Google Flow API v1 updates:

• POST /images now supports Nano Banana Pro / Gemini 3 Pro Image model (requires Google AI Ultra subscription)
• Enhanced 429 error responses to include metadata field with canUpgradeForQuota information for quota-related errors

Examples

• Generate images using nano-banana-pro with Ultra account POST images

curl --location 'https://api.useapi.net/v1/google-flow/images' \
--header 'Authorization: Bearer user:12345-…' \
--form 'prompt="Cat dressed like a pirate fencing with a real pirate, pirate looks absolutely terrified, this is happening on a deck of the Disney cruise ship"' \
--form 'model="nano-banana-pro"' \
--form 'aspectRatio="portrait"' \
--form 'count="4"' 

Result

• Edit images using nano-banana-pro with reference images POST images

Original

curl --location 'https://api.useapi.net/v1/google-flow/images' \
--header 'Authorization: Bearer user:12345-…' \
--form 'prompt="Make this photograph look modern"' \
--form 'model="nano-banana-pro"' \
--form 'aspectRatio="portrait"' \
--form 'count=""' \
--form 'reference_1="user:12345-email:…-image:…"' 

Result