---
title: "Get sender usage data"
method: GET
path: "/v1/sender_identities/{sender_id}/used_by"
tags: ["Sender Identities"]
---

# Get sender usage data

`GET /v1/sender_identities/{sender_id}/used_by`

## Request

- Base URL: `https://api.customer.io`
- URL: `https://api.customer.io/v1/sender_identities/{sender_id}/used_by`
- Auth: HTTP bearer

Returns lists of the automations and one-time sends that use a sender.

## Response `200`

Returns arrays of automations and one-time sends.

- object
  - `campaigns` integer[]: The automations that use the sender.
  - `sent_newsletters` integer[]: The one-time sends you've sent that used the sender.
  - `draft_newsletters` integer[]: The one-time send drafts that are set up using the sender.

## Other responses

- `404`: The sender does not exist.
- `429`: Your request is over the 10-per-second limit. `Retry-After` tells you how many seconds you must wait before you send the next request.

## Changes

- **2026-09-02** `5da2740beeb5`: 1 info
  - added the media type `application/json` for the response with the status `429`

[Operation history](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/changes/v1/sender_identities/:sender_id/used_by/get.md)

---

[API](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference.md) - [All operations](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/llms.txt) - [OpenAPI document](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/revisions/ac0b282053fe?raw)