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Documentation Index

Fetch the complete documentation index at: https://docs.letterbucket.com/llms.txt

Use this file to discover all available pages before exploring further.

LetterBucket’s writing assistant can use your own AI provider API keys instead of the built-in AI. This gives you full control over which model you use and how costs are handled. Go to Settings → Profile → API Keys to manage your keys.

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Supported providers

ProviderKey format
OpenAIStarts with sk- or sk-proj-
DeepSeekStarts with sk-
OpenRouterStarts with sk-or-v1-
OpenRouter is a good choice if you want access to many different models (including Claude, Gemini, Llama, and others) through a single API key.

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Adding an API key

  1. Go to Settings → Profile → API Keys.
  2. Select your provider.
  3. Paste your API key. LetterBucket validates the key format before saving.
  4. Save.
Once saved, the writing assistant in the editor will use your key for AI-powered features.

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Using the writing assistant

With a key connected, you can access AI assistance directly in the post editor:
  • Select any text and use the AI actions in the formatting toolbar.
  • Use the / insert menu to trigger AI-powered content generation.
  • The assistant can help you rewrite, expand, summarize, or improve your writing.

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Removing a key

Click Delete next to any key to remove it. The writing assistant will fall back to LetterBucket’s built-in AI if it’s available on your plan.
Your API keys are stored securely but treat them like passwords — don’t share them. If a key is compromised, revoke it in your provider’s dashboard and add a new one here.