Attribution

Sync a new lead for indirect attribution

Report a new lead/contact from your CRM. Mailr geo-matches the address to a campaign it mailed and records an indirect lead (source crm_sync). Unmatched leads are discarded — they aren’t ours to track. These leads are never delivered back out. Idempotency uses crm_record_id when supplied, then a non-empty email or phone; distinct records with no identity fields remain distinct. Echo mailr_lead_id when the CRM record originated from a Mailr lead and the server suppresses it with reason: loop_guard.

POST

api

tracking

lead

Sync a new lead for indirect attribution

curl --request POST \
  --url https://app.getmailr.com/api/v1/tracking/lead \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "address": "3134 River Valley Dr, Austin, TX 78701",
  "first_name": "Dana",
  "last_name": "Reyes",
  "email": "dana.reyes@example.com",
  "phone": "+15125550143",
  "crm_record_id": "crm-contact-4821",
  "created_at": "2026-08-19T15:04:00Z"
}
'

import requests

url = "https://app.getmailr.com/api/v1/tracking/lead"

payload = {
    "address": "3134 River Valley Dr, Austin, TX 78701",
    "first_name": "Dana",
    "last_name": "Reyes",
    "email": "dana.reyes@example.com",
    "phone": "+15125550143",
    "crm_record_id": "crm-contact-4821",
    "created_at": "2026-08-19T15:04:00Z"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    address: '3134 River Valley Dr, Austin, TX 78701',
    first_name: 'Dana',
    last_name: 'Reyes',
    email: 'dana.reyes@example.com',
    phone: '+15125550143',
    crm_record_id: 'crm-contact-4821',
    created_at: '2026-08-19T15:04:00Z'
  })
};

fetch('https://app.getmailr.com/api/v1/tracking/lead', 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://app.getmailr.com/api/v1/tracking/lead",
  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([
    'address' => '3134 River Valley Dr, Austin, TX 78701',
    'first_name' => 'Dana',
    'last_name' => 'Reyes',
    'email' => 'dana.reyes@example.com',
    'phone' => '+15125550143',
    'crm_record_id' => 'crm-contact-4821',
    'created_at' => '2026-08-19T15:04:00Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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://app.getmailr.com/api/v1/tracking/lead"

	payload := strings.NewReader("{\n  \"address\": \"3134 River Valley Dr, Austin, TX 78701\",\n  \"first_name\": \"Dana\",\n  \"last_name\": \"Reyes\",\n  \"email\": \"dana.reyes@example.com\",\n  \"phone\": \"+15125550143\",\n  \"crm_record_id\": \"crm-contact-4821\",\n  \"created_at\": \"2026-08-19T15:04:00Z\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	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://app.getmailr.com/api/v1/tracking/lead")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"address\": \"3134 River Valley Dr, Austin, TX 78701\",\n  \"first_name\": \"Dana\",\n  \"last_name\": \"Reyes\",\n  \"email\": \"dana.reyes@example.com\",\n  \"phone\": \"+15125550143\",\n  \"crm_record_id\": \"crm-contact-4821\",\n  \"created_at\": \"2026-08-19T15:04:00Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.getmailr.com/api/v1/tracking/lead")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"address\": \"3134 River Valley Dr, Austin, TX 78701\",\n  \"first_name\": \"Dana\",\n  \"last_name\": \"Reyes\",\n  \"email\": \"dana.reyes@example.com\",\n  \"phone\": \"+15125550143\",\n  \"crm_record_id\": \"crm-contact-4821\",\n  \"created_at\": \"2026-08-19T15:04:00Z\"\n}"

response = http.request(request)
puts response.read_body

{
  "matched": true,
  "duplicate": false,
  "lead_id": "c1d2e3f4-0000-0000-0000-000000000020",
  "campaign_id": "aa11bb22-0000-0000-0000-0000000000cc",
  "attribution_type": "indirect"
}

Authorizations

Authorization

string

header

required

Organization-scoped Mailr API key. Header: Authorization: Bearer ak_….

