AssemblyAI API Key Tester

Test any AI or API key in your browser — instantly see if it's valid, and why it isn't. Nothing is stored.

Test your AssemblyAI API key with the transcript list endpoint

Data verified 2026-07-13

Key format & how to get one

Example: abc123...(32 hex) AssemblyAI keys are hexadecimal strings sent in the Authorization header with no Bearer prefix. 1. Sign in at https://www.assemblyai.com 2. Copy your API key from the dashboard 3. New accounts include free credit

How to test

  1. Copy your key from the AssemblyAI dashboard.
  2. Paste it into the tester above and click Test Key.
  3. Green means valid; red shows the exact error and fix.

Common errors

CauseFix
Invalid or revoked key.Copy the key from your AssemblyAI dashboard; send it as 'Authorization: <key>' (no Bearer).

AssemblyAI API docs →

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