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fal

fal Realtime API

WebSocket-based realtime inference for ultra-low latency interactive generative experiences such as LCM/SDXL sketch-to-image, live-portrait, and realtime upscaling. Bi-directional binary/JSON messaging keeps a persistent connection open so each frame, prompt, or pose adjustment is processed in milliseconds. Powers fal.realtime client utilities used in canvas apps, drawing tools, AR experiences, and live video pipelines.

Documentation Provider Profile APIs.io AsyncAPI GitHub

fal Realtime API is one of 12 APIs that fal publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include Artificial Intelligence, Generative AI, Real-Time, WebSocket, and Streaming. The published artifact set on APIs.io includes API documentation, code examples, and an AsyncAPI specification.

This event API exposes 3 operations across 2 channels, and defines 15 schemas. It is described by AsyncAPI 2.6.0, at version 1.0.0.

The API connects through 2 servers: queue.fal.run (https), fal.run (wss).

3 operations 2 channels 15 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 2.6.0
API Version
1.0.0
Base URL
wss://realtime.fal.run
Contact
fal Support
License
Proprietary
Resource Areas
1

Channels & Operations 3

Across 2 channels, the API surfaces 3 operations. Each is listed below with its action, channel, parameters, and response codes.

Channels 3
SUB
{model_id}/requests/{request_id}/status/stream
Subscribe to queue status events for a submitted request.
subscribeQueueStatusStream 2 params body
SUB
{app_id}/realtime
Receive inference outputs and connection control messages.
receiveRealtimeOutput 1 param body
PUB
{app_id}/realtime
Send an inference input frame.
sendRealtimeInput 1 param body

Messages & Schemas 15

The contract defines 15 schemas that model the data carried by its messages. The most detailed are RealtimeInput (7 properties), RealtimeResult (5 properties), QueueStatusCompleted (5 properties), QueueStatusInQueue (4 properties). Each schema is shown below with its type and property counts.

QueueStatusInQueue
message
Request has been received and persisted; waiting for an available runner.
QueueStatusInProgress
message
fal's dispatcher has routed the request to a runner.
QueueStatusCompleted
message
Result is stored and available for retrieval at responseurl (or was POSTed to the configured webhook). This is the terminal event of the stream.
RealtimeInput
message
Inference input frame. The accepted fields are defined by the OpenAPI schema of the target model — see the model's playground page on https://fal.ai/models for…
RealtimeResult
message
Inference output frame. Fields are model-specific; image-generation apps return an images array. The requestid echoes the inference invocation it corresponds t…
RealtimeError
message
Inference or framework-level error returned by the realtime runner.
RealtimeUnauthorized
message
Sent when the supplied credentials (proxy headers or JWT) cannot be verified. The connection is closed by the server after this frame.
QueueStatusInQueue
object
4 properties 2 required
QueueStatusInProgress
object
4 properties 2 required
QueueStatusCompleted
object
5 properties 2 required
QueueLogEntry
object
3 properties
RealtimeInput
object
Free-form, model-specific input frame. The exemplar properties below are the most common across realtime image-generation apps; consult the model OpenAPI schem…
7 properties
RealtimeResult
object
Model-specific output frame. Fields shown reflect the image-generation realtime apps (fast-lcm-diffusion, fast-turbo-diffusion, fast-sdxl). Other modalities re…
5 properties
RealtimeError
object
3 properties 1 required
RealtimeUnauthorized
object
2 properties 2 required

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

fal-ai-asyncapi.yml Raw ↑

Other APIs fal publishes across the network.

fal Streaming API
AE Profile APIs.io
fal Models Catalog API
AE Profile APIs.io
fal Compute API
AE Profile APIs.io
fal API Keys API
AE Profile APIs.io
fal Usage and Billing API
AE Profile APIs.io
fal Apps API
AE Profile APIs.io
fal Files API
AE Profile APIs.io
fal Queue API
AE Profile APIs.io
fal Secrets API
AE Profile APIs.io
fal Storage API
AE Profile APIs.io
fal Streaming API
AE Profile APIs.io
#Artificial Intelligence#Generative AI#Real-Time#WebSocket#Streaming#Inference
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API Details
ID
fal-ai:fal-realtime-api
Base URL
wss://realtime.fal.run
Docs
https://fal.ai/docs/model-apis/real-time
Provider
fal
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