> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://mailchimp.com/developer/marketing/api/lists/create-member/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://mailchimp.com/_mcp/server.

# Add member to list

POST https://api.mailchimp.com/3.0/lists/{list_id}/members
Content-Type: application/json

Add a new member to the list.

Reference: https://mailchimp.com/developer/marketing/api/lists/create-member

## Authentication

- `Authorization` header (bearer token, required) — Authorization using a Mailchimp API key (a.k.a. Bearer token)
- `Authorization` header (bearer token, required) — Authorization using OAuth

## Request

### Path parameters

- `list_id` (string, required) — The unique ID for the list.

### Query parameters

- `skip_merge_validation` (boolean, optional) — If skip_merge_validation is true, member data will be accepted without merge field values, even if the merge field is usually required. This defaults to false.

### Body (application/json)

This endpoint expects an object.

- `email_address` (string, required) — Email address for a subscriber.
- `status` (enum, required) — Subscriber's current status.
  - Allowed values: `subscribed`, `unsubscribed`, `cleaned`, `pending`, `transactional`
- `email_type` (string, optional) — Type of email this member asked to get ('html' or 'text').
- `interests` (map from string to boolean, optional) — The key of this object's properties is the ID of the interest in question.
- `ip_opt` (string, optional) — The IP address the subscriber used to confirm their opt-in status.
- `ip_signup` (string, optional) — IP address the subscriber signed up from.
- `language` (string, optional) — If set/detected, the [subscriber's language](https://mailchimp.com/help/view-and-edit-contact-languages/).
- `location` (30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaLocation, optional) — Subscriber location information.
- `marketing_permissions` (list of 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaMarketingPermissionsItems, optional) — The marketing permissions for the subscriber.
- `merge_fields` (map from string to 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaMergeFields, optional) — A dictionary of merge fields where the keys are the merge tags. See the [Merge Fields documentation](https://mailchimp.com/developer/marketing/docs/merge-fields/#structure) for more about the structure.
- `tags` (list of string, optional) — The tags that are associated with a member.
- `timestamp_opt` (30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaTimestampOpt, optional)
- `timestamp_signup` (30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaTimestampSignup, optional)
- `vip` (boolean, optional) — [VIP status](https://mailchimp.com/help/designate-and-send-to-vip-contacts/) for subscriber.

## Response

### 200

- `_links` (list of ListMembersLinksItems, optional) — A list of link types and descriptions for the API schema documents.
- `consents_to_one_to_one_messaging` (boolean, optional) — Indicates whether a contact consents to 1:1 messaging.
- `contact_id` (string, optional) — As Mailchimp evolves beyond email, you may eventually have contacts without email addresses. While the `id` is the MD5 hash of their email address, this `contact_id` is agnostic of contact’s inclusion of an email address.
- `email_address` (string, optional) — Email address for a subscriber.
- `email_client` (string, optional) — The list member's email client.
- `email_type` (any, optional) — Type of email this member asked to get ('html' or 'text').
- `id` (string, optional) — The MD5 hash of the lowercase version of the list member's email address.
- `interests` (map from string to boolean, optional) — The key of this object's properties is the ID of the interest in question.
- `ip_opt` (string, optional) — The IP address the subscriber used to confirm their opt-in status.
- `ip_signup` (string, optional) — IP address the subscriber signed up from.
- `language` (string, optional) — If set/detected, the [subscriber's language](https://mailchimp.com/help/view-and-edit-contact-languages/).
- `last_changed` (datetime, optional) — The date and time the member's info was last changed in ISO 8601 format.
- `last_note` (ListMembersLastNote, optional) — The most recent Note added about this member.
- `list_id` (string, optional) — The list id.
- `location` (ListMembersLocation, optional) — Subscriber location information.
- `marketing_permissions` (list of ListMembersMarketingPermissionsItems, optional) — The marketing permissions for the subscriber.
- `member_rating` (integer, optional) — Star rating for this member, between 1 and 5.
- `merge_fields` (map from string to ListMembersMergeFields, optional, nullable) — A dictionary of merge fields where the keys are the merge tags. See the [Merge Fields documentation](https://mailchimp.com/developer/marketing/docs/merge-fields/#structure) for more about the structure.
- `sms_phone_number` (string, optional) — A US phone number for SMS contact.
- `sms_subscription_last_updated` (string, optional) — The datetime when the SMS subscription was last updated
- `sms_subscription_status` (enum, optional) — The status of an SMS subscription.
  - Allowed values: `subscribed`, `unsubscribed`, `nonsubscribed`, `pending`
- `source` (string, optional) — The source from which the subscriber was added to this list.
- `stats` (ListMembersStats, optional) — Open and click rates for this subscriber.
- `status` (enum, optional) — Subscriber's current status.
  - Allowed values: `subscribed`, `unsubscribed`, `cleaned`, `pending`, `transactional`, `archived`
- `tags` (list of ListMembersTagsItems, optional) — Returns up to 50 tags applied to this member. To retrieve all tags see [Member Tags](https://mailchimp.com/developer/marketing/api/list-member-tags/).
- `tags_count` (integer, optional) — The number of tags applied to this member.
- `timestamp_opt` (datetime, optional) — The date and time the subscriber confirmed their opt-in status in ISO 8601 format.
- `timestamp_signup` (datetime, optional) — The date and time the subscriber signed up for the list in ISO 8601 format.
- `unique_email_id` (string, optional) — An identifier for the address across all of Mailchimp.
- `unsubscribe_reason` (string, optional) — A subscriber's reason for unsubscribing.
- `vip` (boolean, optional) — [VIP status](https://mailchimp.com/help/designate-and-send-to-vip-contacts/) for subscriber.
- `web_id` (integer, optional) — The ID used in the Mailchimp web application. View this member in your Mailchimp account at `https://{dc}.admin.mailchimp.com/lists/members/view?id={web_id}`.

