---
title: "Add companies to a company exclusion list"
method: POST
path: "/v1/exclusions/companies/add-to-list"
tags: ["Exclusions"]
---

# Add companies to a company exclusion list

`POST /v1/exclusions/companies/add-to-list`

## Request

- Base URL: `https://api.fiber.ai`
- URL: `https://api.fiber.ai/v1/exclusions/companies/add-to-list`
- Auth: none declared

Add companies to a company exclusion list

<span>⚡ <strong>Rate limit:</strong> 120 requests per 1 minute</span>

<span>💰 <strong>Cost:</strong> FREE! No credits are charged for this API.&nbsp;<span title="Pricing shown is default pricing. Actual pricing may vary.">ⓘ</span></span>

## Request body

- object
  - `apiKey` string, required: Your Fiber API key
  - `listId` string, required: The ID of the company exclusion list to add companies to.
  - `companies` object[], required: The companies to add to the exclusion list. A maximum of 5000 companies can be added at a time. Each entry needs a domain or a LinkedIn company URL; invalid entries are skipped and reported in the response without failing the request.
    - `domain` string, nullable: A company domain, like 'example.com'.
    - `linkedinUrl` string, nullable: A LinkedIn company URL, like 'https://www.linkedin.com/company/google'.

## Response `200`

Default Response

- object
  - `output` object, required
    - `listId` string, required: The ID of the company exclusion list.
    - `companiesAdded` number, required: Number of companies added to the exclusion list
    - `invalidIdentifiers` object[], required: Entries that could not be added because they had no valid company domain or LinkedIn company URL. Valid entries in the same request are still added.
      - `input` object, required: The original entry as submitted.
        - `domain` string, nullable
        - `linkedinUrl` string, nullable
      - `reason` string, required: The specific reason this entry could not be added.
  - `chargeInfo` union, required
    - object: Credits were charged immediately for this operation
      - `method` 'charged-now', required
      - `creditsCharged` number, required
      - `lowCreditAlert` object, nullable: Contains a link to get more credits, a warning message, and the remaining credit count.
        - `getMoreCreditsUrl` string, uri, required: URL to top up credits or restart billing cycle to get fresh credits.
        - `message` string, required: Human-readable credits warning.
        - `availableCredits` number, required: Number of credits remaining in the current billing period.
    - object: Credits will be charged after the operation completes
      - `method` 'charging-later', required
      - `message` string, required
      - `lowCreditAlert` object, nullable: Contains a link to get more credits, a warning message, and the remaining credit count.
        - `getMoreCreditsUrl` string, uri, required: URL to top up credits or restart billing cycle to get fresh credits.
        - `message` string, required: Human-readable credits warning.
        - `availableCredits` number, required: Number of credits remaining in the current billing period.
    - object: Credits that were charged for an asynchronous operation
      - `method` 'charged-for-async-process', required
      - `creditsCharged` number, required
      - `message` string, required
      - `lowCreditAlert` object, nullable: Contains a link to get more credits, a warning message, and the remaining credit count.
        - `getMoreCreditsUrl` string, uri, required: URL to top up credits or restart billing cycle to get fresh credits.
        - `message` string, required: Human-readable credits warning.
        - `availableCredits` number, required: Number of credits remaining in the current billing period.
    - object: No credits were charged for this operation
      - `method` 'free', required
      - `message` string, required
      - `lowCreditAlert` object, nullable: Contains a link to get more credits, a warning message, and the remaining credit count.
        - `getMoreCreditsUrl` string, uri, required: URL to top up credits or restart billing cycle to get fresh credits.
        - `message` string, required: Human-readable credits warning.
        - `availableCredits` number, required: Number of credits remaining in the current billing period.
    - object: Credits were refunded for this operation
      - `method` 'credits-refunded', required
      - `creditsRefunded` number, required
      - `message` string, required
      - `lowCreditAlert` object, nullable: Contains a link to get more credits, a warning message, and the remaining credit count.
        - `getMoreCreditsUrl` string, uri, required: URL to top up credits or restart billing cycle to get fresh credits.
        - `message` string, required: Human-readable credits warning.
        - `availableCredits` number, required: Number of credits remaining in the current billing period.
  - `warnings` object[], nullable: Warnings about extraneous fields in request
    - `field` string, required: Full path to extraneous field (e.g., 'searchParams.ExtraField')
    - `message` string, required: Warning message
  - `advice` string[], nullable: Tips, recommendations, and suggestions for using this API effectively.

## Other responses

- `400`: Default Response
- `401`: Default Response
- `402`: Default Response
- `403`: Default Response
- `404`: Default Response
- `422`: Default Response
- `429`: Default Response
- `500`: Default Response
- `503`: Default Response

## Changes

- **2026-07-31** `4002aa81d4fb`: 2 breaking, 1 info
  - the response property `advice` became nullable for the status `200`
  - the response property `advice` became optional for the status `200`
  - the `advice` response's property default value `` was removed for the status `200`
- **2026-07-13** `f14ac2efab0c`: 2 info
  - added the non-success response with the status `422`
  - added the required property `advice` to the response with the `200` status

[Operation history](https://skmtc.dev/fiber/apis/fiber-ai-api/changes/v1/exclusions/companies/add-to-list/post.md)

---

[API](https://skmtc.dev/fiber/apis/fiber-ai-api.md) - [All operations](https://skmtc.dev/fiber/apis/fiber-ai-api/llms.txt) - [OpenAPI document](https://skmtc.dev/fiber/apis/fiber-ai-api/revisions/d8237cb5c35e?raw)