---
title: "Retrieve read-only subscriber system fields available for filtering."
method: GET
path: "/internal/subscriber-system-fields"
tags: ["Subscriber system fields"]
---

# Retrieve read-only subscriber system fields available for filtering.

`GET /internal/subscriber-system-fields`

## Request

- Base URL: `https://api.maildroppa.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.maildroppa.com/internal/subscriber-system-fields`
- Auth: API key in header `X-API-Key`

## Response `200`

System field catalog returned.

- unknown

## Other responses

- `401`: Not Authorized
- `403`: Not Allowed
- `428`: Accept the customer agreements in the app before using API keys.

---

[API](https://skmtc.dev/maildroppa/apis/maildroppa-api-beta.md) · [All operations](https://skmtc.dev/maildroppa/apis/maildroppa-api-beta/llms.txt) · [OpenAPI document](https://skmtc.dev/maildroppa/apis/maildroppa-api-beta/revisions/a9f5a3fd1fb0?raw)