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heygen-avatar4-image-to-video

model id: heygen-avatar4-image-to-video/{host_id}

Text in → Video out

Hosts

Host	Price
Fal	$0.1 / second

0% additional markup beyond our 2% platform fee.

“% off” discounts shown above are compared to Fal.ai’s price.

No live Playground for this model yet

Lip-sync models take an image plus an audio file — not a text prompt — via the dedicated POST /v1/lipsync endpoint. Switch to the API tab above for a ready-to-run Python/JavaScript/cURL example, or see the Lip sync guide.

# create
import requests

resp = requests.post(
    "https://videorouter.sh/api/v1/lipsync",
    headers={"Authorization": "Bearer llmr_sk_...", "Content-Type": "application/json"},
    json={"model": "heygen-avatar4-image-to-video", "image_url": "https://example.com/face.jpg", "audio_url": "https://example.com/speech.mp3"},
)
job = resp.json()

# poll
status = requests.get(
    f"https://videorouter.sh/api/v1/lipsync/{job['id']}",
    headers={"Authorization": "Bearer llmr_sk_..."},
).json()
print(status["status"])  # pending -> in_progress -> completed

// create
const res = await fetch("https://videorouter.sh/api/v1/lipsync", {
  method: "POST",
  headers: {
    Authorization: "Bearer llmr_sk_...",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "heygen-avatar4-image-to-video",
    image_url: "https://example.com/face.jpg",
    audio_url: "https://example.com/speech.mp3",
  }),
});
const job = await res.json();

// poll
const statusRes = await fetch(`https://videorouter.sh/api/v1/lipsync/${job.id}`, {
  headers: { Authorization: "Bearer llmr_sk_..." },
});
const status = await statusRes.json();
console.log(status.status);  // pending -> in_progress -> completed

# create
curl https://videorouter.sh/api/v1/lipsync \
  -H "Authorization: Bearer llmr_sk_..." \
  -H "Content-Type: application/json" \
  -d '{"model": "heygen-avatar4-image-to-video", "image_url": "https://example.com/face.jpg", "audio_url": "https://example.com/speech.mp3"}'

# poll (repeat until status is "completed" or "failed")
curl https://videorouter.sh/api/v1/lipsync/fal:... \
  -H "Authorization: Bearer llmr_sk_..."