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API Reference for fal/h3-max, served by Comfy Router from fal.

Quick start

Create a key at platform.comfy.org/profile/api-keys and export it as COMFY_API_KEY. The Python and TypeScript snippets use the Comfy SDKs (pip install comfy-sdk, npm install @comfyorg/sdk); the cURL snippet is the same call over raw HTTP. Model ID: fal/h3-max Endpoint: POST https://api.comfy.org/v2/models/fal/h3-max

Schema

Input

string
default:"\"16:9\""
Aspect ratio: 21:9, 16:9, 4:3, 1:1, 3:4, or 9:16.
integer
default:"5"
Duration of the generated video in seconds.
boolean
default:"true"
Enable the safety checker.
string
required
Text prompt for video generation.
string
required
How much effort to spend rewriting the prompt before generation: balanced or quality.
string
default:"\"768P\""
Resolution of the generated video: 480P or 768P.
integer
Random seed. A random seed is selected when omitted.
boolean
Return the generated video as base64 instead of a CDN URL.
Generated from the schema Router serves at GET /v2/models/fal/h3-max/openapi.json, the same document it validates a call against before the request reaches the provider.

Output

Router does not publish an output schema for this model.

Examples

Input

Before you ship

The snippets above are the shortest working call. Three things are the same for every model and are documented once on the Comfy Router headers page: send an Idempotency-Key on every paid call and reuse it when you retry, expect the connection to be held up to Router’s 10 minute deadline, and keep X-Comfy-Request-Id from every response. The SDKs do all three for you; the cURL tab does none of them. On failure, X-Comfy-Error-Type names the bucket, and a 422 means the body failed the model’s schema and was never billed.

Headers

Authentication, idempotency, request IDs, error buckets, retry pacing, spend limits.

Quick Start

Typed error handling in Python and TypeScript, reading the 422, walking the catalog.

Limitations

What Router does not do today, and what to use instead.