{"summary":{"total_blocks":40000,"occupied_blocks":6800,"available_blocks":33200,"block_size":5,"grid_dimensions":{"width":1000,"height":1000}},"prime_zones":[{"name":"center","minX":400,"maxX":600,"minY":400,"maxY":600,"description":"Prime real estate - center of the grid","available_blocks":940},{"name":"top_center","minX":400,"maxX":600,"minY":0,"maxY":200,"description":"High visibility - top center","available_blocks":1297},{"name":"left_center","minX":0,"maxX":200,"minY":400,"maxY":600,"description":"Left side prominent area","available_blocks":1350}],"sample_available":[{"x":495,"y":450},{"x":495,"y":455},{"x":495,"y":460},{"x":495,"y":465},{"x":495,"y":470}],"usage":{"tip":"Use filters to query specific areas, or add ?list=true for full list (large response)","examples":["GET /api/pixels/available?minX=400&maxX=600&minY=400&maxY=600 - Get center blocks","GET /api/pixels/available?minX=0&maxX=100&minY=0&maxY=100&list=true - Get corner blocks"]}}