---
title: "Activate a Sequence"
method: POST
path: "/emailer_campaigns/{sequence_id}/approve"
tags: ["Sequences"]
---

# Activate a Sequence

`POST /emailer_campaigns/{sequence_id}/approve`

This endpoint doesn't consume Apollo credits. Learn more about [API pricing and credits](https://docs.apollo.io/docs/api-pricing).

<a href="https://knowledge.apollo.io/hc/en-us/articles/4409237165837-Sequences-Overview" target="_blank">Sequences</a> are outreach campaigns that sales teams use to reach out to contacts over a planned period of time.<br><br>Use the Activate a Sequence endpoint to start an inactive sequence. Once activated, the sequence begins sending emails to its contacts on the configured schedule. The sequence must have at least one step configured before it can be activated.<br><br>This endpoint requires a master API key. If you call the endpoint without a master key, you receive a `403` response. Check out <a href="https://docs.apollo.io/docs/create-api-key">Create an API Key</a> to learn how to create a master key.

## Path parameters

- `sequence_id` string, required

## Response `200`

200

- object
  - `emailer_campaign` object
    - `id` string
    - `unique_scheduled` integer
    - `active` boolean
  - `emailer_steps` object[]
    - `id` string
    - `emailer_campaign_id` string
    - `position` integer
    - `wait_time` integer
    - `type` string
    - `note` string, nullable

## Other responses

- `401` — 401
- `403` — 403
- `422` — 422
- `429` — 429

---

[API](https://skmtc.dev/apollo/apis/apollo-rest-api.md) · [All operations](https://skmtc.dev/apollo/apis/apollo-rest-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/apollo/apollo-rest-api/revisions/c715a05fa6e2/schema)