What headers does OpenAI require?

OpenAI requires Authorization: Bearer YOUR_KEY and Content-Type: application/json.

What headers does Anthropic Claude require?

Claude requires x-api-key: YOUR_KEY, anthropic-version: 2023-06-01, and Content-Type: application/json.

Is my API key stored anywhere?

No. Your API key is only used in your browser to build the header preview. It is never sent to any server.

AI API Headers Builder

Generate correct authentication headers for AI API providers.

Select your AI API provider and enter an API key to generate the correct authentication headers. Outputs ready-to-copy header block and cURL flags for OpenAI, Claude, Gemini, and LLaMA (Ollama). API keys are never stored.

Provider

API Key (not stored, used locally)

Headers (2)

Authorization:Bearer YOUR_API_KEY

Content-Type:application/json

cURL Flags

-H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json'

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FAQ

What headers does OpenAI require?: OpenAI requires Authorization: Bearer YOUR_KEY and Content-Type: application/json.
What headers does Anthropic Claude require?: Claude requires x-api-key: YOUR_KEY, anthropic-version: 2023-06-01, and Content-Type: application/json.
Is my API key stored anywhere?: No. Your API key is only used in your browser to build the header preview. It is never sent to any server.