{"name":"mobile-story-image-expand","description":"Expands existing images into tall story, reel-cover, and short-form promotional canvases. Same image-expand backend. Use it as a mobile story image expand API, vertical social outpaint, or Instagram TikTok story extender.","price":"$0.15","method":"POST","input_schema":{"properties":{"image_url":{"type":"string","description":"Source image URL to expand."},"canvas_width":{"type":"number","description":"Target canvas width in pixels. 256-4096."},"canvas_height":{"type":"number","description":"Target canvas height in pixels. 256-4096."},"original_width":{"type":"number","description":"Width of the original image within the new canvas. Optional; must pair with original_height."},"original_height":{"type":"number","description":"Height of the original image within the new canvas. Optional; must pair with original_width."},"original_x":{"type":"number","description":"X offset of the original image within the new canvas. Optional; must pair with original_y."},"original_y":{"type":"number","description":"Y offset of the original image within the new canvas. Optional; must pair with original_x."},"prompt":{"type":"string","description":"Text hint describing what to generate in the expanded area. Optional."},"seed":{"type":"number","description":"Random seed for reproducible output. Optional; random if omitted."}},"required":["image_url","canvas_width","canvas_height"]},"input_example":{"image_url":"https://storage.googleapis.com/falserverless/model_tests/orange.png","canvas_width":1080,"canvas_height":1920,"prompt":"extend background naturally for mobile story layout"},"output_example":{"image_url":"https://...png","width":1080,"height":1920},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}