HeyGen Translate (speed)

Endpoint

POST https://api.roasos.com/v1/dub/heygen-speed

Send your API key as a bearer token. The key needs the scope api:write. Every paid request also needs an Idempotency-Key header.

The envelope fields quote_only, quote_id, webhook_url and wait_timeout_seconds behave the same on each model endpoint. Refer to Jobs and Quotes and credits.

Good at

Take a talking-head ad into a second market and keep it looking shot in that language. Use this tier for volume: many languages, quick turnaround, and lip-sync that is good rather than perfect. Use heygen-precision when one hero asset must hold up on a large screen.

The price is $0.05 for each second of the OUTPUT video, not the input. roasOS quotes the input plus 25% and settles on the real output length, so the charge is at or below the number you saw and never above it.

Pricing

The unit is one source_second. Pricing key: heygen-speed.

The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with quote_only: true first.

Modes

• video-dub

Provider endpoints: fal-ai/heygen/v2/translate/speed.

Request fields

The schema is strict. A field that is not in this table gets 400 unsupported_option. The field names are the roasOS role names. One role has one name in every family.

Media

This endpoint accepts these media roles:

• video_url — the source video

Every other role is refused: avatar_id, elements, product_id, product_images, references, reference_images, image_url, end_image_url, scene_id, scene_image, video_urls, audio_urls, audio_url, voice_id. A refused role gets 400 unsupported_option.

Prompt

None. This model takes no prompt.

Send language as one of the 178 written names the model publishes, such as Spanish (Mexico) or Japanese (Japan). An ISO code is refused. Set translate_audio_only to true to leave every face untouched and change the voice track only.

enable_dynamic_duration lets the output run longer than the input so a slower language still sounds natural. roasOS holds it off by default, because this endpoint bills the output. Turn it on when fluency matters more than the exact length, and expect the price to rise with the clip.

Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

• brand_glossary_id — not accepted by this public endpoint.
• srt_url — not accepted by this public endpoint.
• srt_role — not accepted by this public endpoint.
• enable_caption — pinned to false.

Result

The result kind is video. Always present: url.

{
  "data": {
    "id": "gen_…",
    "kind": "video",
    "model": "heygen-speed",
    "status": "completed",
    "result": {
      "url": "https://cdn.roasos.com/workspaces/ws_01/result"
    }
  }
}

The files are immutable objects on https://cdn.roasos.com. A result URL is a valid media input for your next request.

Example

The three steps are always the same: quote, run, poll.

# 1. Quote. Nothing is spent.
curl -X POST https://api.roasos.com/v1/dub/heygen-speed \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-heygen-speed-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"language":"English","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 23, "expires_at": "...",
#        "confirmation": { "model": "heygen-speed", "example": "30s_source" } } }

# 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
curl -X POST https://api.roasos.com/v1/dub/heygen-speed \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-heygen-speed-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk...","language":"English","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 23 } }

# 3. Poll, then read the result.
curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..."
curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..."

Today

POST /v1/dub/heygen-speed is the only path to this model. There is no deprecated alias: POST /v1/generations has no dub type, so the old path cannot reach this family at all.

The source must be an MP4 your workspace owns, and at most 480 seconds — the maximum HeyGen states.

See also

• llms.txt for this model — the same facts as one plain-text file for an agent.
• GET https://api.roasos.com/v1/catalog/heygen-speed — the machine-readable form: enums, defaults, limits and prices. Refer to the API reference.
• Jobs — how to poll a job and read its result.
• Provider endpoints: fal-ai/heygen/v2/translate/speed.