promptstringrequired
Natural language prompt describing the video to generate. The agent handles avatar selection, script, and production automatically.
HeyGen Video Agent V3
heygen/video-agent/v3Heygen Video Agent V3 is HeyGen's text-to-video AI model. Turn written scripts and prompts into professional-quality video clips with realistic motion, lighting, and scene composition.
Try the model
Playground
Input
Natural language prompt describing the video to generate. The agent handles avatar selection, script, and production automatically.
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "prompt": "Create a 30-second product demo video showcasing our new AI features with professional lighting and modern graphics." }
HeyGen Video Agent V3
HeyGen Video Agent: describe the video you want and the agent writes, voices, and edits a complete presenter video.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | What the video should cover, its audience, length, and tone. |
Billing
$0.034 per output second (rounded up). The quote before submission assumes 30 seconds.
| Output | Price |
|---|---|
| 30s | $1.02 |
| 60s | $2.04 |
| 120s | $4.08 |
Failed runs are not charged.
Prompting
- State the target length in the prompt.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "heygen/video-agent/v3",
"prompt": "Create a 30-second product demo video showcasing our new AI features with professional lighting and modern graphics."
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
{
"model": "heygen/video-agent/v3",
"prompt": "Create a 30-second product demo video showcasing our new AI features with professional lighting and modern graphics."
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"poster": "https://static.sandbase.ai/examples/posters/066ba14b14f373727bbc.jpg",
"source": "heygen schema mirror",
"source_url": "https://heygen.example/",
"url": "https://static.sandbase.ai/examples/64dc4772-06ea-45c4-9b73-bcea51bccfbc/output/75f40a8e-d209-40de-82fa-d9e0977099ad.mp4"
}
]