---
title: "Create Suppression List"
method: POST
path: "/v1/batch/suppression-lists"
tags: ["Cost Control"]
---

# Create Suppression List

`POST /v1/batch/suppression-lists`

Create a new suppression list with initial emails. Emails are SHA-256 hashed server-side.

## Request body

- object
  - `list_id` string, required
  - `emails` string[], required

## Response `201`

Suppression list created.

- SuppressionList
  - `list_id` string
  - `count` integer
  - `created_at` string, date-time

## Other responses

- `400` — Bad Request - The request was malformed or contains invalid parameters. **Common causes:** - Missing required fields - Invalid field format (e.g., malformed email) - Invalid JSON syntax - Invalid parameter values
- `401` — Unauthorized - Authentication failed. **Common causes:** - Missing X-API-Key header - Invalid or expired API key - Malformed API key

---

[API](https://skmtc.net/leadmagic/apis/leadmagic-api.md) · [All operations](https://skmtc.net/leadmagic/apis/leadmagic-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/leadmagic/leadmagic-api/revisions/aa19cf9bc46a/schema)