micropayment.
What it does
This endpoint verifies email deliverability by proxying Hunter.io's email verification service through StableEnrich's pay-per-request gateway. Send a POST request with an email address and receive a detailed verification report including deliverability status (valid, invalid, accept_all, webmail, disposable, unknown), a confidence score, and technical checks such as MX records, SMTP server availability, SMTP check result, gibberish detection, disposable/webmail flags, and whether the domain is a catch-all.
The endpoint is part of StableEnrich, a unified micropayment-gated API platform that aggregates multiple data providers (Apollo, Exa, Firecrawl, Google Maps, Serper, Whitepages, Clado, Minerva, Hunter, and others) behind a single interface. Payment is handled via the MPP (Micropayment Protocol) or x402, settling on Base mainnet (USDC), Solana, or Tempo. No API keys or subscriptions are required — payment itself serves as authentication. The price is $0.03 per request.
The response also includes a sources array showing where the email was found on the web, with domain, URI, extraction date, and whether it's still present on the page. This makes it useful not just for deliverability checks but also for understanding the provenance of an email address.
Capabilities
Use cases
- —Validate email addresses before sending outreach campaigns to reduce bounce rates
- —Pre-screen enriched contact data from Apollo or Clado to confirm deliverability
- —Detect disposable or temporary email addresses during signup flows
- —Verify catch-all domains to assess email confidence for sales prospecting
- —Audit email lists for hygiene before importing into CRM systems
Fit
Best for
- —Agents performing contact enrichment pipelines that need deliverability confirmation
- —Automated outreach workflows requiring bounce-rate reduction
- —List hygiene checks before bulk email sends
Not for
- —Bulk email sending — this only verifies, it does not send emails
- —Finding or discovering email addresses (use Apollo or Minerva for that)
- —Real-time transactional email validation at sub-10ms latency
Quick start
POST https://stableenrich.dev/api/hunter/email-verifier
Content-Type: application/json
{"email": "test@stripe.com"}Example
Request
{
"email": "test@stripe.com"
}Response
{
"block": false,
"email": "test@stripe.com",
"score": 91,
"regexp": true,
"status": "valid",
"sources": [
{
"uri": "https://stripe.com/about",
"domain": "stripe.com",
"extracted_on": "2024-01-15",
"last_seen_on": "2024-06-01",
"still_on_page": true
}
],
"webmail": false,
"gibberish": false,
"accept_all": false,
"disposable": false,
"mx_records": true,
"smtp_check": true,
"smtp_server": true
}Endpoint
Quality
Full OpenAPI schema with request/response types, clear pricing ($0.03/request), documented examples, and detailed guidance are all present. The endpoint returned 405 on HEAD/GET probes (expected since it's POST-only), so no live 402 challenge was captured, but the OpenAPI spec and pricing table confirm it is active. Slight deduction for lack of a captured 402 challenge on the specific endpoint.
Warnings
- —Probe returned 405 on HEAD and GET — this is expected for a POST-only endpoint, not an indication the endpoint is down.
- —No live 402 MPP challenge was captured for this specific endpoint; liveness is inferred from the OpenAPI spec and platform documentation.
Citations
- —Hunter Email Verifier endpoint price is $0.03 per requesthttps://stableenrich.dev
- —Endpoint accepts POST with email field and returns status, score, and technical verification flagshttps://stableenrich.dev/docs
- —Payment is processed via x402 or MPP on Base mainnet, Solana, or Tempo with no API keys requiredhttps://stableenrich.dev
- —Response schema includes status enum (valid, invalid, accept_all, webmail, disposable, unknown), score, and boolean checks for regexp, gibberish, disposable, webmail, mx_records, smtp_server, smtp_check, accept_all, blockhttps://stableenrich.dev