# GET /uk/postcode: $0.003 per call

UK postcode lookup: coordinates, country, region, local authority, ward, parish, parliamentary constituency, LSOA/MSOA and official ONS codes. Pass ?postcode=SW1A1AA, or ?lat=51.5&lon=-0.12 to find the nearest postcodes. Official ONS data via postcodes.io.

- **Price:** $0.003 in USDC, the same on Base, Solana, Polygon, Arbitrum. Failed calls are never charged.
- **Free trial:** yes, 20 free calls a day from Claude, Cursor or any MCP client ([set-up](/mcp/setup)).
- **Answers cached for:** 1 day(s)
- **Data sources:** postcodes.io (free, OGL)
- **Lane:** UK & EU open data ([OpenAPI](/openapi/uk-data.json))
- **Live health:** [status page](/status)

## Free sample

See an answer for the demo input first, free (no payment, 10 a minute): [https://aayatai.com/sample/uk-postcode](/sample/uk-postcode). It is a stored real answer when we have one, otherwise an example marked `"kind": "illustrative"`.

```bash
curl "https://aayatai.com/sample/uk-postcode"
```

## 1. See the price (free)

Call it without paying: you get `402 Payment Required` and a `PAYMENT-REQUIRED` header with the exact price and where to pay.

```bash
curl -i "https://aayatai.com/uk/postcode?postcode=SW1A+1AA"
```

## 2. Pay and call (TypeScript)

```bash
npm install @x402/fetch @x402/evm viem
```

```ts
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// A wallet used only by your agent, holding a little USDC on Base.
const account = privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`);
const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await pay("https://aayatai.com/uk/postcode?postcode=SW1A+1AA");
console.log(await res.json());
```

## 3. Or as an MCP tool

```ts
// MCP server: https://aayatai.com/mcp (Streamable HTTP). With the x402 MCP client (see /start):
const result = await client.callTool("uk-postcode", {"postcode":"SW1A 1AA"});
```

## Inputs

- `postcode` (string): Full UK postcode (spaces optional).
- `lat` (number): Latitude, for a nearest-postcode search.
- `lon` (number): Longitude, for a nearest-postcode search.

Bad inputs are rejected with HTTP 400 before any payment is asked for.

## Example answer

```json
{
  "found": true,
  "results": [
    {
      "postcode": "SW1A 1AA",
      "outcode": "SW1A",
      "country": "England",
      "region": "London",
      "district": "Westminster",
      "county": null,
      "ward": "St James's",
      "parish": "Westminster, unparished area",
      "constituency": "Cities of London and Westminster",
      "lsoa": "Westminster 018C",
      "msoa": "Westminster 018",
      "latitude": 51.501009,
      "longitude": -0.141588,
      "eastings": 529090,
      "northings": 179645,
      "codes": {
        "admin_district": "E09000033"
      }
    }
  ],
  "licence": "Contains public sector information licensed under the Open Government Licence v3.0."
}
```

## Related

- [GET /uk/area](/services/uk-area) ($0.01): UK area profile for a postcode or postcode district (e.g.
- [GET /uk/food-hygiene](/services/uk-food-hygiene) ($0.005): UK food hygiene ratings (Food Standards Agency) for restaurants, takeaways, shops and other food businesses: rating (0-5 or Pass/Improvement Required in Scotlan
- [GET /uk/house-prices](/services/uk-house-prices) ($0.01): Sold house prices for any England or Wales postcode from HM Land Registry Price Paid data (1995 to date): each sale's price, date, address, property type (detac
- [GET /uk/company](/services/uk-company) ($0.005): UK company check from Companies House: search by ?q=name, or pass ?number=00445790 for the full profile: status, type, incorporation date, registered office, SI
- [GET /uk/bank-holidays](/services/uk-bank-holidays) ($0.001): Official UK bank holidays (England & Wales, Scotland, Northern Ireland) from GOV.UK.
- [GET /eu/vat](/services/eu-vat) ($0.005): Check an EU VAT number live against the European Commission's VIES system: valid or not, and the registered company name and address where the member state shar
- [GET /eu/fx](/services/eu-fx) ($0.002): Official ECB euro foreign-exchange reference rates for about 30 currencies, converted to any base (GBP, USD, EUR...).
- [GET /eu/lei](/services/eu-lei) ($0.005): Look up legal entities in the global LEI register (GLEIF, 2.9M+ companies and funds worldwide): by LEI (with direct and ultimate parent companies), by name, or 

New here? [Getting started in 60 seconds](/start). All services: [Aayat AI](/).