HALOWERK Email Check
DNS and list based verification. Never claims that a mailbox exists without evidence: without an SMTP probe the verdict for a routable address is "unknown", not "valid".
Offering
- Provider
- mailcheck.netzhandwerker.de
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Infrastructure
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://mailcheck.netzhandwerker.de/email- MIME type
- application/json
- First seen
- 2026-10-16T01:51:30.109Z
- Last seen
- Tags
- Email, Validation, X402, halowerk, email_check
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E"
}
]Observed health
- Status
- Healthy
- Latest latency
- 1191 ms
- Average latency
- 1697 ms
- HTTP status
- 204
- Last checked
- Reachability
- 92.9% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"POST"
]
},
"bodyType": {
"type": "string",
"enum": [
"json",
"form-data",
"text"
]
},
"body": {
"type": "object",
"required": [
"email"
],
"properties": {
"email": {
"type": "string",
"description": "The email address to check."
},
"smtp_check": {
"type": "boolean",
"default": false,
"description": "Ask for an optional SMTP probe. Off by default, heavily throttled, one attempt per target and never retried. Without it the verdict of a routable address stays \"unknown\"."
}
}
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"additionalProperties": false
}Output schema
{
"type": "object",
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"input": {
"type": "string"
},
"normalized": {},
"local_part": {},
"domain": {},
"canonical_hint": {},
"plus_tag": {},
"syntax": {
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
}
},
"additionalProperties": true
},
"domain_reachable": {
"type": "boolean"
},
"mx": {
"type": "object",
"properties": {
"route": {
"type": "string"
},
"null_mx": {
"type": "boolean"
},
"found": {
"type": "boolean"
},
"hosts": {
"type": "array",
"items": {}
},
"count": {
"type": "number"
},
"provider": {}
},
"additionalProperties": true
},
"disposable": {
"type": "object",
"properties": {
"is": {
"type": "boolean"
}
},
"additionalProperties": true
},
"role_account": {
"type": "object",
"properties": {
"is": {
"type": "boolean"
},
"matched": {}
},
"additionalProperties": true
},
"free_provider": {
"type": "boolean"
},
"typo": {
"type": "object",
"properties": {
"suggestion": {},
"suggested_email": {},
"distance": {}
},
"additionalProperties": true
},
"catchall": {
"type": "object",
"properties": {
"state": {
"type": "string"
},
"reason": {
"type": "string"
},
"checked_at": {}
},
"additionalProperties": true
},
"smtp": {
"type": "object",
"properties": {
"attempted": {
"type": "boolean"
},
"accepted": {},
"code": {},
"reason": {
"type": "string"
}
},
"additionalProperties": true
},
"mailbox_exists": {
"type": "boolean"
},
"mailbox_evidence": {
"type": "string"
},
"evidence": {
"type": "array",
"items": {}
},
"verdict": {
"type": "string"
},
"confidence": {
"type": "number"
},
"reasons": {
"type": "array",
"items": {
"type": "string"
}
},
"cache": {
"type": "string"
},
"meta": {
"type": "object",
"properties": {
"duration_ms": {
"type": "number"
},
"cache": {
"type": "string"
}
},
"additionalProperties": true
},
"billing": {
"type": "object",
"properties": {
"addresses": {
"type": "number"
},
"price_usdc": {
"type": "string"
}
},
"additionalProperties": true
},
"payment": {
"type": "object",
"description": "Settlement evidence from a real paid response.",
"additionalProperties": true
}
},
"additionalProperties": true,
"title": "Native email-check result and deterministic billing",
"description": "Core result fields; a transaction-specific payment receipt is added by the paid response middleware."
}
},
"required": [
"type"
]
}