Runway Video Generation API documentation

Integrate Runway Video Generation with your VezAPI key. The operations below share the same authentication and account balance.

Base URL: https://api.vezapi.com
Send Authorization: Bearer YOUR_VEZAPI_KEY. Use a unique Idempotency-Key for each submission; reuse it only when checking the same request.

extend-ai-video

POST/api/v1/jobs/createTask

Model IDs: runway/extend-ai-video

Parameter	Type	Description & constraints
`model` required	`string`	Model name. Fixed: runway/extend-ai-video. Default: `"runway/extend-ai-video"`
`callBackUrl` optional	`string`	The URL to receive AI video extension task completion updates. Required for all video extension requests. - System will POST task status and results to this URL when video extension completes - Callback includes extended video URLs, cover images, and task information - Your callback endpoint should accept POST requests with JSON payload containing extension results - For detailed callback format and implementation guide, see [Video Extension Callbacks]([see VezAPI documentation]) - Alternatively, poll Get Task Details (/market/common/get-task-detail). - To ensure callback security, see [Webhook Verification Guide](/common-api/webhook-verification) for signature verification implementation
`input` required	`object`
`input.task_id` required	`string`	Unique identifier of the original video generation task. Must be a valid task ID from a previously generated video.
`input.prompt` required	`string`	Descriptive text that guides the continuation of the video. Explain what actions, movements, or developments should happen next. Be specific but maintain consistency with the original video content.
`input.quality` required	`string`	Video resolution, optional values are 720p or 1080p.
`input.watermark` optional	`string`	Video watermark text content. An empty string indicates no watermark, while a non-empty string will display the specified text as a watermark in the bottom right corner of the video.

Request example

curl -X POST 'https://api.vezapi.com/api/v1/jobs/createTask' \
  -H 'Authorization: Bearer YOUR_VEZAPI_KEY' \
  -H 'Idempotency-Key: your-unique-request-id' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "runway/extend-ai-video",
  "input": {
    "task_id": "ee603959-debb-48d1-98c4-a6d1c717eba6",
    "prompt": "The cat continues dancing with more energy and excitement, spinning around with colorful light effects intensifying",
    "quality": "720p"
  }
}'

Responses and errors

HTTP 200

Request successful

Parameter	Type	Description & constraints
`code` optional	`integer`	Status code of the request. The HTTP status is 200 even when the request fails, so always check this field: 200 means success; any other value means the request failed and msg describes the reason. Common values: 401 invalid or missing API key; 402 insufficient credits; 429 rate limit exceeded; 422 or 500 the request could not be processed (read msg and check your parameters before retrying). Values: `200, 401, 404, 422, 429, 451, 455, 500`
`msg` optional	`string`	Status message
`data` optional	`object`
`data.taskId` optional	`string`	Task ID for tracking task status. Use this ID with the "Get AI Video Details" endpoint to query extension task details and results.

HTTP 500

Server error.

Parameter	Type	Description & constraints
`code` required	`integer`	Response status code - 200: Success - Request has been processed successfully - 401: Unauthorized - Authentication credentials are missing or invalid - 402: Insufficient Credits - Account does not have enough credits to perform the operation - 404: Not Found - The requested resource or endpoint does not exist - 408: Timeout - No result has been returned for over 10 minutes. - 422: Validation Error - The request parameters failed validation checks - 429: Rate Limited - Request limit has been exceeded for this resource - 455: Service Unavailable - System is currently undergoing maintenance - 500: Server Error - An unexpected error occurred while processing the request - 501: Generation Failed - Content generation task failed - 505: Feature Disabled - The requested feature is currently disabled
`msg` required	`string`	Response message, error description when failed
`data` required	`object`

