---
title: "Send a message to multiple participants"
method: POST
path: "/api/v1/messages/bulk/"
tags: ["messages"]
---

# Send a message to multiple participants

`POST /api/v1/messages/bulk/`

Send a message to multiple participants.

## Headers

- `Authorization` string, required

## Request body

- SendBulkMessage
  - `ids` string[], required — A list of participant ID's
  - `body` string, required — Message Body. Text is sanitised for safe storage and display.
  - `study_id` string, required — A study ID

## Response `204`

The message has been sent

- object

## Other responses

- `400` — Error

---

[API](https://skmtc.net/prolific/apis/api-reference.md) · [All operations](https://skmtc.net/prolific/apis/api-reference/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/prolific/api-reference/versions/5c53371c41a0/schema)