Identify which carrier issued a tracking number using a deterministic, versioned signature
Identify which carrier issued a tracking number using a deterministic, versioned signature set - prefixes, lengths, carrier check digits and UPU S10 structure - returning the carrier, how distinctive the match is, every ranked candidate with typed evidence, and the parsed S10 details. No upstream call and no carrier account required. Use when: Which carrier is this tracking number from?
1000 (raw units)
price
2
calls / 30d
2
unique payers
2026-09-17
updated
Provider
api.eckari.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x9d6b6fdB04040a55d58B24ff4C90C08cf6083C8f",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000",
"maxTimeoutSeconds": 60
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"tracking_number": "1Z 879E93 03 4683 4440"
},
"type": "http"
},
"output": {
"example": {
"data": {
"candidates": [
{
"carrier_id": "ups",
"carrier_name": "UPS",
"evidence": {
"check_digit": "ups_mod10",
"country_hint": null,
"length": 18,
"prefix": "1Z",
"s10_origin_country": null
},
"format_id": "ups_1z",
"match_score": 0.98,
"match_strength": "distinctive"
}
],
"carrier": {
"id": "ups",
"name": "UPS"
},
"formats_matched": 1,
"input": {
"normalised": "1Z879E930346834440",
"original": "1Z 879E93 03 4683 4440"
},
"match_score": 0.98,
"match_strength": "distinctive",
"signature_version": "1.1.0",
"upu_s10": null
},
"meta": {
"capability": "parcel.detect_carrier",
"freshness": "static",
"source": "eckari_carrier_signatures",
"version": "2.0.0"
}
},
"type": "json"
}
},
"routeTemplate": "/v1/parcels/detect-carrier",
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"destination_country": {
"description": "Optional ISO 3166-1 alpha-2 destination country hint. Used only as a small tie-breaker; it never invents a candidate.",
"pattern": "^[A-Za-z]{2}$",
"type": "string"
},
"origin_country": {
"description": "Optional ISO 3166-1 alpha-2 origin country hint. Used only as a small tie-breaker; it never invents a candidate.",
"pattern": "^[A-Za-z]{2}$",
"type": "string"
},
"tracking_number": {
"description": "Tracking or consignment number. Spaces and hyphens are removed and letters upper-cased before matching (4-40 letters and digits after normalisation). Digits and letters are never altered.",
"maxLength": 60,
"minLength": 4,
"pattern": "^[A-Za-z0-9 -]+$",
"type": "string"
}
},
"required": [
"tracking_number"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"id": {
"maxLength": 128,
"minLength": 16,
"pattern": "^[a-zA-Z0-9_-]+$",
"type": "string"
},
"required": {
"type": "boolean"
}
},
"required": [
"required"
],
"type": "object"
}
}
}Use it
curl
curl "https://api.eckari.com/v1/parcels/detect-carrier" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://api.eckari.com/v1/parcels/detect-carrier");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://api.eckari.com/v1/parcels/detect-carrier")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/4314.json, and this resource appears in /discovery/resources and /discovery/search.