Track Canadian e-commerce orders shipped via Stallion Express across the US border into USPS Ground Advantage & Priority Mail.

Stallion Express enables Canadian Shopify, Etsy, Amazon, and eBay merchants in Toronto, Vancouver, Montreal, and Calgary to print US domestic USPS labels (94001… / 920019…), clear CBP Section 321 / informal entry by truck, and induct directly into USPS border hubs in New York, Washington, and Michigan.

Try a live tracking number:

Barcode transition: Stallion Express to USPS

Domestic Stallion Express parcels keep the same 92… / 420… barcode from pickup to mailbox. Pass ?carrier=stallion to inspect middle-mile sort scans before USPS induction.

Origin / middle-mile carrier
Stallion Express (stallion)
Stallion Express ID or USPS 22-digit IMpb (94001… / 920019…)
^(9[2345]\d{19,24}|SE[0-9A-Z]{8,16})$
Origin example
9400111899223197428490
Final-mile carrier
USPS (usps)
USPS 22-digit IMpb (94001… / 920019…)
^9[2345]\d{19,24}$
Final-mile example
9400111899223197428490
Middle-mile resolution
Accepted at USPS Origin Facility NIAGARA FALLS NY / ROCHESTER NY

How the Stallion Express → USPS handoff works

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

1. Canadian drop-off & Mississauga/Richmond sort
The Canadian merchant drops the parcel at a Stallion Express branch with a USPS label attached; USPS shows Pre-Shipment while Stallion sorts it in Canada.
2. Daily cross-border linehaul & CBP clearance
Stallion Express trucks the consolidated manifest across the US border (Lewiston/Buffalo NY, Blaine WA, or Port Huron MI).
3. Direct USPS hub induction
Stallion injects the trays directly into a USPS Regional Facility (e.g., Rochester NY or Seattle WA), triggering the first live USPS acceptance scan.
Stallion Express query
GET /v1/track/9400111899223197428490?carrier=stallion
USPS query
GET /v1/track/9400111899223197428490?carrier=usps
Pre-advice resolution
Pass ?carrier=stallion to see Canadian branch and border-crossing scans before USPS induction

Chain Stallion Express → 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 Stallion Express middle-mile scans on the 92… barcode:
curl "https://api.lastscanned.com/v1/track/9400111899223197428490?carrier=stallion" \
  -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/9400111899223197428490" \
  -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 Stallion Express 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=stallion`, { 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"

Stallion Express Canada-to-US Cross-Border to USPS Handoff Tracking FAQ

Why does my Canadian Etsy or Shopify order have a USPS tracking number stuck on Pre-Shipment?
Because the seller shipped from Canada using Stallion Express. USPS only scans the 94001… barcode after Stallion trucks the parcel across the US border and drops it at a NY, MI, or WA USPS facility—usually 24 to 48 hours after Canadian drop-off.
How can I see the Canadian scans before USPS receives the package?
Query GET /v1/track/{number}?carrier=stallion on lastscanned to inspect Stallion Express branch acceptance and US border linehaul checkpoints.

Other carrier handoff guides

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

All 273 supported carriers

International posts and couriers

Cross-border