GET

/v1/schemas/fal/video/fal-ai%2Fheygen%2Fv3%2Flipsync%2Fspeed?kind=output

Accept:

kind outputactivity videohash 41eb2f59…extracted Jul 6, 2026version currentsource upstream spec ↗

Response body

2 properties · 1 required · 1 $defs

property	type	description	constraints
video*	File	The lip-synced video file with new audio synced.
caption_file	File	Generated caption file when enable_caption is enabled and HeyGen returns one.	nullable

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"fal-ai/heygen/v3/lipsync/speed","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}