> ## Documentation Index
> Fetch the complete documentation index at: https://docs.transmuter.3mergen.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Keys

> Manage your BYOK API key and connected service credentials.

If you are using BYOK (Bring Your Own Key) mode, you need to provide your own Anthropic API key. This page explains how to set it up and manage it.

## Setting up your Anthropic API key

<Steps>
  <Step title="Get an API key from Anthropic">
    Visit [console.anthropic.com](https://console.anthropic.com) and create an account if you do not have one. Navigate to **API Keys** and create a new key.

    <Warning>
      Copy your API key immediately after creating it -- Anthropic only shows it once. Store it somewhere safe.
    </Warning>
  </Step>

  {" "}

  <Step title="Add it to Transmuter">
    In Transmuter, go to **Settings > BYOK API Key**. Paste your Anthropic API key and click **Save**.
  </Step>

  <Step title="Verification">
    Transmuter validates your key by making a small test request. If the key is valid, you will see a green checkmark. If not, double-check that you copied the full key.
  </Step>
</Steps>

## How your API key is used

When BYOK mode is active, Transmuter uses your Anthropic API key for all AI operations during Plan Casts. This means:

* AI usage is billed directly to your Anthropic account
* You have full visibility into token usage and costs via the Anthropic dashboard
* Your Transmuter subscription covers only the platform fee (lower than Default mode)

<Note>
  Your API key is encrypted and stored securely. Transmuter never displays your full key after you
  save it -- only the last 4 characters are shown for identification.
</Note>

## Managing connected service credentials

Your cloud service connections (GitHub, Vercel, Convex) are managed separately from your BYOK API key. To manage those, go to **Settings > Connected Accounts**. See [Connecting Cloud Accounts](/journeys/deploying/connecting-accounts) for details.

## Rotating your API key

If you need to update your API key (for example, after rotating it on Anthropic's side):

1. Go to **Settings > BYOK API Key**
2. Click **Update Key**
3. Paste the new key
4. Click **Save**

The new key takes effect immediately for any future Plan Casts. In-progress Plan Casts continue using the key that was active when they started.

<Snippet file="support-cta.mdx" />