Email verification and validation for signup, CRM, lead and outreach agents
Email verification and validation for signup, CRM, lead and outreach agents: RFC syntax, live DNS mail routing (MX, null MX, implicit MX), 9,000+ disposable/throwaway domains, role addresses (info@, sales@), free providers, typo suggestions (gmial.com to gmail.com) and the domain SPF/DMARC setup. One verdict: deliverable, risky or undeliverable. Domain lookups cached for speed.
Answeringour last check, 2026-10-10
1 of 1checks answered this week
23 msmedian answer time
$0.002listed price per call
$0.002price it asked us
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://factline.dev/v1/email/verify
| Category | Everything else |
|---|---|
| Provider host | factline.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.002 | 23 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"email": "jan.jansen@gmial.com"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"email": {
"description": "Email address to verify, e.g. jan.jansen@example.nl",
"type": "string"
}
},
"required": [
"email"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}