---
title: "Build a company list from a contact list's companies"
method: POST
path: "/business/lists/{listId}/derive-company-list"
tags: ["Lists"]
---

# Build a company list from a contact list's companies

`POST /business/lists/{listId}/derive-company-list`

## Request

- Base URL: `https://api.tryfuse.ai/api/v1`
- URL: `https://api.tryfuse.ai/api/v1/business/lists/{listId}/derive-company-list`
- Auth: HTTP basic

Builds a new company list from the companies the contact list's rows belong to. Async: 202 returns the created list (in `processing` state) and `sourceContacts`, the number of contacts examined; poll `GET /business/lists/{listId}` on the new id until `completionStatus` is `complete`. A source list still being built answers 409 LIST_PROCESSING — retry once its own `completionStatus` leaves `processing`.

Errors:
- `404` `LIST_NOT_FOUND` — No source list with that id is visible to the token owner.
- `409` `LIST_NAME_TAKEN` — A list already carries the requested name.
- `409` `LIST_PROCESSING` — The source list is still being built; retry once its completionStatus leaves processing.
- `422` `CONTACT_LIST_REQUIRED` — The source list is a company list; companies are derived from a contact list's rows.
- `422` `LIST_EMPTY` — The source list has no contacts to derive companies from.
- `422` `INVALID_REQUEST` — CRM rejected the request for a reason outside the mapped set.
- `422` `VALIDATION_FAILED` — name missing/blank or over 255 characters, or an unknown body key.
- `429` `RATE_LIMITED` — The lists rate bucket (120 requests/minute, 10,000/day per token owner) is exhausted.

Requires one of the following token scopes: lists.

## Path parameters

- `listId` string, required: 24-character hex id of the list (from GET /business/lists).

## Request body

- object
  - `name` string, required: Name for the new company list (1-255 characters); a name already in use answers 409 LIST_NAME_TAKEN.

## Response `202`

Success

- object
  - `list` object, required
    - `id` string, required
    - `name` string, required
  - `sourceContacts` integer, nullable, required

## Other responses

- `400`: Error
- `401`: Error
- `402`: Error
- `403`: Error
- `404`: Error
- `409`: Error
- `422`: Error
- `429`: Error
- `500`: Error

---

[API](https://skmtc.dev/fuseai/apis/fuse-business-api.md) · [All operations](https://skmtc.dev/fuseai/apis/fuse-business-api/llms.txt) · [OpenAPI document](https://skmtc.dev/fuseai/apis/fuse-business-api/revisions/50d95e0536f4?raw)