lcsc-toolkit

An unofficial Python client for LCSC that supports product search using the public site, and authenticated order history by logging in as a specific account.

WARNING: Everything here is reverse-engineered from LCSC's site, and may break without notice!

This library was created as part of the Testomatic PCBA Register PCB testing and assembly management system, but doesn't depend on it.

Disclaimer

• This is not affiliated with, endorsed by, or supported by LCSC in any way.
• Both modules work by replaying internal API calls LCSC's own website makes: lcsc_toolkit.search is the same public search box anyone gets without logging in, lcsc_toolkit.orders are the ones made while logged in to your account. The order-history side is the one with real account risk: automated access to a logged-in account area may fall outside LCSC's terms of service. Think carefully before using it against your actual account. search isn't as risky because it's the same data everyone gets while browsing the site anonymously.
• There is no LCSC sandbox/staging environment. The endpoints this toolkit module relies on could change or disappear at any time. For orders, repeated automated access could also trigger LCSC's bot detection and affect your account.
• Just in case I haven't been clear enough yet: USE AT YOUR OWN RISK!

Install

pip install lcsc-toolkit          # core library (requests-only)
pip install lcsc-toolkit[auth]    # + Playwright, needed only for interactive login capture
playwright install chromium       # if you installed the [auth] extra

Install from PyPI using pip install lcsc-toolkit, or install from a local checkout with pip install -e .

Order history

LCSC has no OAuth-style API key or refresh-token flow for this. You log in to lcsc.com like a normal user, including any CAPTCHA/2FA, and the library reuses the resulting session cookies. There's no way to automate the login itself, and this library doesn't try to.

from lcsc_toolkit.orders import LcscSession

# One-time, interactive: opens a real browser window and waits for you
# to log in by hand.
session = LcscSession.capture_interactively()
session.save("session.json")

Once captured, the session cookies work with plain requests. No browser is needed for actual API calls.

from lcsc_toolkit.orders import LcscSession, OrdersClient

session = LcscSession.load("session.json")
client = OrdersClient(session)

page = client.list_orders()
for order in page.orders:
    print(order.order_code, order.web_order_status, order.order_amount)

detail = client.get_order_detail(page.orders[0].uuid)
for line in detail.line_items:
    print(line.product_code, line.purchase_quantity, line.real_price)

See examples/capture_session.py and examples/list_recent_orders.py for runnable versions of the above.

You can start by running the capture_session.py example which will attempt to launch a browser on your computer for you to log in to LCSC and then write the session cookie to disk, then run list_recent_orders.py to verify that it successfully connects to LCSC using the saved cookie.

Check whether a session is actually still logged in with check_valid() (or OrdersClient.check_session(), an identical passthrough) - a single lightweight authenticated request, useful right after loading a session you didn't just capture yourself, before trusting it in a script:

if not session.check_valid():
    raise SystemExit("Session expired - run capture_session.py again")

There's no automated way to detect a session has expired ahead of time. When an OrdersClient call finds that the session has expired, it raises lcsc_toolkit.errors.SessionExpiredError. The fix is to capture a new session:

from lcsc_toolkit.errors import LcscApiError, SessionExpiredError

try:
    page = client.list_orders()
except SessionExpiredError:
    raise SystemExit("Session expired - run capture_session.py again")
except LcscApiError as exc:
    raise SystemExit(f"LCSC request failed: {exc}")

SessionExpiredError is a subclass of LcscApiError, so code that only catches LcscApiError still catches it. Other failures raise a plain LcscApiError; if one persists, check the session with check_valid() too, since only one form of expiry has been confirmed so far (see Open questions below). How long a session actually stays valid in the first place hasn't been worked out yet and may be unpredictable, depending on what LCSC do with their servers: reboots, garbage cleanup, etc.

Running on a headless server

Interactive login (capture_interactively()) needs a real, visible browser window, which a headless server doesn't have. The fix is to split capture and use across two machines:

1. Run examples/capture_session.py on any machine with a display (your desktop) to log in and produce a session file.
2. Copy that file to the server.
3. On the server, LcscSession.load(...) + OrdersClient - this only needs requests, not Playwright, so the server never needs the [auth] extra or a browser at all.

This works because the session is just cookies. There's nothing browser- or machine-specific baked into them. Confirmed working: a session captured on a desktop, copied to a separate remote machine on a different network, authenticated successfully there. LCSC does not appear to tie the session to the originating IP address. Still, run check_valid() right after copying a session file over, before wiring anything up to run unattended, as confirmation for your own setup.

Product search

No login or session required. SearchClient is simple page loads.

from lcsc_toolkit.search import SearchClient

client = SearchClient()
product = client.search("C17179461")  # SKU or manufacturer part number

if product:
    print(product.product_model, product.stock_number, product.detail_url)
    for pb in product.price_breaks:
        print(pb.quantity, pb.price, pb.currency)
else:
    print("No match")

search() returns None for no match, a Product otherwise. Errors (request failures, unexpected response shapes) raise lcsc_toolkit.errors.LcscApiError, same as orders.

