Reverse Lookups
Reverse Email Lookup
The Reverse Email Lookup API resolves an email address into a complete business profile, including full name, job title, seniority, company, LinkedIn URL, firmographic data, and any other email addresses on file.
Use this endpoint to:
- Enrich inbound leads and form fills with full contact context
- Qualify a prospect before you reach out
- Fill in missing profile data on an existing email list
Fair Use Policy: This API is subject to our Fair Use Policy for Enrichment.
Outcomes:
A lookup that finds nothing is not an error. It returns HTTP 200 with status: "not_found", empty or null results, and the usual metadata — and costs no tokens, though it still counts as one request against your Fair Use requests limit. Read status, not the HTTP code, to tell a hit from a miss. The API’s only 404 is an unknown or retired tool name.
POST
/
reverse_email_lookup
Reverse Email Lookup
curl --request POST \
--url https://api.moltsets.com/api/v1/tools/reverse_email_lookup \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'User-Agent: <user-agent>' \
--data '
{
"email": "john.smith@example.com"
}
'import requests
url = "https://api.moltsets.com/api/v1/tools/reverse_email_lookup"
payload = { "email": "john.smith@example.com" }
headers = {
"User-Agent": "<user-agent>",
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'User-Agent': '<user-agent>',
Authorization: 'Bearer <token>',
'Content-Type': 'application/json'
},
body: JSON.stringify({email: 'john.smith@example.com'})
};
fetch('https://api.moltsets.com/api/v1/tools/reverse_email_lookup', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.moltsets.com/api/v1/tools/reverse_email_lookup",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'email' => 'john.smith@example.com'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"User-Agent: <user-agent>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.moltsets.com/api/v1/tools/reverse_email_lookup"
payload := strings.NewReader("{\n \"email\": \"john.smith@example.com\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("User-Agent", "<user-agent>")
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.moltsets.com/api/v1/tools/reverse_email_lookup")
.header("User-Agent", "<user-agent>")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"email\": \"john.smith@example.com\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.moltsets.com/api/v1/tools/reverse_email_lookup")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["User-Agent"] = '<user-agent>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"email\": \"john.smith@example.com\"\n}"
response = http.request(request)
puts response.read_body{
"results": {
"first_name": "John",
"last_name": "Smith",
"title": "Principal Cybersecurity Engineer",
"seniority": "Manager",
"functional_area": "Information Technology",
"linkedinurl": "https://www.linkedin.com/in/john-smith-123",
"current_company": "MoltSets",
"current_company_url": "https://moltsets.com",
"current_company_linkedinurl": "https://linkedin.com/company/moltsets",
"country": "United States",
"company_employee_count": "3",
"company_employee_range": "1-10",
"company_revenue": "1200000",
"company_revenue_range": "$1M - $5M",
"work_email_confirmed": "a4cd87c390c98385297fbe9250XXXXX",
"work_email_confirmed_status": "2025-10-12",
"work_email_confirmed_risk_score": "A",
"personal_emails": [
"3018fe3a783fad1db0370ee3fXXXXX"
],
"personal_emails_status": [
null
],
"personal_emails_risk_score": [
"A"
]
},
"status": "ok",
"metadata": {
"fair_use": {
"records_remaining_5h": 179999,
"records_reset_5h": "2026-07-15T18:53:16Z",
"records_remaining_1w": 899999,
"records_reset_1w": "2026-07-22T13:53:16Z"
}
}
}Authorizations
Pass your API key as a Bearer token. Keys follow the format ms_XXXXXXXXXXX.
Headers
Identifies the calling client. Any non-empty value is accepted — MoltSets does not validate its contents. Requests without this header are rejected with 403 Forbidden (error.code: forbidden).
Body
application/json
Email address.
Response
Success
⌘I
Reverse Email Lookup
curl --request POST \
--url https://api.moltsets.com/api/v1/tools/reverse_email_lookup \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'User-Agent: <user-agent>' \
--data '
{
"email": "john.smith@example.com"
}
'import requests
url = "https://api.moltsets.com/api/v1/tools/reverse_email_lookup"
payload = { "email": "john.smith@example.com" }
headers = {
"User-Agent": "<user-agent>",
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'User-Agent': '<user-agent>',
Authorization: 'Bearer <token>',
'Content-Type': 'application/json'
},
body: JSON.stringify({email: 'john.smith@example.com'})
};
fetch('https://api.moltsets.com/api/v1/tools/reverse_email_lookup', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.moltsets.com/api/v1/tools/reverse_email_lookup",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'email' => 'john.smith@example.com'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"User-Agent: <user-agent>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.moltsets.com/api/v1/tools/reverse_email_lookup"
payload := strings.NewReader("{\n \"email\": \"john.smith@example.com\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("User-Agent", "<user-agent>")
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.moltsets.com/api/v1/tools/reverse_email_lookup")
.header("User-Agent", "<user-agent>")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"email\": \"john.smith@example.com\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.moltsets.com/api/v1/tools/reverse_email_lookup")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["User-Agent"] = '<user-agent>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"email\": \"john.smith@example.com\"\n}"
response = http.request(request)
puts response.read_body{
"results": {
"first_name": "John",
"last_name": "Smith",
"title": "Principal Cybersecurity Engineer",
"seniority": "Manager",
"functional_area": "Information Technology",
"linkedinurl": "https://www.linkedin.com/in/john-smith-123",
"current_company": "MoltSets",
"current_company_url": "https://moltsets.com",
"current_company_linkedinurl": "https://linkedin.com/company/moltsets",
"country": "United States",
"company_employee_count": "3",
"company_employee_range": "1-10",
"company_revenue": "1200000",
"company_revenue_range": "$1M - $5M",
"work_email_confirmed": "a4cd87c390c98385297fbe9250XXXXX",
"work_email_confirmed_status": "2025-10-12",
"work_email_confirmed_risk_score": "A",
"personal_emails": [
"3018fe3a783fad1db0370ee3fXXXXX"
],
"personal_emails_status": [
null
],
"personal_emails_risk_score": [
"A"
]
},
"status": "ok",
"metadata": {
"fair_use": {
"records_remaining_5h": 179999,
"records_reset_5h": "2026-07-15T18:53:16Z",
"records_remaining_1w": 899999,
"records_reset_1w": "2026-07-22T13:53:16Z"
}
}
}