## Types

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaLocation

Subscriber location information.

- `latitude` (30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaLocationLatitude, optional)
- `longitude` (30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaLocationLongitude, optional)

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaMarketingPermissionsItems

A single marketing permission a subscriber has either opted-in to or opted-out of.

- `enabled` (boolean, optional) — If the subscriber has opted-in to the marketing permission.
- `marketing_permission_id` (string, optional) — The id for the marketing permission on the list

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaMergeFields

This object's keys are merge tags (like FNAME). It's values are the values to be added to the merge field.

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaTimestampOpt

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaTimestampSignup

### ListMembersLinksItems

This object represents a link from the resource where it is found to another resource or action that may be performed.

- `href` (string, optional) — This property contains a fully-qualified URL that can be called to retrieve the linked resource or perform the linked action.
- `method` (enum, optional) — The HTTP method that should be used when accessing the URL defined in 'href'.
  - Allowed values: `GET`, `POST`, `PUT`, `PATCH`, `DELETE`, `OPTIONS`, `HEAD`
- `rel` (string, optional) — As with an HTML 'rel' attribute, this describes the type of link.
- `schema` (string, optional) — For HTTP methods that can receive bodies (POST and PUT), this is a URL representing the schema that the body should conform to.
- `targetSchema` (string, optional) — For GETs, this is a URL representing the schema that the response should conform to.

### ListMembersLastNote

The most recent Note added about this member.

- `created_at` (datetime, optional) — The date and time the note was created in ISO 8601 format.
- `created_by` (string, optional) — The author of the note.
- `note` (string, optional) — The content of the note.
- `note_id` (integer, optional) — The note id.

### ListMembersLocation

Subscriber location information.

- `country_code` (string, optional) — The unique code for the location country.
- `dstoff` (integer, optional) — The offset for timezones where daylight saving time is observed.
- `gmtoff` (integer, optional) — The time difference in hours from GMT.
- `latitude` (double, optional) — The location latitude.
- `longitude` (double, optional) — The location longitude.
- `region` (string, optional) — The region for the location.
- `timezone` (string, optional) — The timezone for the location.

### ListMembersMarketingPermissionsItems

A single marketing permission a subscriber has either opted-in to or opted-out of.

- `enabled` (boolean, optional) — If the subscriber has opted-in to the marketing permission.
- `marketing_permission_id` (string, optional) — The id for the marketing permission on the list
- `text` (string, optional) — The text of the marketing permission.

### ListMembersMergeFields

This object's keys are merge tags (like FNAME). It's values are the values to be added to the merge field.

### ListMembersStats

Open and click rates for this subscriber.

