# HeyGen image to video avatar4 Needs image url. Served by fal.ai. Heygen, served by fal.ai. The OpenAPI schema for the fal-ai/heygen/avatar4/image-to-video queue. Price: Your request will cost $0.1 per output video second. Actual-cost billing: the initial reservation is an estimate, not a maximum. 30 seconds at $0.1/s; actual input/output duration determines cost. The unique Billing Events receipt for this exact endpoint and request_id is the final USD charge, including usage above the estimate. Missing receipts retain the reservation for reconciliation; no guessed final fee. Asynchronous: returns a request_id; poll fal/status and fetch fal/result with model "fal-ai/heygen" and that request_id. Billed once, when the result is ready; a generation that fails is refunded. - Tool ID: `fal/heygen-avatar4-image-to-video` - Name in the catalog: Heygen - Provider: [fal.ai](/providers/fal.md) - Capability: [AI video generation](/tools/video-generation.md) - Price: usage based, the maximum is shown before a run - Authentication: an authorised Agentik workspace is required for execution, including zero-price tools. ## Pricing contract Billed at the exact provider cost, without a per-call cap. The initial reservation is an estimate; additional usage is debited and unused funds are refunded. ```json { "model": "reported", "costPath": "cost_usd", "requireCost": true, "costMode": "actual", "reservationBasis": "30 seconds at $0.1/s; actual input/output duration determines cost.", "maxUsdDefault": 3, "maxUsdCap": 3 } ``` Pricing source: [https://fal.ai/models/fal-ai/heygen/avatar4/image-to-video](https://fal.ai/models/fal-ai/heygen/avatar4/image-to-video). Your request will cost $0.1 per output video second. Actual-cost billing: the initial reservation is an estimate, not a maximum. 30 seconds at $0.1/s; actual input/output duration determines cost. The unique Billing Events receipt for this exact endpoint and request_id is the final USD charge, including usage above the estimate. Missing receipts retain the reservation for reconciliation; no guessed final fee.. Price verification date: 2026-10-07. ## Complete input schema ```json { "type": "object", "properties": { "expression": { "description": "Facial expression", "anyOf": [ { "type": "string", "const": "happy" }, { "type": "null" } ], "title": "Expression" }, "resolution": { "enum": [ "360p", "480p", "540p", "720p", "1080p" ], "default": "720p", "type": "string", "description": "Video resolution preset. Options: 360p, 480p, 540p, 720p, 1080p", "title": "Resolution" }, "voice": { "description": "Name of the voice to use for the avatar", "enum": [ "Warm Pro Narrator", "Chill Brian", "Ivy", "John Doe", "Monika Sogam", "Hope ", "Archer ", "Brittney", "Patrick", "David Castlemore", "Michael C", "Adam Stone ", "Juniper", "Cassidy ", "Jessica Anne Bogart", "Arabella", "Andrew", "Spuds Oxley ", "Grace Elder", "Helen", "Canyon Rivers", "Derya - Lifelike - Excited 🤩", "Mellow Marcus", "Jack Sterling - Broadcaster 🎙️", "Brenda - UGC - 1.mp4", "Reid", "Reagan", "Terry", "Jenny", "Radio Rick", "Denise", "Tim in car - Excited 🤩", "Iskander", "Thompson", "Delicate Daisy - Excited 🤩", "Kingston", "George UGC 1", "Bold Blake", "Jane", "Expressive Evan", "Marianne - IA", "Aaron", "Modern Recipe Host - Voice 1", "Willow", "Cute Chloe - Friendly 😊", "Rafael", "June - Lifelike", "Crisp Chloe", "Slick Simon", "Nassim - Informative", "Baritone Ben", "Maxwell", "Ellie Faye - Excited 🤩", "Milani", "Feisty Fiona - Excited 🤩", "Professor Dean", "Rose - UGC - 1.mp4", "Shona", "Hudson Wilder", "Ann - IA", "Alastair Kensington", "Oxley", "Christina", "Andrew Rizz ", "Peyton", "Gerardo - Outdoor", "Chloe - Lifelike", "Stephanie", "Anthony - IA", "Signal - Voice 1", "Luca", "Lisa - Voice 1", "T.W.Tucker", "Jack Sullivan - Serious 😐", "Winter", "Mireia - Lifelike", "Georgia", "Stella", "Masha - Lifelike", "Charming Charles - Friendly 😊", "Serenity", "Annie - Excited", "Ralph", "Bethany", "Dominic", "Mason Finn", "Leena", "Veteran Victor", "Tamara", "Nik Public", "Calm Chloe", "Sevik", "Reilly", "Raul", "Imposing Ian", "Relaxed Ray", "Dexter - Professional", "Relaxed Rick", "Edwin", "Rupert Blackwood", "Ginny", "Hope" ], "anyOf": [ { "type": "string" }, { "type": "null" } ], "title": "Voice" }, "audio_url": { "description": "URL of an audio file for the avatar to lip-sync to. When provided, overrides prompt and voice.", "anyOf": [ { "type": "string" }, { "type": "null" } ], "title": "Audio Url" }, "prompt": { "description": "The text the avatar will speak", "anyOf": [ { "type": "string" }, { "type": "null" } ], "title": "Prompt" }, "background": { "type": "object", "properties": { "type": { "enum": [ "color", "image", "video" ], "default": "color", "type": "string", "description": "Type of background", "title": "Type" }, "value": { "description": "Background value - hex color for 'color' type, URL for 'image' or 'video' type", "default": "#FFFFFF", "type": "string", "title": "Value" } }, "x-fal-order-properties": [ "type", "value" ], "title": "AvatarIVBackground" }, "talking_style": { "enum": [ "stable", "expressive" ], "default": "stable", "type": "string", "description": "Talking style - 'stable' for minimal movement, 'expressive' for more animation", "title": "Talking Style" }, "image_url": { "type": "string", "description": "URL of the image to animate. The image should contain a clear face.", "title": "Image Url" }, "caption": { "description": "Whether to add captions to the video", "default": false, "type": "boolean", "title": "Caption" }, "aspect_ratio": { "enum": [ "16:9", "9:16", "4:5", "5:4", "1:1", "auto" ], "default": "16:9", "type": "string", "description": "Aspect ratio of the output video. Supported values: '16:9', '9:16', '4:5', '5:4', '1:1', and 'auto'. 'auto' preserves the source aspect ratio when HeyGen can read it, falling back to '16:9' otherwise.", "title": "Aspect Ratio" } }, "required": [ "image_url" ], "additionalProperties": false } ``` ## Published example This is the provider tool’s published example. Replace example values with the user’s requested inputs, respecting the schema; do not execute an example merely to test a connection. ```json { "tool_id": "fal/heygen-avatar4-image-to-video", "input": { "image_url": "https://v3b.fal.media/files/b/0a90062c/A7EIviZqNxZ2HAs0yHeZ6_77a05b99-8588-4ffc-90aa-be7f9d34e9d3.png" } } ``` ## Execute and retrieve Inspect again before execution, explain the price and obtain the required authority. Use MCP run_tool or POST /v1/run with this tool ID, valid input and an idempotency key. Save the returned run ID and follow the actual state. If Agentik answers that the tool is temporarily unavailable, do not retry it blindly; use discovery to propose an alternative. This tool uses deferred settlement. Follow its returned task/run instructions; preserve the existing reservation until the result is reconciled. A partial or uncertain result can still have consumed provider resources. Consult [billing](/docs/billing.md), [idempotency](/docs/idempotency.md) and [asynchronous results](/docs/async.md). [Provider documentation](https://fal.ai/models/fal-ai/heygen/avatar4/image-to-video) [REST inspection](https://api.agentik.cc/v1/tools/fal/heygen-avatar4-image-to-video) · [OpenAPI](/openapi.json) · [Connection guide](/connect.md) --- [HTML page](/providers/fal/heygen-avatar4-image-to-video) · [Agent index](/llms.txt)