generate-ai-video

POST/api/v1/jobs/createTask

Model IDs: runway

Parameter	Type	Description & constraints
`model` required	`string`	Model version to use for generation. Default: `"runway"`
`callBackUrl` optional	`string`	The URL to receive AI video generation task completion updates. Required for all video generation requests. - System will POST task status and results to this URL when video generation completes - Callback includes generated video URLs, cover images, and task information - Your callback endpoint should accept POST requests with JSON payload containing video results - For detailed callback format and implementation guide, see [Video Generation Callbacks]([see VezAPI documentation]) - Alternatively, poll Get Task Details (/market/common/get-task-detail). - To ensure callback security, see [Webhook Verification Guide](/common-api/webhook-verification) for signature verification implementation
`input` required	`object`
`input.prompt` required	`string`	Descriptive text that guides the AI video generation. Be specific about subject, action, style, and setting. When used with an image, describes how to animate or modify the image content. Maximum length is 1800 characters.
`input.image_url` optional	`string`	Optional reference image URL to base the video on. When provided, the AI will create a video animating or extending this image.
`input.duration` required	`number`	Video duration, optional values are 5 or 10. If 10-second video is selected, 1080p resolution cannot be used
`input.quality` required	`string`	Video resolution, optional values are 720p or 1080p. If 1080p is selected, 10-second video cannot be generated
`input.aspect_ratio` optional	`string`	Video aspect ratio parameter. Required parameter for text-to-video generation requests. This parameter is invalid when image_url is passed, and the aspect ratio will ultimately be determined by the provided image. Values: `"16:9", "4:3", "1:1", "3:4", "9:16"`
`input.watermark` optional	`string`	Video watermark text content. An empty string indicates no watermark, while a non-empty string will display the specified text as a watermark in the bottom right corner of the video.

Request example

curl -X POST 'https://api.vezapi.com/api/v1/jobs/createTask' \
  -H 'Authorization: Bearer YOUR_VEZAPI_KEY' \
  -H 'Idempotency-Key: your-unique-request-id' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "runway",
  "input": {
    "prompt": "A fluffy orange cat dancing energetically in a colorful room with disco lights",
    "duration": "5",
    "quality": "720p",
    "aspect_ratio": "9:16"
  }
}'

Responses and errors

HTTP 200

Request successful

Parameter	Type	Description & constraints
`code` optional	`integer`	Status code of the request. The HTTP status is 200 even when the request fails, so always check this field: 200 means success; any other value means the request failed and msg describes the reason. Common values: 401 invalid or missing API key; 402 insufficient credits; 429 rate limit exceeded; 422 or 500 the request could not be processed (read msg and check your parameters before retrying). Values: `200, 401, 404, 422, 451, 455, 500`
`msg` optional	`string`	Error message when code != 200
`data` optional	`object`
`data.taskId` optional	`string`	Unique identifier for the generation task, can be used with `Get AI Video Details` to query task status

HTTP 500

Server error.

Parameter	Type	Description & constraints
`code` required	`integer`	Response status code - 200: Success - Request has been processed successfully - 401: Unauthorized - Authentication credentials are missing or invalid - 402: Insufficient Credits - Account does not have enough credits to perform the operation - 404: Not Found - The requested resource or endpoint does not exist - 408: Timeout - No result has been returned for over 10 minutes. - 422: Validation Error - The request parameters failed validation checks - 429: Rate Limited - Request limit has been exceeded for this resource - 455: Service Unavailable - System is currently undergoing maintenance - 500: Server Error - An unexpected error occurred while processing the request - 501: Generation Failed - Content generation task failed - 505: Feature Disabled - The requested feature is currently disabled
`msg` required	`string`	Response message, error description when failed
`data` required	`object`

Task status and callbacks

For asynchronous tasks, keep the returned taskId. Query GET /api/v1/jobs/recordInfo?taskId=... or provide callBackUrl when creating the task. Only the account that created a task can access it or derive new resources from it.

A timeout can mean the submission was accepted. Inspect the existing request in your dashboard; do not create another task automatically. Callback delivery is retried and may arrive more than once. Deduplicate with X-VezAPI-Event-Id.

Files, logs and billing

Generated media normally follows a 14-day provider lifetime; uploaded files expire after 24 hours. Save the files you need before expiration. VezAPI streams registered files without keeping a permanent media library. Request logs are retained for two calendar months.

Credits are reserved before submission. Final deductions match actual discounted consumption one for one. Unknown usage pauses new paid requests. If available funds cannot cover final usage while protecting other reservations, settlement stays pending until funded; model usage cannot make the wallet negative. Time-based inputs require server-side metadata reads; a failed read prevents submission.