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Create an Account

  1. Go to api.hitheo.ai
  2. Sign up with your email or social login
  3. You’ll land on the API dashboard

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Generate a Key

  1. Navigate to API Keys in the sidebar
  2. Click Create Key
  3. Give your key a descriptive name (e.g., “Production”, “Development”)
  4. Copy the key immediately — it won’t be shown again
Your key will look like: 
theo_sk_a1b2c3d4e5f6...
Store your API key securely. Never commit it to source control or expose it in client-side code. Use environment variables instead.

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Set the Environment Variable

export THEO_API_KEY=theo_sk_a1b2c3d4e5f6...
Or add it to your .env file: 
THEO_API_KEY=theo_sk_a1b2c3d4e5f6...

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Verify It Works

curl https://hitheo.ai/api/v1/health
This endpoint is public (no auth required) and returns system status. To verify your key specifically: 
curl https://hitheo.ai/api/v1/models \
  -H "Authorization: Bearer $THEO_API_KEY"
You should get back a list of available Theo engine models.

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Key Format

All API keys use the theo_sk_ prefix. Keys are production keys — all usage is billed against your credit balance.

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Next Steps

Make Your First Call

Send your first completion request with curl.

Install the SDK

Set up the TypeScript SDK for a better developer experience.