Runway Aleph 2, Runway Gen 4.5 API: Pricing, Documentation

by Runway

Runway Aleph 2, developers can access Runway's industry-leading video generation for creating cinematic content from text and images. The API powers professional video production workflows, offering the quality and features demanded by filmmakers, advertisers, and media companies.

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Runway Aleph 2 API Documentation

https://gateway.pixazo.ai/aleph-2/v1/video-to-video

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Video to Video (Video Editing) - Aleph 2 API

Request Code

POST https://gateway.pixazo.ai/aleph-2/v1/video-to-video
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "prompt": "Edit the video to match the provided reference frame",
  "video_uri": "https://example.com/source-video.mp4",
  "prompt_images": [
    { "uri": "https://example.com/reference.jpg", "position": "first" }
  ]
}

import requests

url = "https://gateway.pixazo.ai/aleph-2/v1/video-to-video"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "prompt": "Edit the video to match the provided reference frame",
    "video_uri": "https://example.com/source-video.mp4",
    "prompt_images": [
        { "uri": "https://example.com/reference.jpg", "position": "first" }
    ]
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/aleph-2/v1/video-to-video';
const headers = {
  'Content-Type': 'application/json',
  'Cache-Control': 'no-cache',
  'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
};
const data = {
  prompt: 'Edit the video to match the provided reference frame',
  video_uri: 'https://example.com/source-video.mp4',
  prompt_images: [
    { uri: 'https://example.com/reference.jpg', position: 'first' }
  ]
};

fetch(url, {
  method: 'POST',
  headers: headers,
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -v -X POST "https://gateway.pixazo.ai/aleph-2/v1/video-to-video" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "Edit the video to match the provided reference frame",
    "video_uri": "https://example.com/source-video.mp4",
    "prompt_images": [
      { "uri": "https://example.com/reference.jpg", "position": "first" }
    ]
  }'

Output

{
  "request_id": "aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Examples

Common ways to call POST /aleph-2/v1/video-to-video. Each submit returns a request_id (HTTP 202, queued) — poll the status endpoint (see “Retrieving Results”) for the finished video. Output length matches your source video; billing is per second of the produced video.

Simple Video Edit — Apply a text-only edit to an existing video.

const res = await fetch("https://gateway.pixazo.ai/aleph-2/v1/video-to-video", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY",
  },
  body: JSON.stringify({
    prompt: "Transform the scene into a golden-hour sunset with warm lighting",
    video_uri: "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/cinematic-scene.mp4",
  }),
});

const { request_id } = await res.json() as { request_id: string };
// Poll GET /v2/requests/status/{request_id} until status === "COMPLETED"

curl -X POST "https://gateway.pixazo.ai/aleph-2/v1/video-to-video" \
  -H "Content-Type: application/json" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "Transform the scene into a golden-hour sunset with warm lighting",
    "video_uri": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/cinematic-scene.mp4"
  }'

Keyframe-Guided Edit — Edit a video using a reference image anchored to the first frame of the output.

const res = await fetch("https://gateway.pixazo.ai/aleph-2/v1/video-to-video", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY",
  },
  body: JSON.stringify({
    prompt: "Edit the video to match the provided reference frame",
    video_uri: "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/nature-close-up.mp4",
    prompt_images: [
      { uri: "https://upload.wikimedia.org/wikipedia/commons/8/85/Tour_Eiffel_Wikimedia_Commons_(cropped).jpg", position: "first" }
    ],
  }),
});

const { request_id } = await res.json() as { request_id: string };
// Poll GET /v2/requests/status/{request_id} until status === "COMPLETED"

curl -X POST "https://gateway.pixazo.ai/aleph-2/v1/video-to-video" \
  -H "Content-Type: application/json" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "Edit the video to match the provided reference frame",
    "video_uri": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/nature-close-up.mp4",
    "prompt_images": [
      { "uri": "https://upload.wikimedia.org/wikipedia/commons/8/85/Tour_Eiffel_Wikimedia_Commons_(cropped).jpg", "position": "first" }
    ]
  }'

Timed Keyframe Edit — Place a guidance image at a specific timestamp within the input video using keyframes[].seconds.

