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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.

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Setting up your Anthropic API key

1

Get an API key from Anthropic

Visit console.anthropic.com and create an account if you do not have one. Navigate to API Keys and create a new key.
Copy your API key immediately after creating it — Anthropic only shows it once. Store it somewhere safe.
2

Add it to Transmuter

In Transmuter, go to Settings > BYOK API Key. Paste your Anthropic API key and click Save.
3

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.

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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)
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.

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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 for details.

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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.