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The SyncServerlessClient is the synchronous Python client for interacting with fal Serverless. Its namespaces and methods mirror the CLI so you can automate the same workflows from Python.

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Import and Initialize

from fal.api import SyncServerlessClient

client = SyncServerlessClient(
    host=None,     # Optional. Override API host
    api_key=None,  # Optional. If omitted, read from env/profile
    profile=None,  # Optional. Named profile to use
    team=None,     # Optional. Team context for runner ops
)

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Overview of Namespaces

  • client.apps.* — corresponds to fal apps ...
  • client.runners.* — corresponds to fal runners ...
  • client.deploy(...) — corresponds to fal deploy ...

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Apps Namespace

Manage your applications: list them, view runners for a specific app, and adjust scaling.

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List Applications (fal apps list)

apps = client.apps.list()

# Optional app name filter
filtered = client.apps.list(filter="stable")

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List App Runners (fal apps runners my-app)

app_runners = client.apps.runners("my-app")

# Optional filters
recent = client.apps.runners("my-app", since=datetime.now() - timedelta(hours=1)) # last hour
running_only = client.apps.runners("my-app", state=["running"])                   # by state

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Scale Application (fal apps scale)

Maps to CLI flags in fal apps scale. Any omitted option keeps the current value. 
client.apps.scale(
    "my-app",
    keep_alive=300,            # seconds
    max_multiplexing=1,
    max_concurrency=10,
    min_concurrency=1,
    request_timeout=600,       # seconds
    startup_timeout=900,       # seconds
    machine_types=["GPU-H100", "GPU-H200"],
    regions=["us-east-1", "us-west-2"],
    concurrency_buffer=1,
    concurrency_buffer_perc=10,
)

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Runners Namespace

List and manage runners.

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List Runners (fal runners list)

all_runners = client.runners.list()

# Recent runners only
last_10_min = client.runners.list(since=datetime.now() - timedelta(minutes=10))

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Deploy (fal deploy)

Programmatic equivalent of fal deploy. If app_ref is omitted, discovery behavior matches the CLI (e.g., pyproject.toml). 
# Auto-discover
client.deploy()

# Deploy from a file path
client.deploy("path/to/myfile.py")

# Deploy a specific class in a file
client.deploy("path/to/myfile.py::MyApp")

# Deploy by existing app name
client.deploy("my-app")

# With options mirroring CLI flags
client.deploy(
    app_ref="path/to/myfile.py::MyApp",
    app_name="myapp",
    auth="public",                # "private" | "public"
    strategy="rolling"            # "recreate" | "rolling"
    reset_scale=True,             # use previous scaling if False
)

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Reference

For the complete Python API surface (types, dataclasses, and method signatures), see the auto-generated API reference.
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