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Hunter Email Verifier
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Hunter Email Verifier is a paid API for AI agents from StableEnrich at stableenrich.dev, paid per call via MPP or x402, $0.03/call, status unknown (last checked 2026-10-10, last successful call 2026-06-25).
Verifies the deliverability of an email address by checking SMTP, MX records, disposability, and other signals to produce a validity status and confidence score
Price / call$0.03
Success90%
StatusUnknown
How this service works
Hunter - Verify email deliverability. Fast and cached verifications return the final result immediately; Hunter pending responses return a job id to poll with SIWX.
Output
Returns a structured object with: a status enum (valid/invalid/accept_all/webmail/disposable/unknown), a numeric deliverability score (0–1), and boolean flags for regexp match, gibberish detection, disposable address, webmail provider, MX records existence, SMTP server reachability, SMTP deliverability check, accept-all domain, and blocked status. Also includes an array of web sources where the email was previously seen.
Example use cases
Example prompt
“Can you verify whether john.smith@acme.com is a real, deliverable email address — check if it's disposable, has valid MX records, and give me a deliverability score?”
Technical details
Endpoint
POSThttps://stableenrich.dev/api/hunter/email-verifier?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify individual email addresses before outreach campaigns, user registration, or data enrichment workflows. Prefer this over format-only validators when you need real SMTP and MX-level verification. Choose this when you need Hunter's additional signal of web-sourced sightings of the email address, or when you need disposable/webmail/gibberish detection beyond basic format checks.
Side effects
- Invalid email format returns validation error before API call
- Unknown or unresolvable domain returns status 'unknown' with low score
- Disposable/temporary email services return status 'disposable'
- SMTP server unreachable returns smtp_server: false and smtp_check: false
- Accept-all domains return status 'accept_all' — cannot confirm individual address
- Rate limit or payment failure returns 402 or 429 error
Input
{
"email": "zero-qa@agentmail.to"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| emailrequired | string | Email address to verify |
Output
{
"block": false,
"email": "zero-qa@agentmail.to",
"score": 72,
"regexp": true,
"result": "risky",
"status": "accept_all",
"sources": [],
"webmail": false,
"gibberish": false,
"accept_all": true,
"disposable": false,
"mx_records": true,
"smtp_check": true,
"smtp_server": true,
"_deprecation_notice": "Using result is deprecated, use status instead"
}Schema · Response
{
"anyOf": [
{
"type": "object",
"required": [
"status",
"score",
"email",
"regexp",
"gibberish",
"disposable",
"webmail",
"mx_records",
"smtp_server",
"smtp_check",
"accept_all",
"block",
"sources"
],
"properties": {
"block": {
"type": "boolean"
},
"email": {
"type": "string"
},
"score": {
"type": "number"
},
"regexp": {
"type": "boolean"
},
"status": {
"enum": [
"valid",
"invalid",
"accept_all",
"webmail",
"disposable",
"unknown"
],
"type": "string"
},
"sources": {
"type": "array",
"items": {
"type": "object",
"required": [
"domain",
"uri",
"extracted_on",
"last_seen_on",
"still_on_page"
],
"properties": {
"uri": {
"type": "string"
},
"domain": {
"type": "string"
},
"extracted_on": {
"type": "string"
},
"last_seen_on": {
"type": "string"
},
"still_on_page": {
"type": "boolean"
}
},
"additionalProperties": false
},
"default": []
},
"webmail": {
"type": "boolean"
},
"gibberish": {
"type": "boolean"
},
"accept_all": {
"type": "boolean"
},
"disposable": {
"type": "boolean"
},
"mx_records": {
"type": "boolean"
},
"smtp_check": {
"type": "boolean"
},
"smtp_server": {
"type": "boolean"
}
},
"additionalProperties": false
},
{
"type": "object",
"required": [
"jobId",
"status",
"pollUrl",
"retryAfterSeconds"
],
"properties": {
"jobId": {
"type": "string",
"description": "StableEnrich job id for the pending verification"
},
"status": {
"type": "string",
"const": "pending"
},
"pollUrl": {
"type": "string",
"format": "uri",
"description": "SIWX-authenticated URL to poll"
},
"retryAfterSeconds": {
"type": "integer",
"maximum": 9007199254740991,
"exclusiveMinimum": 0
}
},
"additionalProperties": false
}
]
}Tags
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