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Developers/Runway API

Runway API

Add image-to-video generation to your app with Runway. Send a source image URL and motion prompt, then request a five- or ten-second clip through a compact API payload.

Get API keyView API docs
Abstract illustration for Runway API
PlaygroundAPIPricingGuideFAQs

Runway API Playground

Use your existing API key and subscription. Submitting a generation uses credits; uploading and preparing a request does not start a generation.

API access is available to subscribers only. Your subscription credits are shared across the website and the API.

View plans

Parameter

3 parameters

Text prompt describing the video to generate (max 1000 chars).

Input image URL (required, http/https).

Video duration in seconds.(Optional)

Default: 5

Request code

#!/usr/bin/env bash
set -euo pipefail
# Set this once per intended task; preserve it and the body for transport retries.
: "${VIDMAGE_IDEMPOTENCY_KEY:?Set a unique key for this task}"

SUBMIT_RESPONSE="$(curl --fail-with-body --silent --show-error -X POST "https://vidmage.ai/api/v1/runway-ai-video-generator/submit" \
  -H "Authorization: Bearer ${VIDMAGE_API_KEY}" \
  -H "Idempotency-Key: ${VIDMAGE_IDEMPOTENCY_KEY}" \
  -H "Content-Type: application/json" \
  --data-raw '{
  "prompt": "The camera slowly pushes in as the subject looks up and sunlight begins moving across the scene",
  "imageUrl": "https://vidmage.ai/assets/images/samples/blue-eyed-woman-sunlight.webp",
  "duration": "5"
}')"
TASK_ID="$(printf '%s' "$SUBMIT_RESPONSE" | jq -er '.["taskId"]')"

while true; do
  QUERY_RESPONSE="$(curl --fail-with-body --silent --show-error -X POST "https://vidmage.ai/api/v1/runway-ai-video-generator/query" \
    -H "Authorization: Bearer ${VIDMAGE_API_KEY}" \
    -H "Content-Type: application/json" \
    --data-raw "{\"taskId\":\"${TASK_ID}\"}")"
  STATUS="$(printf '%s' "$QUERY_RESPONSE" | jq -r '(.status // .data.status // "") | ascii_downcase')"
  case "$STATUS" in
    success|succeeded|completed)
      RESULT="$(printf '%s' "$QUERY_RESPONSE" | jq -r '(.result // .["videoUrl"] // .data["videoUrl"] // empty)')"
      if [ -z "$RESULT" ]; then
        printf '%s' "Result missing; preserve task $TASK_ID and query the same task again. Do not resubmit." >&2
        exit 2
      fi
      printf '%s\n' "$RESULT"
      break
      ;;
    needs_input)
      printf '%s' "Face selection required; preserve task $TASK_ID" >&2
      exit 2
      ;;
    failed|error)
      printf '%s' "$QUERY_RESPONSE" | jq -r '(.message // .error // .data.error // "Task failed")' >&2
      exit 1
      ;;
  esac
  sleep 5
done

Response data

Submit the task to see the API response here.
PlaygroundCapabilities

API documentation

Submit a request, track the task, and retrieve your result.

Required inputs
prompt imageUrl
Output
Video·videoUrl
Request setup & limitsHeaders, input options and media limits

Request headers

Authorization
Bearer YOUR_API_KEY

Keep your API key on your server.

Content-Type
application/json
Idempotency-Key
YOUR_UNIQUE_KEY

Use a new key per task. Reuse it only when retrying the same submission.

Input options & limits

Request controls follow each task's parameter rules; they do not guarantee output properties.

Runway AI Video Generator

Modes: image-to-video

Requiredprompt imageUrl
Request controls
  • duration: "5", "10"

Input retention and output-link lifetime depend on the API contract. Confirm API-specific retention terms before making promises to your users. Upload guide ↗

Runway AI Video Generator

POST /api/v1/runway-ai-video-generator/submit

Full API documentation ↗

prompt is required and imageUrl is required.

Required inputs

promptstring
Text prompt describing the video to generate (max 1000 chars).
imageUrlstring
Input image URL (required, http/https).

Edit the sample inputs for your own task before submitting.

Runway AI Video Generator request
# 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": ... }
Parameters and input rules3 fields
FieldTypeRequiredDefaultMeaning and limits
promptstringYesNot specifiedText prompt describing the video to generate (max 1000 chars). Minimum length: 1 · Maximum length: 1000
imageUrlstringYesNot specifiedInput image URL (required, http/https). No additional field constraint listed.
durationstringNo"5"Video duration in seconds. Values: "5", "10" · Default: "5"
Mode-specific fields & media limits
Image To Video rules
ControlMode-specific rule
promptRequired; minimum 1 characters; maximum 1000 characters
durationValues: "5", "10"; mode default: "5"
imageUrlImage input

Retrieve the result

Save taskId from the accepted submission and send it to this endpoint:

POST /api/v1/runway-ai-video-generator/query

Use the same Bearer API key. On completion, read the videoUrl result field.

