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POST
/
api
/
v3
/
google
/
nano-banana
/
text-to-image
gemini-2.5-flash-image-preview (text to image)
curl --request POST \
  --url https://api.example.com/api/v3/google/nano-banana/text-to-image
Gemini’s nano banana for the text to image API. 
curl -X POST "https://gptproto.com/api/v3/google/nano-banana/text-to-image" \
  -H "Authorization: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "Draw a cat",
  "aspect_ratio": "3:2",
  "output_format": "png",
  "enable_sync_mode": false,
  "enable_base64_output": false
}'

{
  "error": {
    "message": "Invalid signature",
    "type": "401"
  }
}

​
Parameters

ParameterTypeRequiredDefaultDescription
promptstring✅ YesDraw a catPrompt parameter
aspect_ratiostring❌ No3:2Aspect Ratio parameter
output_formatstring❌ NopngOutput Format parameter
enable_sync_modeboolean❌ NofalseEnable Sync Mode parameter
enable_base64_outputboolean❌ NofalseEnable Base64 Output parameter