---
title: "Add subscribers to a list"
method: POST
path: "/lists/{list_id}/subscriptions"
tags: ["Lists"]
---

# Add subscribers to a list

`POST /lists/{list_id}/subscriptions`

Subscribes additional users to the list, without modifying existing subscriptions. If the list does not exist, it will be automatically created.

## Path parameters

- `list_id` string, required

## Headers

- `Idempotency-Key` string
- `x-idempotency-expiration` string

## Request body

- object
  - `recipients` PutSubscriptionsRecipient[], required
    - `recipientId` string, required
    - `preferences` RecipientPreferences
      - `categories` NotificationPreferences
      - `notifications` NotificationPreferences

## Response `202`

## Other responses

- `204`
- `400`

## Changes

- **2026-07-29** `f76bed79a913` — 2 info
  - added the new optional `header` request parameter `Idempotency-Key`
  - added the new optional `header` request parameter `x-idempotency-expiration`
- **2026-01-05** `361d17797dff` — 1 info
  - added the success response with the status `202`
- **2025-12-08** `59c9efb45644` — 1 breaking
  - removed the success response with the status `202`
- **2025-12-02** `b232056686e3` — 1 info
  - added the success response with the status `202`

[Change history](https://skmtc.dev/trycourier/apis/courier/changes/lists/:list_id/subscriptions/post.md)

---

[API](https://skmtc.dev/trycourier/apis/courier.md) · [All operations](https://skmtc.dev/trycourier/apis/courier/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/trycourier/courier/revisions/cb8586034158/schema)