Seedance 2.5 & 2.0 API

# Minimal example: persist the Idempotency-Key and task ID in production.
# Requires curl, jq and BETTERTOKEN_API_KEY in your environment.
BASE=https://bettertoken.ai/v1
IDEM="$(uuidgen)"
cat > request.json <<'JSON'
{
  "model": "seedance-2.5-cn",
  "operation": "text_to_video",
  "prompt": "A rainy city street at night, slow forward camera move",
  "duration": {
    "mode": "fixed",
    "seconds": 5
  },
  "output": {
    "resolution": "480p",
    "aspect_ratio": "16:9",
    "format": "mp4"
  },
  "audio": {
    "mode": "off"
  }
}
JSON

curl --fail-with-body "$BASE/videos/quote" \
  -H "Authorization: Bearer $BETTERTOKEN_API_KEY" \
  -H 'Content-Type: application/json' --data-binary @request.json || exit 1

TASK=$(curl --fail-with-body "$BASE/videos" \
  -H "Authorization: Bearer $BETTERTOKEN_API_KEY" \
  -H "Idempotency-Key: $IDEM" \
  -H 'Content-Type: application/json' --data-binary @request.json) || exit 1
ID=$(printf '%s' "$TASK" | jq -er '.id') || exit 1
# Poll up to 360 times, waiting 5 seconds between requests.
# Network delays can extend the total time.
for attempt in $(seq 1 360); do
  TASK=$(curl --fail-with-body "$BASE/videos/$ID" \
    -H "Authorization: Bearer $BETTERTOKEN_API_KEY") || exit 1
  STATUS=$(printf '%s' "$TASK" | jq -r '.status')
  case "$STATUS" in
    completed) break ;;
    failed|canceled) printf '%s\n' "$TASK"; exit 1 ;;
  esac
  sleep 5
done
[ "$STATUS" = completed ] || { echo "Resume polling task: $ID"; exit 1; }
curl --fail-with-body "$BASE/videos/$ID/content" \
  -H "Authorization: Bearer $BETTERTOKEN_API_KEY" -o video.mp4