Validate an email address before you accept a signup or send to it
Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain (community blocklist), and whether it is a role account (info@, support@…). DNS is checked over DoH. No SMTP probing (intrusive and spammy), so a true 'domainExists' does not guarantee the mailbox exists.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://staging.402utils.com/v1/email-check
| Category | Everything else |
|---|---|
| Provider host | staging.402utils.com |
| Networks | eip155:84532 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"email": "user@example.com"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"description": "Query string only.",
"properties": {
"email": {
"description": "The email address to validate (required).",
"format": "email",
"type": "string"
}
},
"required": [
"email"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"checkedAt": {
"format": "date-time",
"type": "string"
},
"disposable": {
"description": "Domain is on the disposable-email blocklist.",
"type": "boolean"
},
"domainExists": {
"description": "Best-effort: domain has MX or A records (DoH).",
"type": "boolean"
},
"email": {
"type": "string"
},
"mxRecords": {
"items": {
"type": "string"
},
"type": "array"
},
"roleAccount": {
"description": "Local part is a role address (info, support\u2026).",
"type": "boolean"
},
"syntaxValid": {
"type": "boolean"
}
},
"required": [
"email",
"syntaxValid",
"domainExists",
"mxRecords",
"disposable",
"roleAccount",
"checkedAt"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}