siftingio

Official Python SDK for the SiftingIO market data API — sync and async REST clients plus a live WebSocket, fully type-hinted.

• Sync and async. SiftingClient for scripts, notebooks, and pandas; AsyncSiftingClient for asyncio services. Same method names, same shapes.
• Typed. Every endpoint, parameter, and response is annotated (py.typed); responses are plain dicts with TypedDict shapes for editor autocomplete.
• Resource-mapped. Methods mirror the API docs 1:1.
• Batteries included. Auto-retry on 429/5xx, gzip negotiation, cursor auto-pagination, and an auto-reconnecting WebSocket client.

Install

pip install siftingio

Requires Python 3.9+. Depends only on httpx and websockets.

Quick start (sync)

from siftingio import SiftingClient

client = SiftingClient(api_key="sft_...")  # or env-driven; see below

# Live price
trade = client.last.trade("crypto", "BTCUSD")
print(trade["p"], trade["t"])

# Company fundamentals
profile = client.stocks.profile("AAPL")
ratios = client.stocks.ratios("AAPL")

# Historical bars (gzip handled for you)
bars = client.crypto.bars("BTCUSD", start="2024-01-01", interval="1h")
print(len(bars["data"]), "bars")

client.close()  # or use `with SiftingClient(...) as client:`

Quick start (async)

import asyncio
from siftingio import AsyncSiftingClient

async def main():
    async with AsyncSiftingClient(api_key="sft_...") as client:
        quote = await client.last.quote("crypto", "ETHUSD")
        print(quote["b"], quote["a"])

asyncio.run(main())

Authentication

Get an API key from your SiftingIO dashboard. It's sent as the X-API-Key header. You can also supply it dynamically (e.g. from a secrets manager or a rotating token):

client = SiftingClient(get_api_key=lambda: read_secret("SIFTING_API_KEY"))

# Async: the hook may be sync or async
async_client = AsyncSiftingClient(get_api_key=fetch_token_async)

Configuration

SiftingClient(
    api_key="sft_...",       # X-API-Key header
    get_api_key=callable,    # dynamic alternative to api_key
    base_url="https://api.sifting.io",      # override for proxies/staging
    ws_url="wss://stream.sifting.io/ws/v1", # WebSocket endpoint
    timeout=30.0,            # per-request timeout (seconds)
    max_retries=2,           # automatic retries for 429 / 5xx
    headers={"X-Trace": "…"},# extra headers on every request
    http_client=httpx.Client(...),  # bring your own httpx client
)

AsyncSiftingClient takes the same arguments (with httpx.AsyncClient).

Resources

Namespace	Endpoints	Highlights
client.last	/v1/last/*	trade, quote, tvl — live snapshots
client.stocks	/v1/fnd/stocks/*, /v1/hist/stocks/*	search, profile, filings, financials, ratios, insiders, events, screener, bars, …
client.filers	/v1/fnd/filers/*	holdings — 13F positions
client.markets	/v1/fnd/markets/*	list, status, hours, calendar
client.forex	/v1/hist/forex/*	bars
client.crypto	/v1/hist/crypto/*	bars
client.dex	/v1/fnd/dex/*	wallet portfolios
client.economic_calendar	/v1/fnd/economic-calendar	list

Python keyword params that collide with reserved words use a trailing underscore: pass from_=... (sent to the API as from).

Pagination

List endpoints return {"data": [...], "meta": {...}} with an opaque meta["next_cursor"]. Stream every page with auto_paginate (sync) or aauto_paginate (async):

from siftingio import auto_paginate, collect_all

for filing in auto_paginate(lambda cursor: client.stocks.filings("AAPL", cursor=cursor, form="10-K")):
    print(filing["accession"], filing["filed_at"])

insiders = collect_all(lambda cursor: client.stocks.insiders("TSLA", cursor=cursor), max_items=100)

from siftingio import aauto_paginate

async for filing in aauto_paginate(lambda cursor: client.stocks.filings("AAPL", cursor=cursor)):
    ...

Live WebSocket

Async:

async with client.ws() as socket:   # client = AsyncSiftingClient(...)
    socket.on("tick", lambda t: print(t["s"], t.get("p")))
    socket.on("error", lambda e: print("server error:", e["code"], e["message"]))
    await socket.subscribe("cex", ["BTCUSD", "ETHUSD"])  # products: cex|dex|fx|us|tvl
    async for frame in socket:       # or rely purely on handlers
        ...

Sync:

socket = client.ws()                 # client = SiftingClient(...)
socket.on("tick", lambda t: print(t["s"], t.get("p")))
socket.connect()
socket.subscribe("cex", ["BTCUSD"])
for frame in socket.stream():
    ...
socket.close()

Subscriptions are tracked and replayed automatically on reconnect, so you subscribe once and keep receiving data across drops. In the sync client, handlers run on a background thread.

Error handling

from siftingio import SiftingAPIError, SiftingConnectionError

try:
    client.stocks.profile("NOPE")
except SiftingAPIError as err:
    err.status       # 404
    err.code         # "unknown_ticker"
    err.retry_after  # seconds, on 429
    err.request_id   # X-Request-Id — quote this in support tickets
    err.body         # full parsed error body
except SiftingConnectionError as err:
    err.timeout      # True if it was a client-side timeout

The client automatically retries 429 and 5xx up to max_retries, honoring Retry-After.

License

MIT