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Documentation Index

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The request didn’t carry a valid letmepost API key. This is about your key — not the upstream platform token. For platform token issues see platform_auth_failed.

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What triggers it

  • No Authorization header.
  • Header doesn’t start with Bearer .
  • Key is unknown (typo, revoked, deleted org).
  • Key prefix doesn’t match the environment (e.g., lmp_test_… against the production base URL).

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Response shape

unauthenticated.json
{
  "error": {
    "code": "unauthenticated",
    "message": "Missing or invalid Authorization header.",
    "remediation": "Send 'Authorization: Bearer lmp_live_…' (or lmp_test_…) on every request.",
    "requestId": "req_..."
  }
}

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Remediation

  1. Mint or rotate a key in the dashboard’s API keys page.
  2. Confirm the prefix matches your environment.
  3. Confirm the key wasn’t revoked — revocation is immediate.