Body

application/json

Fields may also be nested under a properties object (HubSpot/Zapier mappings are tolerated).

address

string

required

first_name

string | null

last_name

string | null

name

string | null

Fallback when first/last are absent.

string | null

phone

string | null

crm_record_id

string | null

CRM record identity; strongest idempotency key, especially for records with no email.

mailr_lead_id

string | null

Echo-loop guard. Set to the Mailr lead id when this CRM record originated from a Mailr New Lead delivery.

created_at

string<date-time> | null

Response

Match result. Unmatched is { "matched": false }. A match returns the attributed campaign and lead id.

Option 1
Option 2

matched

boolean

required

reason

enum<string>

Present when a Mailr-originated lead echo was suppressed.

Available options:

loop_guard

⌘I

Sync a new lead for indirect attribution

curl --request POST \
  --url https://app.getmailr.com/api/v1/tracking/lead \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "address": "3134 River Valley Dr, Austin, TX 78701",
  "first_name": "Dana",
  "last_name": "Reyes",
  "email": "dana.reyes@example.com",
  "phone": "+15125550143",
  "crm_record_id": "crm-contact-4821",
  "created_at": "2026-08-19T15:04:00Z"
}
'

import requests

url = "https://app.getmailr.com/api/v1/tracking/lead"

payload = {
    "address": "3134 River Valley Dr, Austin, TX 78701",
    "first_name": "Dana",
    "last_name": "Reyes",
    "email": "dana.reyes@example.com",
    "phone": "+15125550143",
    "crm_record_id": "crm-contact-4821",
    "created_at": "2026-08-19T15:04:00Z"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    address: '3134 River Valley Dr, Austin, TX 78701',
    first_name: 'Dana',
    last_name: 'Reyes',
    email: 'dana.reyes@example.com',
    phone: '+15125550143',
    crm_record_id: 'crm-contact-4821',
    created_at: '2026-08-19T15:04:00Z'
  })
};

fetch('https://app.getmailr.com/api/v1/tracking/lead', 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://app.getmailr.com/api/v1/tracking/lead",
  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([
    'address' => '3134 River Valley Dr, Austin, TX 78701',
    'first_name' => 'Dana',
    'last_name' => 'Reyes',
    'email' => 'dana.reyes@example.com',
    'phone' => '+15125550143',
    'crm_record_id' => 'crm-contact-4821',
    'created_at' => '2026-08-19T15:04:00Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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://app.getmailr.com/api/v1/tracking/lead"

	payload := strings.NewReader("{\n  \"address\": \"3134 River Valley Dr, Austin, TX 78701\",\n  \"first_name\": \"Dana\",\n  \"last_name\": \"Reyes\",\n  \"email\": \"dana.reyes@example.com\",\n  \"phone\": \"+15125550143\",\n  \"crm_record_id\": \"crm-contact-4821\",\n  \"created_at\": \"2026-08-19T15:04:00Z\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	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://app.getmailr.com/api/v1/tracking/lead")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"address\": \"3134 River Valley Dr, Austin, TX 78701\",\n  \"first_name\": \"Dana\",\n  \"last_name\": \"Reyes\",\n  \"email\": \"dana.reyes@example.com\",\n  \"phone\": \"+15125550143\",\n  \"crm_record_id\": \"crm-contact-4821\",\n  \"created_at\": \"2026-08-19T15:04:00Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.getmailr.com/api/v1/tracking/lead")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"address\": \"3134 River Valley Dr, Austin, TX 78701\",\n  \"first_name\": \"Dana\",\n  \"last_name\": \"Reyes\",\n  \"email\": \"dana.reyes@example.com\",\n  \"phone\": \"+15125550143\",\n  \"crm_record_id\": \"crm-contact-4821\",\n  \"created_at\": \"2026-08-19T15:04:00Z\"\n}"

response = http.request(request)
puts response.read_body

{
  "matched": true,
  "duplicate": false,
  "lead_id": "c1d2e3f4-0000-0000-0000-000000000020",
  "campaign_id": "aa11bb22-0000-0000-0000-0000000000cc",
  "attribution_type": "indirect"
}

Developer API

Endpoints

Sync a new lead for indirect attribution

Authorizations

Body

Response