Use RunComfy's API to run kling/kling-v4/image-to-video. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/kling/kling-v4/image-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"start_image_url": "",
"prompt": ""
}'Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.
Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/kling/kling-v4/image-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"start_image_url": "",
"prompt": ""
}'Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
--header "Authorization: Bearer <token>"Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
--header "Authorization: Bearer <token>"Cancel a queued job by request_id; in-progress jobs cannot be cancelled.
curl --request POST \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
--header "Authorization: Bearer <token>"Provide a publicly reachable HTTPS URL. Ensure the host allows server-side fetches (no login/cookies required) and isn't rate-limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre-signed URLs for private assets.
{
"type": "object",
"title": "Input schema",
"required": [
"start_image_url",
"prompt"
],
"properties": {
"start_image_url": {
"title": "Start Image",
"description": "Opening frame. JPEG or PNG. The output frame follows this image.",
"type": "string",
"examples": [
"https://playgrounds-storage-public.runcomfy.net/tools/7478/media-files/promo-input.webp"
]
},
"prompt": {
"title": "Prompt",
"description": "Describe the motion, the camera, and the sound after the opening frame.",
"type": "string",
"examples": [
"The camera cranes upward from the yellow and pink facades to the green copper spire and the pale sky. A few pigeons cross the frame. Audio: a distant bell, low street murmur, no music."
]
},
"middle_image_urls": {
"title": "Middle Images",
"description": "Optional ordered frames between the opening and the close. Eight at most. Counted with the start and end images, the total is ten.",
"type": "array",
"maxItems": 8,
"items": {
"type": "string",
"format": "image_uri"
}
},
"end_image_url": {
"title": "End Image",
"description": "Optional last frame. Leave empty to let the clip end on its own.",
"type": "string"
},
"duration": {
"title": "Duration",
"description": "Clip length in whole seconds. The default is 5.",
"type": "integer",
"minimum": 3,
"maximum": 30,
"default": 5
},
"resolution": {
"title": "Resolution",
"description": "Output resolution. 1080p is the default. 720p is the lighter pass.",
"type": "string",
"enum": [
"720p",
"1080p"
],
"default": "1080p"
}
}
}{
"output": {
"type": "object",
"properties": {
"image": {
"type": "string",
"format": "uri",
"description": "single image URL"
},
"video": {
"type": "string",
"format": "uri",
"description": "single video URL"
},
"images": {
"type": "array",
"description": "multiple image URLs",
"items": {
"type": "string",
"format": "uri"
}
},
"videos": {
"type": "array",
"description": "multiple video URLs",
"items": {
"type": "string",
"format": "uri"
}
}
}
}
}RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.