Models/Runway/Video API

Live5 endpoints

Runway API — Gen Video, Act Two & Aleph

The Runway API gives you programmatic access to Runway's video generation and editing model family — text-to-video, image-to-video, Act Two performance transfer, and Aleph video-to-video restyling, all through one Muapi API key, from $0.07 per call.

Get Runway API Key Try Runway in Playground

🎬 GenerationCore text-to-video and image-to-video generation2 models

Text to VideoLive

🎬 Generation

Runway Text to Video

Turn a written prompt into a short video clip, ranging from photorealistic to highly stylized animation.

Standard

$0.09/request

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Image to VideoLive

🎬 Generation

Runway Image to Video

Animate a static image into a dynamic video clip with motion effects and scene continuity.

Standard

$0.15/request

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🎭 Act TwoTransfer facial expressions and head movements from a reference video onto a character2 models

Image to VideoLive

🎭 Act Two

Runway Act Two (Image to Video)

Transform a static character image into a video performance by transferring facial expressions and head movements from a reference video.

Standard

$0.07/request

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Video to VideoLive

🎭 Act Two

Runway Act Two (Video to Video)

Resync an existing character video with the motion from a reference video, updating facial expressions and head movement while preserving the original look.

Standard

$0.30/request

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🎨 AlephRestyle an existing video's look while preserving its motion and structure1 models

Video to VideoLive

🎨 Aleph

Runway Aleph

Transform an input video into a new visual style, scene, or atmosphere while preserving the original motion, structure, and timing.

Standard

$0.20/request

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What is the Runway API?

The Runway API gives applications programmatic access to Runway's video generation and editing models. Generate a video from a text prompt or image, transfer a performance from a reference video onto a character with Act Two, or restyle an existing video's look with Aleph while keeping its original motion and timing.

Muapi exposes the Runway endpoint family through one REST API. Use the video playground to compare Runway against other video models, then combine generation, performance transfer, and restyling in your own pipeline.

Key Capabilities

Text-to-Video

Turn a written prompt into a short video clip with Runway's generation model.

Image-to-Video

Animate a static image into a dynamic video with motion effects and scene continuity.

Act Two Performance Transfer

Transfer facial expressions and head movements from a reference video onto a character image or video.

Aleph Video Restyling

Change a video's visual style, scene, or atmosphere while preserving the underlying motion and structure.

One API Key

Use Muapi authentication, billing, and task responses across every Runway endpoint.

Async REST, No App Required

Every endpoint uses Muapi's standard asynchronous submit-and-poll pattern — no separate Runway account or app needed.

Runway API Endpoint Comparison

Endpoint	Input	Output	Price	Best For
runway-text-to-video	Prompt	Video	$0.09/request	New scenes from a text description
runway-image-to-video	Image + prompt	Video	$0.15/request	Animating a reference image
runway-act-two-i2v	Image + reference video	Video	$0.07/request	Performance transfer onto a still character
runway-act-two-v2v	Video + reference video	Video	$0.30/request	Resyncing an existing character video
runway-aleph-v2v	Video + prompt	Video	$0.20/request	Restyling an existing video's look

Prices and supported fields are model-specific. Review the live Playground schema before shipping generated video in production.

How to Call the Runway API

Submit a JSON request with your Muapi API key, save the request ID, and poll the shared result endpoint. Provide publicly reachable image or video URLs for image-to-video, Act Two, and Aleph requests.

1. Generate video from text

curl -X POST https://api.muapi.ai/api/v1/runway-text-to-video \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"A cinematic drone shot rising over a misty forest at dawn","aspect_ratio":"16:9","resolution":"720p","duration":5}'

# Response: {"request_id":"REQUEST_ID"}

Call runway-text-to-video with a prompt, aspect ratio, resolution, and duration.

2. Animate an image

curl -X POST https://api.muapi.ai/api/v1/runway-image-to-video \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"Camera slowly pushes in as steam rises from the cup","image_url":"https://example.com/reference.jpg","aspect_ratio":"16:9","resolution":"720p","duration":5}'

# Response: {"request_id":"REQUEST_ID"}

Call runway-image-to-video with a reference image URL and a motion prompt.

3. Poll the result

curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \
  -H "x-api-key: YOUR_API_KEY"

# Poll until status is completed, then read the generated video URL from outputs.

Poll until the task is completed, then read the returned video URL.

Frequently Asked Questions

Can I generate video from a text prompt with the Runway API?

Yes. runway-text-to-video accepts a prompt, aspect ratio, resolution, and duration, and returns a video clip.

Can I animate an existing image with Runway?

Yes. runway-image-to-video accepts a reference image URL plus a motion prompt and returns an animated video clip.

What is Runway Act Two?

Act Two transfers facial expressions and head movements from a reference video onto a character. runway-act-two-i2v starts from a still image; runway-act-two-v2v resyncs an existing character video.

What is Runway Aleph?

Aleph is Runway's video-to-video model. runway-aleph-v2v takes an existing video plus a text prompt describing the new style, scene, or mood, and applies that transformation while preserving the original motion and timing.

How much does the Runway API cost?

Text-to-video costs $0.09 per request; image-to-video costs $0.15; Act Two image-to-video costs $0.07; Act Two video-to-video costs $0.30; Aleph video-to-video costs $0.20.

Do I need a Runway account to use this API?

No. Muapi exposes Runway as standard asynchronous REST endpoints. Create a Muapi API key, submit JSON, and poll the returned request ID without a separate Runway account.

Compare AI Video APIs →See Runway alongside Sora, Veo 3, Kling, Seedance, and every other video model on Muapi.Explore the Veo 3 API →Compare Runway's motion fidelity against Google's Veo 3 on the same brief.Browse text-to-video models →Compare every text-to-video model in the Muapi catalog side by side.

Ready to build with Runway?

Create one Muapi API key and connect generation, Act Two performance transfer, and Aleph restyling in a single asynchronous workflow.

Get an API Key Try Runway in Playground