SunYou (顺友物流) (sunyou)→USPS / Last-Mile (usps)

Track SunYou (顺友物流) SY… cross-border e-commerce parcels through customs and USPS delivery.

SunYou (顺友物流 / SunYou Post) ships lightweight cross-border marketplace parcels from Shenzhen, Yiwu, and Hong Kong using SY… (SYUA, SYUS, SYRM, LP…) barcodes that hand off to USPS, Royal Mail, and national postal operators.

Try a live tracking number:

Barcode transition: SunYou (顺友物流) to USPS / Last-Mile

Domestic SunYou (顺友物流) parcels keep the same 92… / 420… barcode from pickup to mailbox. Pass ?carrier=sunyou to inspect middle-mile sort scans before USPS induction.

SunYou (顺友物流) lookup →USPS / Last-Mile lookup →Format & check-digit detector →
Origin / middle-mile carrier
SunYou (顺友物流) (sunyou)
SunYou SY… / LP… barcode (13–14 chars)
^(SY[A-Z]{2}\d{9}|SY\d{11}|LP\d{14})$
Origin example
SYUS012345678
Final-mile carrier
USPS / Last-Mile (usps)
USPS 22-digit IMpb or postal delivery barcode
^(92\d{20,24}|[A-Z]{2}\d{9}[A-Z]{2})$
Final-mile example
9200190302951157303009
Middle-mile resolution
Arrived at destination airport / Handed over to USPS

How the SunYou → USPS handoff works

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

1. SunYou Shenzhen / Hong Kong acceptance
SunYou scans the SYUS… or SYUA… parcel at its Shenzhen sorting center and manifests export air freight.
2. Destination airport arrival & customs clearance
The shipment arrives at the US gateway airport, clears customs, and transfers to the domestic postal consolidator.
3. USPS induction & mailbox delivery
USPS inducts the parcel for local sorting and final residential mailbox delivery.
SunYou query
GET /v1/track/SYUS012345678?carrier=sunyou
Auto-detection
SY… prefixes automatically resolve to the SunYou adapter
Postal handoff
Query linked 92… USPS numbers via GET /v1/track/{number}

Chain SunYou → USPS in code or MCP

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

Get an API keyWISMO agent guide

REST (Synchronous GET)

# 1. Query SunYou (顺友物流) middle-mile scans on the 92… barcode:
curl "https://api.lastscanned.com/v1/track/SYUS012345678?carrier=sunyou" \
  -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 SunYou (顺友物流) 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=sunyou`, { 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"

SunYou (SY…) to USPS & International Postal Cross-Border Handoff Tracking FAQ

Does a SunYou SYUA or SYUS tracking number work on USPS.com?
Proprietary SunYou barcodes like SYUA… or SYBA… are non-S10 consolidator barcodes and will not resolve on USPS.com unless SunYou attaches a secondary 92… USPS IMpb label. Querying ?carrier=sunyou on lastscanned tracks the full SunYou journey.
How long does SunYou take after Arrived at destination country airport?
Economy SunYou airmail typically takes 5–12 business days after destination airport arrival to clear consolidated customs and reach your local post office.

Other carrier handoff guides

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

"USPS Currently Awaiting Package" 92… Checker →Tracking Number Format & Check-Digit Detector →

All 273 supported carriers

Major carriers

Regional and last mile

International posts and couriers

Cross-border