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LLM Gateway requests use your APIXO API key. The header name follows the compatible provider API so existing SDKs and tools can keep their normal request format. Create a key in the APIXO dashboard, then store it as APIXO_API_KEY. 
export APIXO_API_KEY="your_apixo_api_key"

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Header by API format

Compatible APIHeader
Claude APIx-api-key: $APIXO_API_KEY
OpenAI Responses APIAuthorization: Bearer $APIXO_API_KEY
Gemini APIx-goog-api-key: $APIXO_API_KEY

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Claude required version header

Claude-compatible requests also require the Anthropic protocol version header. Most Claude SDKs add this automatically. 
anthropic-version: 2023-06-01

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Example

curl -X POST "https://llm.apixo.ai/v1/messages" \
  -H "x-api-key: $APIXO_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 128,
    "messages": [{"role": "user", "content": "Say hello."}]
  }'
Do not expose APIXO keys in browser-side code. Make LLM Gateway calls from your backend, serverless function, or trusted runtime.