Qwen3 4B Instruct API Docs

Open playground

https://qwen3.ai-api.ancbd.com/v1

qwen3-4b-instruct

Authorization: Bearer YOUR_QWEN3_API_KEY

Health

curl https://qwen3.ai-api.ancbd.com/health

Chat completion

curl https://qwen3.ai-api.ancbd.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_QWEN3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen3-4b-instruct",
    "messages": [
      {"role": "system", "content": "You are a concise customer support assistant. Answer only from context."},
      {"role": "user", "content": "Context: Refunds are available within 7 days. Question: How long can I request a refund?"}
    ],
    "temperature": 0.2,
    "top_p": 0.8,
    "max_tokens": 512,
    "stream": false
  }'

Recommended RAG settings

{
  "temperature": 0.2,
  "top_p": 0.8,
  "max_tokens": 512,
  "stream": true
}