LLM Authentication

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"

Header by API format

Compatible API	Header
Claude API	`x-api-key: $APIXO_API_KEY`
OpenAI Responses API	`Authorization: Bearer $APIXO_API_KEY`
Gemini API	`x-goog-api-key: $APIXO_API_KEY`

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

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.

Gemini API LLM Streaming

Getting Started

Compatible APIs

Reference

LLM Authentication

Header by API format

Claude required version header

Example

​Header by API format

​Claude required version header

​Example

Header by API format

Claude required version header

Example