Track Chukou1 (出口易 / CKY) cross-border e-commerce parcels handed off to USPS.

Chukou1 (出口易 / BFE) operates cross-border dedicated lines and overseas warehouses in the US, UK, Germany, and Australia, inducting Chinese direct-mail parcels into USPS Ground Advantage (920019… / 926129…) after US port-of-entry customs clearance.

Try a live tracking number:

Barcode transition: Chukou1 (出口易) / Export Linehaul to USPS Ground Advantage

Domestic Chukou1 (出口易) / Export Linehaul parcels keep the same 92… / 420… barcode from pickup to mailbox. Pass ?carrier=yanwen to inspect middle-mile sort scans before USPS induction.

Origin / middle-mile carrier
Chukou1 (出口易) / Export Linehaul (yanwen)
Chukou1 CKY… / EC… or USPS 92… pre-advice barcode
^(CKY[A-Z0-9]+|92\d{20,24})$
Origin example
9200190302951157303009
Final-mile carrier
USPS Ground Advantage (usps)
USPS 22-digit IMpb barcode
^92\d{20,24}$
Final-mile example
9200190302951157303009
Middle-mile resolution
Departed Shipping Partner Facility, USPS Awaiting Item

How the Chukou1 → USPS handoff works

Follow the parcel across both networks without waiting on asynchronous webhooks or losing visibility at the handoff boundary.

1. Chukou1 Guangzhou / Shenzhen acceptance
Chukou1 receives the parcel at its Pearl River Delta processing center and transmits electronic shipping partner pre-advice to USPS.
2. Trans-Pacific air cargo & CBP release
The shipment flies to LAX, ORD, or JFK, clears US customs, and transfers to a domestic postal induction facility.
3. USPS Regional Facility & final delivery
USPS scans Arrived at USPS Regional Origin Facility and delivers the package via Ground Advantage.
USPS query
GET /v1/track/9200190302951157303009?carrier=usps
Consolidator fallback
Also check ?carrier=yanwen or ?carrier=4px when Chukou1 co-loads on partner air linehaul
Shipping Partner status
Normalizes Departed Shipping Partner Facility into in_transit

Chain Chukou1 → USPS in code or MCP

Resolve both legs synchronously in TypeScript, curl, or your AI support agent via Streamable HTTP MCP.

REST (Synchronous GET)

# 1. Query Chukou1 (出口易) / Export Linehaul middle-mile scans on the 92… barcode:
curl "https://api.lastscanned.com/v1/track/9200190302951157303009?carrier=yanwen" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

# 2. Query USPS final-mile scans on the same barcode:
curl "https://api.lastscanned.com/v1/track/9200190302951157303009" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

TypeScript (Automatic Handoff Chaining)

const headers = { Authorization: `Bearer ${process.env.LASTSCANNED_API_KEY}` };
const res = await fetch(`https://api.lastscanned.com/v1/track/${encodeURIComponent(number)}`, { headers });
let pkg = await res.json();

// If USPS is still waiting on the consolidator parcel, query Chukou1 (出口易) / Export Linehaul middle-mile hubs:
if (pkg.carrier === "usps" && pkg.status === "label_created" && /^(420\d{5})?9[2345]/.test(number)) {
  const mid = await fetch(`https://api.lastscanned.com/v1/track/${encodeURIComponent(number)}?carrier=yanwen`, { headers });
  if (mid.ok) pkg = await mid.json();
}

Remote MCP (Claude Code / Cursor / ChatGPT)

claude mcp add --transport http lastscanned https://mcp.lastscanned.com \
  --header "Authorization: Bearer lsk_live_YOUR_API_KEY"

Chukou1 (出口易 / BFE) Export Linehaul to USPS Ground Advantage Handoff Tracking FAQ

Why does my Chukou1 package say USPS Currently Awaiting Package for a week?
Chukou1 generates the US domestic USPS label in Guangzhou or Shenzhen before the parcel boards an international flight. USPS only logs its first physical scan after the parcel clears US customs.
Does Chukou1 also ship from domestic US warehouses?
Yes. Chukou1 operates US fulfillment centers in California, New Jersey, and Kentucky that ship directly via USPS Ground Advantage, UPS, and FedEx.

Other carrier handoff guides

Explore cross-border last-mile barcode extraction and domestic USPS consolidator overrides across all 273 carriers.

All 273 supported carriers

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Cross-border