# Serpost Tracking API & MCP

URL: https://docs.lastscanned.com/carriers/serpost

Query live **Serpost** (`serpost`) package status and scan history in a single synchronous `GET` request or MCP tool call.

## Overview & Quick Facts

| Property | Value |
|---|---|
| **Carrier slug (`?carrier=`)** | `serpost` |
| **Brand aliases** | Serpost Peru, Servicios Postales del Perú, Correos del Perú |
| **Category** | National post (Peru) |
| **Region** | Peru |
| **Single-package REST endpoint** | `GET https://api.lastscanned.com/v1/track/{trackingNumber}` |
| **Batch REST endpoint** | `GET https://api.lastscanned.com/v1/track?numbers=RE123456785PE,...` |
| **MCP server (`https://mcp.lastscanned.com`)** | `track_package`, `track_packages`, `list_carriers` |
| **Authentication & pricing** | `Authorization: Bearer lsk_live_...` · 1 free keyless lookup/day per IP |

## Tracking Number Formats & Auto-Detection

| Pass | Rule / Regex | Check Digit | Examples |
|---|---|---|---|
| **Pass 1 (`matches`)** | UPU S10 `..PE`, valid check digit | UPU S10 mod 11 | `RE123456785PE` |
| **Pass 2 (`mayMatch`)** | none | none | none |

S10 numbers ending in `PE` with a valid check digit auto-detect to Serpost. Serpost also tracks mail that arrives from other posts, but those numbers belong to their origin posts, so pass `?carrier=serpost` for them.

## Synchronous `GET` Request & Normalized JSON Response

```bash
curl -s "https://api.lastscanned.com/v1/track/RE123456785PE?carrier=serpost" \
  -H "Authorization: Bearer $LASTSCANNED_API_KEY"
```

```json
{
  "carrier": "serpost",
  "trackingNumber": "RE123456785PE",
  "status": "delivered",
  "statusDescription": "ENVÍO ENTREGADO",
  "service": null,
  "deliveredAt": "2026-03-09T17:12:30Z",
  "deliveredAtLocal": "2026-03-09T12:12:30",
  "signedBy": null,
  "destination": {
    "city": null,
    "state": null,
    "country": "PE"
  },
  "events": [
    {
      "timestamp": "2026-03-09T17:12:30Z",
      "localTime": "2026-03-09T12:12:30",
      "status": "delivered",
      "description": "ENVÍO ENTREGADO",
      "location": null,
      "code": "5"
    },
    {
      "timestamp": "2026-03-09T12:13:46Z",
      "localTime": "2026-03-09T07:13:46",
      "status": "out_for_delivery",
      "description": "ENVÍO EN PROCESO DE DISTRIBUCIÓN",
      "location": null,
      "code": "9"
    },
    {
      "timestamp": "2026-03-02T14:30:00Z",
      "localTime": "2026-03-02T09:30:00",
      "status": "in_transit",
      "description": "ENVÍO ADMITIDO EN ADMINISTRACION POSTAL CUSCO",
      "location": "CUSCO",
      "code": "012"
    }
  ]
}
```

## Notes

- **Language**: Serpost's wording is Spanish and is kept as sent.
- **Check digit**: Serpost matches the *start* of what it is sent, so a number with a bad check digit can return a stranger's parcel. Numbers that fail the S10 check are answered `not_found` without a request.
- **Time zone**: scan times are Peru time (`-05:00`, no daylight saving), printed month first (`03/09/2026` is 9 March).

## Related Resources

- **Regex & check digits**: [Tracking number formats & auto-detection](/formats)