Multiple Face Swap Video API documentation

Replace up to four distinct tracked faces in one target video in a single operation. Detection runs inside the task and returns NEEDS_INPUT when selections are required. Billing is based on video duration and is not multiplied by mapped-face count.

Endpoints

Contract item	Value
Capability	`multiple-face-swap-video`
Submit	`POST https://vidmage.ai/api/v1/multiple-face-swap-video/submit`
Query	`POST https://vidmage.ai/api/v1/multiple-face-swap-video/query`
Task identifier	`taskId`
Result field	`videoUrl`

Authenticate with Authorization: Bearer YOUR_API_KEY. Save the task identifier and query the same capability. Use a stable Idempotency-Key for submission retries.

Product guide: AI Multi Face Swap API for Photos and Videos

Parameters and input rules

Field	Type	Required	Default	Meaning and limits
`targetVideoUrl`	`string`	Yes	Not specified	Target-video fileUrl returned by upload_files.
`faceMappings`	`object[]`	Yes	Not specified	One to four reference mappings. Omit indexes until get_task_result returns indexed previews, or provide explicit stable indexes. Minimum items: `1` Maximum items: `4`

faceMappings item fields

Field	Type	Required	Default	Meaning and limits
`targetFaceIndex`	`integer`	No	Not specified	Optional explicit zero-based tracked target face index. Minimum: `0` Maximum: `99`
`referenceFaceImageUrl`	`string`	Yes	Not specified	Publicly reachable reference-face image URL.
`referenceFaceIndex`	`integer`	No	Not specified	Optional explicit face index in the reference image. Minimum: `0` Maximum: `99`

Measured media limits

Input	Rule
`targetVideoUrl`	The server measures this media for billing. Maximum 300 seconds. Do not send `videoDuration` in the submission body.

Example request

{
  "targetVideoUrl": "https://vidmage.ai/assets/models/hailuo-ai-video-generator/skincare-ad.mp4",
  "faceMappings": [
    {
      "referenceFaceImageUrl": "https://vidmage.ai/assets/images/samples/smiling-man-sweater.webp"
    }
  ]
}

# Set VIDMAGE_IDEMPOTENCY_KEY to a unique value for this task; preserve it for transport retries.
curl -X POST "https://vidmage.ai/api/v1/multiple-face-swap-video/submit" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Idempotency-Key: ${VIDMAGE_IDEMPOTENCY_KEY}" \
  -H "Content-Type: application/json" \
  -d '{"targetVideoUrl":"https://vidmage.ai/assets/models/hailuo-ai-video-generator/skincare-ad.mp4","faceMappings":[{"referenceFaceImageUrl":"https://vidmage.ai/assets/images/samples/smiling-man-sweater.webp"}]}'
# -> { "success": true, "taskId": "...", "creditsRequired": ..., "creditsConsumed": 0, "usageDeferred": true }

Task results and recovery

URL of the completed video with all requested face mappings applied. Read videoUrl from the completed query response. Preserve taskId while the task is running.

curl -X POST "https://vidmage.ai/api/v1/multiple-face-swap-video/query" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "taskId": "TASK_ID_FROM_SUBMIT" }'
# -> { "success": true, "data": { "status": "...", "videoUrl": "https://..." } }

Submission authorizes this task; provider work and billing can advance during queries. Initial creditsConsumed: 0 does not mean the task is free. A timeout is not a confirmed failure. Recover the existing task instead of resubmitting.

For face selection and error recovery, follow Task lifecycle. MCP uses the normalized taskId argument in get_task_result, including capabilities whose REST identifier is requestId.

Credits

Component / option	Rate	Minimum
Video duration	1 credits / second	—

The example uses the duration shown above. The server measures uploaded media for billing; this duration is only supplied to the estimate.

Duration × rate is rounded up to whole credits; the applicable minimum charge is enforced.

Use the Playground or the MCP credit estimator for your exact inputs. Credits and billing.

Integration guides

Authentication · File uploads · Task lifecycle · Error recovery · MCP