How LCSC's order API works

Discovered by watching personalCenter/order/list's own network traffic while logged in (see examples/explore_network.py), not from any published LCSC documentation so YMMV.

• List: GET https://wmsc.lcsc.com/wmsc/order/page, query params queryType, createStartTime, createEndTime, productMpn, keyword, productKeyword, webOrderStatus, currentPage, pageSize, sortType. Response: {"code":200,"result":{"currPage","pageRow","totalPage", "totalRow","dataList":[{"uuid","orderCode","webOrderStatus", "paymentStatus","orderAmount","currencyType","createTime","trackingCode", "expressType",...}]}}. orderCode (eg: WM2607080353) is the human-readable order number; uuid is what the detail endpoint needs.
• Detail: GET https://wmsc.lcsc.com/wmsc/order/detail?orderUuId=<uuid>
  • note the param name (orderUuId) doesn't match the list row's field name (uuid) or casing. Result includes order-level fields plus orderProductVOList, the line items: productCode (LCSC's own SKU, eg: C17179461), productMpn, description, purchaseQuantity, unitPrice (pre-discount list price), realPrice (the actual per-unit price paid), totalPrice/realTotalAmount.
• Session cookies work via plain requests, no browser needed post-login. Confirmed by replaying both endpoints above with just the saved cookies and getting the same data back as the browser did.
• Sessions are portable across machines/networks. A session captured on one machine, copied to a separate remote machine, authenticated successfully from there. See Running on a headless server, above.

How LCSC's search API works

• Search: POST https://wmsc.lcsc.com/ftps/wm/search/v3/global, JSON body {keyword, secondKeyword, brandIdList, catalogIdList, isStock, isAsianBrand, isDeals, isEnvironment}. Response result.scene is either FULL_MATCH (product is result.exactMatchResult[0]) or REDIRECT_PRODUCT_DETAIL (search didn't resolve to one exact product: see below).
• Product detail fallback: on REDIRECT_PRODUCT_DETAIL, result.tipProductDetailUrlVO.productCode identifies a product page at https://www.lcsc.com/product-detail/<productCode>.html, but that's an HTML page, not a JSON API. The data is embedded in a <script id="__NEXT_DATA__"> tag as JSON (props.pageProps.webData). SearchClient fetches that page and regex-extracts the blob rather than parsing HTML properly, since the actual product data is just JSON sitting inside a <script> tag. Falls back to the (much sparser) tip object itself if that data isn't there or dataIsNull is true.
• Pricing: productPriceList entries ({ladder, discountPrice}) map to price-break quantity/price pairs. Like orders, LCSC's search API only ever returns a "$" symbol, not an ISO currency code, so currency is assumed USD.
• No authentication of any kind: confirmed by this being the same data visiting lcsc.com and searching anonymously returns.

Open questions

Not yet answered, and worth knowing before relying on this for anything unattended (e.g. a scheduled sync). All of these are specific to orders:

• How long does a captured session stay valid? If it's short-lived, a scheduled/unattended sync isn't practical without solving re-authentication some other way. There's no refresh-token equivalent to automate that, unlike an OAuth-based API.
• What does an expired-session response look like? Partly answered (2026-10-13). Observed once, in production use: an expired session made the order-list endpoint (/wmsc/order/page) return HTTP 200 with a JSON body whose code was 302 and whose msg was empty. Capturing a new session fixed it. OrdersClient now raises SessionExpiredError for code 302 from any order endpoint. Still unconfirmed:
  • whether code 302 always means "session expired" (one observation only, though no other meaning has been seen);
  • whether the order-detail endpoint reports expiry the same way (assumed so, not observed);
  • what check_valid()'s login-check endpoint returns for an expired session. check_valid() is unchanged: it still raises LcscApiError ("couldn't determine") for anything except the confirmed valid-session shape, rather than assuming expiry looks the same there.
• Whether there's a lighter-weight way to keep a session alive (e.g. periodic no-op requests) versus needing a fresh interactive login each time it lapses.

Project layout

src/lcsc_toolkit/
├── errors.py             # LcscToolkitError, LcscApiError, SessionExpiredError
├── orders/
│   ├── session.py        # LcscSession: capture/save/load a login session, check_valid()
│   ├── client.py         # OrdersClient: list_orders(), iter_orders(), get_order_detail(), check_session()
│   ├── types.py          # OrderSummary, OrdersPage, OrderLineItem, OrderDetail (line items and orders both expose a stable `uuid`; OrderSummary/OrderDetail have `detail_url`)
│   └── _http.py          # shared BASE_URL/headers for the wmsc.lcsc.com API
└── search/
    ├── client.py         # SearchClient: search() (no login required)
    └── types.py          # Product, PriceBreak
examples/
├── capture_session.py    # interactive login capture (needs the [auth] extra)
├── list_recent_orders.py # minimal usage example of the confirmed order-history API
└── explore_network.py    # diagnostic tool for discovering further order-related endpoints
tests/

License

MIT - see LICENSE.