const res = await fetch("https://gateway.pixazo.ai/aleph-2/v1/video-to-video", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY",
  },
  body: JSON.stringify({
    prompt: "Change the background to a futuristic cityscape at night",
    video_uri: "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/simple-text-to-video.mp4",
    keyframes: [
      { uri: "https://upload.wikimedia.org/wikipedia/commons/8/85/Tour_Eiffel_Wikimedia_Commons_(cropped).jpg", seconds: 2.0 }
    ],
  }),
});

const { request_id } = await res.json() as { request_id: string };
// Poll GET /v2/requests/status/{request_id} until status === "COMPLETED"

curl -X POST "https://gateway.pixazo.ai/aleph-2/v1/video-to-video" \
  -H "Content-Type: application/json" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "Change the background to a futuristic cityscape at night",
    "video_uri": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/simple-text-to-video.mp4",
    "keyframes": [
      { "uri": "https://upload.wikimedia.org/wikipedia/commons/8/85/Tour_Eiffel_Wikimedia_Commons_(cropped).jpg", "seconds": 2.0 }
    ]
  }'

Content Moderation Override — Edit a video featuring public figures with relaxed content moderation.

const res = await fetch("https://gateway.pixazo.ai/aleph-2/v1/video-to-video", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY",
  },
  body: JSON.stringify({
    prompt: "Make the background a dramatic stormy sky",
    video_uri: "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/cinematic-scene.mp4",
    content_moderation: { public_figure_threshold: "low" },
  }),
});

const { request_id } = await res.json() as { request_id: string };
// Poll GET /v2/requests/status/{request_id} until status === "COMPLETED"

curl -X POST "https://gateway.pixazo.ai/aleph-2/v1/video-to-video" \
  -H "Content-Type: application/json" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "Make the background a dramatic stormy sky",
    "video_uri": "https://pub-04a6d208d361438ea01b797e6973bd19.r2.dev/catalog/runwayml__gen-4.5/cinematic-scene.mp4",
    "content_moderation": { "public_figure_threshold": "low" }
  }'

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Using curl? These are HTTP request headers — pass each with -H, e.g. -H "X-Webhook-URL: https://your-server.com/webhook/callback". Do not paste them as bare lines, and end every line of a multi-line command with \.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "aleph-2",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "aleph-2",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Video to Video

Parameter	Required	Type	Default	Allowed values / range	Description
prompt	Yes	string	—	1–1000 characters	Plain-language instruction describing the edit to apply to the source video. Describe only what should change (for example, "make it night time, keep the camera move").
video_uri	Yes	string	—	HTTPS URL, runway:// URI, or data:video/… URI; source video 2–30 s, 30 FPS or lower	Source video to edit. The output preserves the source video's length and resolution (up to 1080p) — there is no separate duration or resolution control, and billing is per second of the produced video.
prompt_images	No	array	—	1–5 items, each { uri, position } where position = "first" \| "last" \| {type:"timestamp",timestampSeconds} \| {type:"position",positionPercentage}	Optional reference images that guide the edit, each pinned to a position in the video: the first or last frame, an absolute timestamp (seconds), or a fraction of the way through (0–1).
keyframes	No	array	—	1–5 items, each { uri, seconds } with seconds 0–30, or { uri, at } with at 0–1 (exactly one of seconds or at per item)	Optional timed guidance images placed at specific points in the source video (up to 5). Use seconds for an absolute timestamp or at for a fraction of the video duration.
content_moderation	No	object	{ "public_figure_threshold": "auto" }	{ "public_figure_threshold": "auto" \| "low" }	Content-moderation settings. Requests default to auto; set public_figure_threshold to low to be less strict about generations that include recognizable public figures.
seed	No	integer	random	0–4294967295	Random seed that controls the generation's randomness. Reuse the same seed with identical settings to reproduce the same result; leave it empty for a different output each time.

Example Request

{
  "prompt": "Edit the video to match the provided reference frame",
  "video_uri": "https://example.com/source-video.mp4",
  "prompt_images": [
    { "uri": "https://example.com/reference.jpg", "position": "first" }
  ]
}

Response

{
  "request_id": "aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'aleph-2' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "aleph-2",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "aleph-2_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "aleph-2",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/aleph-2_019dxxxx-xxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-04-07T10:00:00.000Z",
  "updated_at": "2026-04-07T10:02:30.000Z",
  "completed_at": "2026-04-07T10:02:30.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Runway Aleph 2 API Pricing

Your request will cost $0.336 per second of output video.

