Midjourney API v2 updated to return upscaled video URLs for Ux buttons when using --video, see videoUx in GET jobs/jobid. Prompt length extended to 5K character from 2048 in POST jobs/imagine.

Example

https://…/bird.webp

curl --location 'https://api.useapi.net/v2/jobs/imagine' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer user:12345-…' \
--data '{
    "prompt": "https://…/bird.webp Tweety Bird spins kettlebell with one hand around once and hurls the kettlebell directly at the camera in a slow motion --iw 2 --ar 3:2 --motion low --video"
}'
Response JSON 
{
    "jobid": "job:20250822143812123-user:12345-channel:1122334455667788990-bot:midjourney",
    "verb": "imagine",
    "status": "completed",
    "created": "2025-08-22T14:38:12.123Z",
    "updated": "2025-08-22T14:40:05.889Z",
    "prompt": "https://modern.art/abcdef/bird.webp Tweety Bird spins kettlebell with one hand around once and hurls the kettlebell directly at the camera in a slow motion --iw 2 --ar 3:2 --motion low --video",
    "replyRef": "2025-08-22T14:38:10.456Z",
    "replyUrl": "https://webhook.site/b4d8e1a0-5c6f-4a3b-9e1d-f8c7b6a5d4e3",
    "channel": "1122334455667788990",
    "maxJobs": 3,
    "discord": "NDE...secured...ABC",
    "messageId": "1522889900112233445",
    "content": "**<https://s.mj.run/aBcDeF-ghIj> https://fluxpro.ai/abcdef/bird.webp Tweety Bird spins kettlebell with one hand around once and hurls the kettlebell directly at the camera in a slow motion --iw 2 --ar 3:2 --motion low --video 1** - <@987654321098765432> [(Open on website for full quality)](<https://midjourney.com/jobs/b4d8e1a0-5c6f-4a3b-9e1d-f8c7b6a5d4e3>) (fast)",
    "timestamp": "2025-08-22T14:39:55.777000+00:00",
    "attachments": [
        {
            "proxy_url": "https://media.discordapp.net/attachments/….webp?ex=…&is=…&hm=…&",
            "height": 768,
            "content_type": "image/webp",
            "placeholder": "…",
            "placeholder_version": 1,
            "filename": "….webp",
            "size": 3105492,
            "url": "https://cdn.discordapp.com/attachments/….webp?ex=…&is=…&hm=…&",
            "width": 512,
            "flags": 32,
            "content_scan_version": 2,
            "id": "1522889900112233445"
        }
    ],
    "buttons": [
        "U1",
        "U2",
        "U3",
        "U4",
        "🔄"
    ],
    "videoUx": [
        {
            "id": 1,
            "url": "https://cdn.midjourney.com/video/b4d8e1a0-5c6f-4a3b-9e1d-f8c7b6a5d4e3/0.mp4"
        },
        {
            "id": 2,
            "url": "https://cdn.midjourney.com/video/b4d8e1a0-5c6f-4a3b-9e1d-f8c7b6a5d4e3/1.mp4"
        },
        {
            "id": 3,
            "url": "https://cdn.midjourney.com/video/b4d8e1a0-5c6f-4a3b-9e1d-f8c7b6a5d4e3/2.mp4"
        },
        {
            "id": 4,
            "url": "https://cdn.midjourney.com/video/b4d8e1a0-5c6f-4a3b-9e1d-f8c7b6a5d4e3/3.mp4"
        }
    ],
    "code": 200
}

Result