Create a subscriber

Add one subscriber to your newsletter.

POST /subscribers

Create a subscriber

cURL

curl --request POST \
  --url https://app.letterbucket.com/api/v1/subscribers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "[e-mail]",
  "name": "John Doe"
}
'

import requests

url = "https://app.letterbucket.com/api/v1/subscribers"

payload = {
    "email": "[e-mail]",
    "name": "John Doe"
}
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({email: '[e-mail]', name: 'John Doe'})
};

fetch('https://app.letterbucket.com/api/v1/subscribers', 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.letterbucket.com/api/v1/subscribers",
  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' => '[e-mail]',
    'name' => 'John Doe'
  ]),
  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.letterbucket.com/api/v1/subscribers"

	payload := strings.NewReader("{\n  \"email\": \"[e-mail]\",\n  \"name\": \"John Doe\"\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.letterbucket.com/api/v1/subscribers")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"email\": \"[e-mail]\",\n  \"name\": \"John Doe\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.letterbucket.com/api/v1/subscribers")

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  \"email\": \"[e-mail]\",\n  \"name\": \"John Doe\"\n}"

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

201

{
  "success": true,
  "data": {
    "id": "019756c2-7f3a-7c2e-9b1d-2a4e6f8c0d11",
    "email": "[e-mail]",
    "name": "John Doe",
    "status": "active",
    "created_at": "2026-06-11T17:00:00+00:00"
  }
}

{
  "success": false,
  "code": "validation_error",
  "message": "The request contains invalid data."
}

{
  "success": false,
  "code": "unauthorized",
  "message": "Invalid API key."
}

{
  "success": false,
  "code": "api_access_disabled",
  "message": "API access is not enabled."
}

{
  "success": false,
  "code": "email_already_subscribed",
  "message": "This email is already subscribed to this newsletter.",
  "errors": {
    "email": [
      "Email already subscribed."
    ]
  }
}

{
  "success": false,
  "code": "rate_limit_exceeded",
  "message": "Too many requests. Please try again later.",
  "errors": {
    "retry_after": 42
  }
}

When status is pending, the subscriber receives a confirmation email. When active, the subscriber becomes active directly and no confirmation email is sent.

A duplicate email within the same newsletter returns 422 with code email_already_subscribed.

Authorizations

Authorization · string · header · required

Your API key, sent as Authorization: Bearer sk_....

Body

application/json

email · string<email> · required

Subscriber email address.

Maximum string length: 254

Example:

"[e-mail]"

name · string | null

Full name. Stored as first + last name, split on the first space.

Maximum string length: 255

Example:

"John Doe"

status · enum<string>

Optional. active makes the subscriber active directly; pending sends a confirmation email.

Available options: active, pending

Response

201

application/json

Subscriber created.

success · boolean

data · object

Show child attributes