Track Cainiao (LP… / AP…) parcels handed off to SpeedX (SPX…) for US metro doorstep delivery.

Cainiao increasingly routes US metro e-commerce parcels (NYC, NJ, LA, Chicago, Dallas, Miami) to SpeedX (SPX + 15 or 21 chars) instead of USPS after airport customs clearance. Querying GET /v1/track/LP... on lastscanned surfaces the secondary SpeedX tracking number in message ('Handed to SpeedX as SPX...'), and querying GET /v1/track/SPX... decodes SpeedX's live last-mile scans.

Barcode transition: Cainiao to SpeedX

When Cainiao clears customs and hands off to SpeedX, lastscanned surfaces the secondary tracking number in the top-level message field.

Cainiao lookup →Format & check-digit detector →
Origin / middle-mile carrier
Cainiao (cainiao)
Cainiao Waybill
LP + 14–17 digits or AP + 14 digits (/^(LP\d{14,17}|AP\d{14})$/)
Origin example
LP00658129481029
Final-mile carrier
SpeedX (speedx)
SpeedX Barcode
SPX + 15 or 21 alphanumeric chars (/^SPX([0-9A-Z]{15}|[0-9A-Z]{21})$/)
Final-mile example
SPXUS0123456789123
Extracted in .message
Handed to SpeedX as SPXUS0123456789123

How the Cainiao → SpeedX handoff works

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

1. Query the Cainiao LP… waybill
Call GET /v1/track/LP... to retrieve China export sorting, linehaul flight, and US customs release scans.
2. Extract the SPX… barcode from message
lastscanned populates message with 'Handed to SpeedX as SPX...' as soon as the final-mile SpeedX barcode is issued.
3. Track SpeedX final-mile delivery
Call GET /v1/track/SPX... to get SpeedX sortation hub scans (Jamaica NY, Elk Grove Village IL, Compton CA), driver out_for_delivery events, and delivery confirmation.
Cainiao regex
/^(LP\d{14,17}|AP\d{14})$/ (Pass 1).
SpeedX regex
/^SPX([0-9A-Z]{15}|[0-9A-Z]{21})$/ (Pass 1, carrier code: speedx).
Zero SpeedX decoding boilerplate
lastscanned normalizes SpeedX's base64 proto-JSON responses and event codes (203 delivered, 200 out_for_delivery) automatically.

Chain Cainiao → SpeedX 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 Cainiao origin waybill (extracts final-mile barcode in .message):
curl "https://api.lastscanned.com/v1/track/LP00658129481029" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

# 2. Query the extracted SpeedX barcode:
curl "https://api.lastscanned.com/v1/track/SPXUS0123456789123" \
  -H "Authorization: Bearer lsk_live_YOUR_API_KEY"

TypeScript (Automatic Handoff Chaining)

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

// Extract secondary barcode from top-level message ("Handed to SpeedX as SPXUS0123456789123")
const handoff = originPkg.message?.match(/^Handed to (.+?) as ([A-Z0-9-]+)$/i);
if (handoff) {
  const [, , lastMileNumber] = handoff;
  const destRes = await fetch(`https://api.lastscanned.com/v1/track/${encodeURIComponent(lastMileNumber)}`, { headers });
  const destPkg = await destRes.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"

Cainiao to SpeedX Last-Mile Handoff Tracking FAQ

How do I find my SpeedX (SPX…) tracking number from a Cainiao LP… number?
Look up the LP… number on lastscanned or call GET /v1/track/LP.... The top-level message field returns 'Handed to SpeedX as SPX...'.
Does lastscanned support both 18-character and 24-character SpeedX SPX… numbers?
Yes. lastscanned auto-detects both SPX + 15 alphanumeric characters (18 total, such as SPXUS...) and SPX + 21 alphanumeric characters (24 total, such as SPXCN...) in Pass 1.

Other carrier handoff guides

Explore cross-border last-mile barcode extraction and domestic USPS consolidator overrides across all 31 carriers.

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

All 31 supported carriers

Major carriers

Regional and last mile

Cross-border