Task states and recovery ↗
Runway AI Video Generator query
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://..." } }

Pricing

See what one image, video, or generation costs in credits. Your API and website activity share the same credit balance.

API credit rates and calculated example request costs
API / workflowExample requestPrice (credits)
Runway AI Video Generatorvideo API5-second video: 100 credits
How this is calculated
  • Base rate: 20 credits / second

Base charge = duration × the selected resolution rate.

Estimate your own request ↗
20 credits / secondSee calculation details
Billed in credits. Shared with the website.Active subscription required. Unit rates and examples follow current API credit rules.Billing details⌄

Examples show the charge for the inputs listed above. Resolution, duration, audio, output count and reference media can change the total. Minimum charges and rounding follow the selected API.

Use the Playground to estimate your request before submitting it. Estimates do not start a generation. Subscription and credit-pack prices are listed on the plans page.

Your task’s recorded usage is the source of truth for the final charge.

View plans ↗Billing guide ↗

About Runway API

VidMage's Runway API is an image-to-video interface that animates an existing visual using a written motion prompt. It accepts a source image URL, a prompt, and a requested duration of five or ten seconds. The request does not expose separate resolution, aspect ratio, or ending-frame controls. To explore this model's browser workflow, open VidMage's Runway AI Video Generator.

Runway API capabilities

Animate a source image
Provide imageUrl to establish the opening scene for the video you want to create from it.
Describe the intended movement
Use prompt to explain subject movement or camera action relative to what is already visible.
Choose the clip length
Request a five- or ten-second clip, depending on how much time the planned action needs.

What you can build

Storyboard animatics

Turn a storyboard frame into a five- or ten-second study of the action. A motion prompt specifies the character movement or camera push, giving directors footage they can place on an animatic timeline to work out the scene's pacing.

Product photos in motion

An approved hero image can do another job in the product gallery. Describe an orbit, reveal, or movement around the item to explore a video treatment, with the original still available for checking how the product appears.

Animated editorial illustrations

For an article about changing weather, clouds might drift across its illustration. For a profile, the subject might turn toward the viewer. These small motion briefs can extend existing artwork into a video header or social teaser.

How to use Runway API

  1. Get an API key

    Create a key in the Developer Console and store it on your server. Use it in the Authorization: Bearer header.

  2. Prepare and submit your inputs

    Set up your inputs in the Playground, then copy the matching API request. Send it from your server with a unique Idempotency-Key.

  3. Track the task

    Save the returned taskId and query the same operation until it completes. Keep that identifier if your app stops waiting.

  4. Retrieve the result

    Read videoUrl from the completed task. Preview the result in your app and save a copy to your own storage for later use.

Input tips
Start with an image
The listed workflow is image-to-video. Require a source image in your interface and describe the movement relative to it, rather than offering prompt-only generation.
Use the compact request
The public fields are prompt, imageUrl, and duration, with duration sent as "5" or "10". Resolution, aspectRatio, and ending-frame fields are not exposed by this capability.

Input requirementsUpload local files

Task fields and results

Keep the task identifier with its original request and Idempotency-Key. Query the same capability until it completes, then read the documented result field.

Task identifier
taskId
Query route
POST /api/v1/runway-ai-video-generator/query
Completed result
videoUrl
Task states and response structure ↗
Errors, retries and limits

Retry transport failures with the same idempotency key only when the original submission may not have reached the server. For a confirmed task, keep querying the original task instead of submitting a duplicate.

Read error recovery guidance ↗

FAQs

Are failed or timed-out requests charged?

A client timeout is not a confirmed task failure. Confirmed failures are automatically refunded only when the refund outcome is certain. Unknown charges or refunds remain pending reconciliation.

Failure and refund handling ↗
How long should my app wait for a result?

The checked contract does not establish a fixed completion time. Choose a local wait budget for your app; it is not an API completion deadline.

Polling and wait budgets ↗
What are the rate and concurrency limits?

Request-rate limits control how often you can call the API; concurrency limits control simultaneous work. The documentation ties both to the stable API key but does not publish numeric limits for this operation. Confirm account limits before planning parallel jobs.

Rate-limit recovery ↗
Can I receive results through a webhook?

The checked request contract documents status queries and does not list a webhook or callback field for these routes. Check the current authenticated OpenAPI contract before making a callback part of your integration.

Query task results ↗Check the current contract ↗

Explore more APIs on VidMage

  • Grok Video API↗
  • Sora 2 API↗
  • Seedance 2.5 API↗
  • MiniMax H3 API↗
  • Veo 3.1 API↗
  • Vidu API↗
  • Hailuo API↗
  • Midjourney Video API↗