- `avg_click_rate` (double, optional) — A subscriber's average clickthrough rate.
- `avg_open_rate` (double, optional) — A subscriber's average open rate.
- `ecommerce_data` (ListMembersStatsEcommerceData, optional) — Ecommerce stats for the list member if the list is attached to a store.

### ListMembersTagsItems

- `id` (integer, optional) — The tag id.
- `name` (string, optional) — The name of the tag

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaLocationLatitude

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaLocationLongitude

### 30ListsListIdMembersPostRequestBodyContentApplicationJsonSchemaMergeFields0

- `addr1` (string, required)
- `city` (string, required)
- `state` (string, required)
- `zip` (string, required)
- `addr2` (string, optional)
- `country` (string, optional)

### ListMembersMergeFields0

- `addr1` (string, required)
- `city` (string, required)
- `state` (string, required)
- `zip` (string, required)
- `addr2` (string, optional)
- `country` (string, optional)

### ListMembersStatsEcommerceData

Ecommerce stats for the list member if the list is attached to a store.

- `currency_code` (string, optional) — The three-letter ISO 4217 code for the currency that the store accepts.
- `number_of_orders` (double, optional) — The total number of orders placed by the list member.
- `total_revenue` (double, optional) — The total revenue the list member has brought in.

## Examples

**Request**

```json
{
  "email_address": "string",
  "status": "subscribed"
}
```

**Response**

```json
{
  "_links": [
    {
      "href": "string",
      "method": "GET",
      "rel": "string",
      "schema": "string",
      "targetSchema": "string"
    }
  ],
  "consents_to_one_to_one_messaging": true,
  "contact_id": "string",
  "email_address": "string",
  "email_client": "string",
  "email_type": null,
  "id": "string",
  "interests": {},
  "ip_opt": "string",
  "ip_signup": "string",
  "language": "string",
  "last_changed": "2024-01-15T09:30:00Z",
  "last_note": {
    "created_at": "2024-01-15T09:30:00Z",
    "created_by": "string",
    "note": "string",
    "note_id": 1
  },
  "list_id": "string",
  "location": {
    "country_code": "string",
    "dstoff": 1,
    "gmtoff": 1,
    "latitude": 1.1,
    "longitude": 1.1,
    "region": "string",
    "timezone": "string"
  },
  "marketing_permissions": [
    {
      "enabled": true,
      "marketing_permission_id": "string",
      "text": "string"
    }
  ],
  "member_rating": 1,
  "merge_fields": {},
  "sms_phone_number": "string",
  "sms_subscription_last_updated": "string",
  "sms_subscription_status": "subscribed",
  "source": "string",
  "stats": {
    "avg_click_rate": 1.1,
    "avg_open_rate": 1.1,
    "ecommerce_data": {
      "currency_code": "USD",
      "number_of_orders": 1.1,
      "total_revenue": 1.1
    }
  },
  "status": "subscribed",
  "tags": [
    {
      "id": 1,
      "name": "string"
    }
  ],
  "tags_count": 1,
  "timestamp_opt": "2024-01-15T09:30:00Z",
  "timestamp_signup": "2024-01-15T09:30:00Z",
  "unique_email_id": "string",
  "unsubscribe_reason": "string",
  "vip": true,
  "web_id": 1
}
```

**SDK Code**

```python
import requests

url = "https://api.mailchimp.com/3.0/lists/list_id/members"

payload = {
    "email_address": "string",
    "status": "subscribed"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://api.mailchimp.com/3.0/lists/list_id/members';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"email_address":"string","status":"subscribed"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.mailchimp.com/3.0/lists/list_id/members"

	payload := strings.NewReader("{\n  \"email_address\": \"string\",\n  \"status\": \"subscribed\"\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(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.mailchimp.com/3.0/lists/list_id/members")

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_address\": \"string\",\n  \"status\": \"subscribed\"\n}"

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

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.mailchimp.com/3.0/lists/list_id/members")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"email_address\": \"string\",\n  \"status\": \"subscribed\"\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.mailchimp.com/3.0/lists/list_id/members', [
  'body' => '{
  "email_address": "string",
  "status": "subscribed"
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.mailchimp.com/3.0/lists/list_id/members");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"email_address\": \"string\",\n  \"status\": \"subscribed\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "email_address": "string",
  "status": "subscribed"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.mailchimp.com/3.0/lists/list_id/members")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```

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