Free DeepSeek V4 Pro API

curl https://integrate.api.nvidia.com/v1/chat/completions \
  -H "Authorization: Bearer $NVIDIA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-ai/deepseek-v4-pro-0813",
    "messages": [{"role": "user", "content": "Refactor this distributed Raft implementation."}]
  }'