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API keys let external tools and integrations manage your newsletter through the LetterBucket Public API — for example creating subscribers from your own website or syncing your audience with other services. Manage your keys at Settings → Newsletter → API Keys.
API access is a plan-gated feature and requires settings management permission. If the API Keys section appears disabled, check your plan or your role in the newsletter.
These keys are for the Public API. They’re different from the AI provider keys under Settings → Profile → API Keys, which connect your own AI models to the writing assistant.

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The API Keys page

  • API Base URL — the base URL for all API requests to this newsletter, with a Copy button.
  • Documentation — a shortcut to the API reference.
  • API Keys — your list of keys, showing how many active keys you have out of your maximum.

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Creating a key

  1. Click Create API Key.
  2. Give it a name that identifies the integration (e.g. “My Integration”).
  3. The new key is shown only once — copy it and store it somewhere safe.
Each key is scoped to the newsletter it was created in: it cannot read or modify data from any other newsletter.

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Revoking and deleting keys

Each key in the list has two actions:
ActionEffect
Revoke KeyDeactivates the key — any integration using it stops working immediately
Delete KeyRemoves the key from your list entirely
Treat API keys like passwords. If a key leaks, revoke it immediately and create a new one.