# Postal/ZIP Code Lookup: City, State & Coordinates (60+ Countries)

> Postal/ZIP Code Lookup: City, State & Coordinates (60+ Countries) is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Resolves a postal or ZIP code to city name, state/region, and geographic coordinates for 60+ countries worldwide.

## Facts

- Endpoint: POST https://twin.unykorn.org/geo/postal-code?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/postal-zip-code-lookup-city-state-coordinates-60-countries-9d80b861
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G2-0g3bVYO8WFJFm6wGQE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability postal-zip-code-lookup-city-state-coordinates-60-countries-9d80b861 -d '<json body>'
```

Example prompt: What city, state, and coordinates does ZIP code 90210 correspond to in the US?

## When to prefer this

Choose this endpoint when you need a fast, low-cost postal/ZIP code to city/state/coordinates lookup across a broad range of countries (60+) and want pay-per-call pricing via x402 without API key management. Ideal for enriching address data, validating user input, or adding geographic context to records.

## Known failure modes

- Invalid or non-existent postal code returns an error or empty result
- Unsupported country code returns an error
- Missing required postal_code parameter causes a validation error
- Malformed country ISO-2 code may return unexpected results

## How this service works

Postal/ZIP code lookup: city, state, coordinates (60+ countries) — Genesis402 / UnyKorn Operator Network

## Output

Returns the city name, state or region, and geographic coordinates (latitude/longitude) associated with the given postal code and country. Covers 60+ countries worldwide.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "country": {
     "type": "string",
     "description": "optional ISO-2, default us"
    },
    "postal_code": {
     "type": "string",
     "description": "required"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "postal-lookup",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.001,
   "receipt_id": "g402-<16hex>"
  },
  "sources": [
   {
    "ok": true,
    "name": "<source>"
   }
  ],
  "limitations": "<text>",
  "generated_at": "<iso time>",
  "evidence_hash": "sha256:<64hex>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/postal-zip-code-lookup-city-state-coordinates-60-countries-9d80b861/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)