Runway AI Video Generator API documentation

Generate videos with Runway AI Video Generator (Runway).

Endpoints

Contract item	Value
Capability	`runway-ai-video-generator`
Submit	`POST https://vidmage.ai/api/v1/runway-ai-video-generator/submit`
Query	`POST https://vidmage.ai/api/v1/runway-ai-video-generator/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: Runway API

Parameters and input rules

Field	Type	Required	Default	Meaning and limits
`prompt`	`string`	Yes	Not specified	Text prompt describing the video to generate (max 1000 chars). Minimum characters: `1` Maximum characters: `1000`
`imageUrl`	`string`	Yes	Not specified	Input image URL (required, http/https).
`duration`	`string`	No	`"5"`	Video duration in seconds. Values: `"5"`, `"10"`

image to video

These are public VidMage field names. The server maps them to provider fields. Input media selects the mode; use its limits together with the parameter table.

Control	Mode-specific rule
`prompt`	Required; 1–1000 characters.
`duration`	JSON string. Values: `"5"`, `"10"`. Default: `5`.
`aspectRatio`	Not used in this mode.
`resolution`	Not used in this mode.
`imageUrl`	Use this public input field.

Example request

{
  "imageUrl": "https://vidmage.ai/assets/images/samples/blue-eyed-woman-sunlight.webp",
  "prompt": "The camera slowly pushes in as the subject looks up and sunlight begins moving across the scene",
  "duration": "5"
}

# Set VIDMAGE_IDEMPOTENCY_KEY to a unique value for this task; preserve it for transport retries.
curl -X POST "https://vidmage.ai/api/v1/runway-ai-video-generator/submit" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Idempotency-Key: ${VIDMAGE_IDEMPOTENCY_KEY}" \
  -H "Content-Type: application/json" \
  -d '{"imageUrl":"https://vidmage.ai/assets/images/samples/blue-eyed-woman-sunlight.webp","prompt":"The camera slowly pushes in as the subject looks up and sunlight begins moving across the scene","duration":"5"}'
# -> { "success": true, "taskId": "...", "creditsConsumed": ... }

Task results and recovery

URL of the generated video. Read videoUrl from the completed query response. Preserve taskId while the task is running.

curl -X POST "https://vidmage.ai/api/v1/runway-ai-video-generator/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 and task queries report the available task and usage information. 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
Base rate	20 credits / second	—

Base charge = duration × the selected resolution rate.

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