Seedance 2.5 · API

Quick start

Three steps: submit a job, poll it, take the video link. Replace YOUR_API_KEY with your key and the commands below run as they are.

Step 1 · Submit (returns a job id at once, HTTP 202)

curl https://kovapi.com/v1/videos/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "seedance-2.5", "prompt": "A paper boat drifts down a neon-lit street on a rainy night, low camera following it, crisp splashes and reflections", "duration": 5, "resolution": "720P", "size": "16:9"}'

Response (HTTP 202)

{
  "id": "img_5c2e8f1a9b3d7e6f0a4c8b2d",
  "object": "video.generation.job",
  "status": "queued",
  "created": 1791281400,
  "model": "seedance-2.5"
}

Step 2 · Poll every 5–10 seconds until status is succeeded or failed

curl https://kovapi.com/v1/videos/jobs/img_5c2e8f1a9b3d7e6f0a4c8b2d \
  -H "Authorization: Bearer YOUR_API_KEY"

Response when it succeeds

{
  "id": "img_5c2e8f1a9b3d7e6f0a4c8b2d",
  "object": "video.generation.job",
  "status": "succeeded",
  "created": 1791281400,
  "model": "seedance-2.5",
  "data": [
    {"url": "https://img.kovapi.com/i/8c1f0e5d2b7a49e3a6d0c4f1b9e2a7d5.mp4"}
  ],
  "usage": {"clips": 1, "model": "seedance-2.5"}
}

Step 3 · data[0].url is the clip (MP4). It is kept for 15 days; download it to your own storage to keep it longer.

Complete example (Python: submit, wait, save to disk)

import time
import requests

BASE = "https://kovapi.com/v1"
HEADERS = {"Authorization": "Bearer YOUR_API_KEY"}

# 1. submit
job = requests.post(f"{BASE}/videos/generations", headers=HEADERS, json={
    "model": "seedance-2.5",
    "prompt": "A paper boat drifts down a neon-lit street on a rainy night, low camera following it, crisp splashes and reflections",
    "duration": 5,
    "resolution": "720P",
    "size": "16:9",
}).json()
if "error" in job:
    raise SystemExit(job["error"]["message"])

# 2. poll every 10 seconds, for up to an hour
deadline = time.time() + 3600
while job["status"] not in ("succeeded", "failed") and time.time() < deadline:
    time.sleep(10)
    job = requests.get(f"{BASE}/videos/jobs/{job['id']}", headers=HEADERS).json()

# 3. download the video
if job["status"] == "succeeded":
    url = job["data"][0]["url"]
    with open("seedance-2.5.mp4", "wb") as f:
        f.write(requests.get(url).content)
    print("saved", url)
elif job["status"] == "failed":
    print("failed:", job["error"]["code"], job["error"]["message"])
else:
    print("still", job["status"], job["id"])

While queued, the poll also returns queue_position (jobs ahead of yours) and eta_seconds (expected wait). If your time limit passes, do not resubmit: the job is still there, so keep polling the same id later.

Authentication

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Create an API Key in the console to start.

At a glance

Request parameters

The JSON body of POST /v1/videos/generations:

Other fields (seed, negative_prompt, fps, watermark and the like) are not passed on and do not change the price; results are always MP4, returned as a url.

Price

Billed per second: cost = the per-second rate of the chosen resolution × the seconds you order. That amount is held at submit, settled as is on success and refunded in full on failure. 1 credit = $0.005.

Reference material

• Up to 30 reference images set the subject, scene, product and style. Seedance never uses an image as a frame: to bring the people or objects of a picture into the clip, name it in the prompt (@Image1, @Image2 … in the order you send them).
• Up to 10 reference videos (30 s in total) set motion, camera and pacing; up to 10 reference audio clips (each at most 30 s; a 30.1 s clip is refused) set a voice or music and must come with an image or a video. All three can go in one request; name them @Image1 / @Video1 / @Audio1.
• AI-generated characters work fine; photos of real people may be rejected upstream (real-face support is not listed for this model). For real people use the seedance-2.0 models or seedance-2.5-30s.
• Each image is a public image URL, a data: URI or base64, up to 16 MB; send several as an array in images. We store the images before the job is queued; one that cannot be read is refused with 400, message says which, and nothing is charged.
• Reference files we store are kept for 7 days; results for 15 days.

Reference images and a reference video together

curl https://kovapi.com/v1/videos/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "seedance-2.5", "prompt": "The girl from @Image1 dances the routine from @Video1 on the street from @Image2", "images": ["https://example.com/character.png", "https://example.com/street.png"], "video_references": ["https://example.com/dance.mp4"], "duration": 5, "size": "16:9"}'

@Image1 is the first reference image and @Video1 the first reference video. Reference videos are not billed; only the clip length is.

Job status and fields

GET /v1/videos/jobs/{id} reports these statuses; every field is described in Async jobs. Poll every 5–10 seconds, or let a webhook (below) push the result. Polling is free, and any key of the same account can read the job.

• processing can go back to queued, for example while the service is busy, while a finished clip is fetched again, or after a restart. If a job cannot be finished, the gateway may render it again automatically; however many retries it takes, a job is charged once.
• One account runs up to 50 jobs at a time; further jobs wait in submission order, and a job that has not started after 15 minutes fails and is refunded in full. Job records are kept for 3 days and video links for 15 days.

How long it takes

Usually 4–10 minutes from submit to result; longer clips and higher resolutions take longer, and so do busy hours.

Real calls over the last 7 days: median 8 min, 90% done within 20.1 min.

Errors and refunds

An error at submit comes back at once as HTTP 4xx / 5xx: no job is created and nothing is charged. A failure after the job was accepted is reported by the job endpoint, and the hold is refunded in full. Every code is listed under Error codes.

Errors at submit

Failed jobs (status failed)

Branch on code, not on the text of message. Treat any code you do not recognise (or a missing one) as upstream_error: resubmitting usually works. Every failed job is refunded in full.

Webhooks instead of polling

Add callback_url when you submit and the moment the job ends, success or failure, the gateway pushes exactly what the poll endpoint returns to that URL, signed and retried on failure. You can also set an account-wide address under Settings → Webhook in the console. Webhook docs →

curl https://kovapi.com/v1/videos/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "seedance-2.5", "prompt": "A paper boat drifts down a neon-lit street on a rainy night, low camera following it, crisp splashes and reflections", "duration": 5, "resolution": "720P", "size": "16:9", "callback_url": "https://your-domain.com/webhook"}'