Runway Gen 4 API

Runway Gen 4 Turbo via WaveSpeed. Precise camera control and motion brush. Billed in Varosity Credits.

$0.011/s on Varosity credits ($0.010/s with your own key). Clips up to 10s.

Try Runway Gen 4 Get an API key

no wavespeed account needed · no subscription · failed renders never billed

Best for

camera control
cinematic motion brush
video-to-video

Trade-offs

requires reference image for best results

Call it from your code

One Varosity key works for every model. Video renders are async — the response has a jobId; poll GET /api/v1/jobs/{jobId} until status is "succeeded", then read outputUrl.

curl -X POST https://varosity.ai/api/v1/video/generate \
  -H "Authorization: Bearer $VAROSITY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "cinematic aerial of a coastal road at golden hour, slow push-in",
    "modelId": "ws-runway-gen4",
    "aspectRatio": "16:9",
    "durationSec": 5
  }'

Or ask your agent

Connect Claude, Cursor, or any MCP client to https://varosity.ai/api/mcp with your key, then say:

"Use Varosity with ws-runway-gen4 to make a 5-second clip of …"

Agent setup guide