5-second clip ≈ $1.68

2. Runway Gen-4.5

Runway Gen-4.5 API Documentation

https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/image-to-video

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Video Generation Request - Runway gen-4.5

Request Code

POST https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/image-to-video
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_API_KEY

{
  "prompt": "A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows"
}

import requests

url = "https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/image-to-video"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_API_KEY"
}
data = {
    "prompt": "A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows"
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/image-to-video';

const data = {
  prompt: 'A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows'
};

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Cache-Control': 'no-cache',
    'Ocp-Apim-Subscription-Key': 'YOUR_API_KEY'
  },
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -X POST "https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/image-to-video" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  --data-raw '{
    "prompt": "A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows"
  }'

Output

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "runway-gen-4-5",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "runway-gen-4-5",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Video Generation Request

Parameter	Required	Type	Default	Allowed values / range	Description
prompt	Yes	string	—	—	Text prompt describing the video to generate
image	No	string (URI)	—	—	Optional first-frame image URL for image-to-video mode (used as the video's first frame). If omitted, the video is generated from the text prompt only
duration	No	integer	5	5, 10	Length of the generated video in seconds
aspect_ratio	No	string	16:9	"16:9", "9:16", "4:3", "3:4", "1:1", "21:9"	Aspect ratio of the output video
seed	No	integer	—	—	Random seed that controls the generation's randomness. Reuse the same seed with identical settings to reproduce the same result; leave it empty for a different output each time.

Content Item Types & Limits

Type	Max	Format / Size	Description
image	1	JPG, PNG, WEBP · < 200 MB	Input image to animate.

Example Request

{
  "prompt": "An astronaut gazes through the cupola window of a space station at the glowing curve of Earth below, soft ambient light from control panels illuminates the cabin, the camera slowly drifts forward revealing the full panoramic viewport weightless tools float gently in the background, calm and awe-inspiring cinematic atmosphere",
  "image": "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/iss043e284928~medium.jpg",
  "duration": 10,
  "aspect_ratio": "21:9",
  "seed": 42
}

Response

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	Your API subscription key

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'runway-gen-4-5' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "runway-gen-4-5",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "runway-gen-4-5",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/runway-gen-4-5_019dxxxx-xxxx/output.ext"
    ],
    "media_type": "application/octet-stream"
  },
  "created_at": "2026-03-31T10:00:00.000Z",
  "updated_at": "2026-03-31T10:00:15.000Z",
  "completed_at": "2026-03-31T10:00:15.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Runway Gen-4.5 API Pricing

Your request will cost $0.12 per second of output video.

10-second clip ≈ $1.20

Text to Video

Runway Gen-4.5 API Documentation

https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/text-to-video

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Text to Video Request - Runway gen-4.5

Request Code

POST https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/text-to-video
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_API_KEY

{
  "prompt": "A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows"
}

import requests

url = "https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/text-to-video"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_API_KEY"
}
data = {
    "prompt": "A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows"
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/text-to-video';

const data = {
  prompt: 'A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows'
};

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Cache-Control': 'no-cache',
    'Ocp-Apim-Subscription-Key': 'YOUR_API_KEY'
  },
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -X POST "https://gateway.pixazo.ai/runway-gen-4-5/v1/gen-4.5/text-to-video" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  --data-raw '{
    "prompt": "A golden retriever puppy chasing butterflies through a sunlit lavender field, slow motion, cinematic depth of field, warm afternoon light casting long shadows"
  }'

Output

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "runway-gen-4-5",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "runway-gen-4-5",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Text to Video Request

Parameter	Required	Type	Default	Allowed values / range	Description
prompt	Yes	string	—	—	Text prompt describing the video to generate
duration	No	integer	5	5, 10	Length of the generated video in seconds
aspect_ratio	No	string	16:9	"16:9", "9:16", "4:3", "3:4", "1:1", "21:9"	Aspect ratio of the output video
seed	No	integer	—	—	Random seed that controls the generation's randomness. Reuse the same seed with identical settings to reproduce the same result; leave it empty for a different output each time.

Example Request

{
  "prompt": "An astronaut gazes through the cupola window of a space station at the glowing curve of Earth below, soft ambient light from control panels illuminates the cabin, the camera slowly drifts forward revealing the full panoramic viewport weightless tools float gently in the background, calm and awe-inspiring cinematic atmosphere",
  "duration": 10,
  "aspect_ratio": "21:9",
  "seed": 42
}

Response

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	Your API subscription key

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'runway-gen-4-5' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "runway-gen-4-5",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "runway-gen-4-5_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "runway-gen-4-5",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/runway-gen-4-5_019dxxxx-xxxx/output.ext"
    ],
    "media_type": "application/octet-stream"
  },
  "created_at": "2026-03-31T10:00:00.000Z",
  "updated_at": "2026-03-31T10:00:15.000Z",
  "completed_at": "2026-03-31T10:00:15.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Runway Gen-4.5 API Pricing

Your request will cost $0.12 per second of output video.

10-second clip ≈ $1.20