# Eckari UK Company Registered Office Lookup

> Eckari UK Company Registered Office Lookup is a paid API for AI agents from api.eckari.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the current registered office address of a UK company from Companies House by company number

## Facts

- Endpoint: GET https://api.eckari.com/v1/companies/uk/%7Bcompany_number%7D/registered-office
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/eckari-uk-company-registered-office-lookup-5893aba3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dqDaCFkfeaQkKtCrb_-Rs

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 eckari-uk-company-registered-office-lookup-5893aba3
```

Example prompt: What is the registered office address for UK company number 00445790? I need the full address as it appears at Companies House.

## When to prefer this

Use this endpoint when you need the current, live registered office address of a UK company directly from Companies House by company number. Prefer this over scraping company websites or using business directories when you need the authoritative legal address. It is especially useful for KYB (Know Your Business) workflows, compliance checks, due diligence, invoice address validation, or building UK company data enrichment pipelines.

## Known failure modes

- Invalid or non-existent company number returns an error or empty data
- Company dissolved or struck off may return stale or missing address data
- Malformed company number format causes a bad request response
- API authentication or payment failure (x402) blocks the request
- Rate limiting or network timeout may cause intermittent failures

## How this service works

Eckari is the machine-native utility layer for capabilities agents do not already have. Every route is a provider-neutral capability with channel pricing for Eckari account keys and accountless x402 payment.

## Output

A JSON object containing the full registered office address broken into components (address_line_1, address_line_2, locality, postal_code, country, premises, care_of, po_box, region), plus a pre-formatted single-line address string, the company name, and company number. Metadata includes source (companies_house), version, freshness indicator (live), and capability identifier.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "address": {
    "po_box": null,
    "region": null,
    "care_of": null,
    "country": "United Kingdom",
    "locality": "Welwyn Garden City",
    "premises": null,
    "postal_code": "AL7 1GA",
    "address_line_1": "Tesco House, Shire Park",
    "address_line_2": "Kestrel Way"
   },
   "single_line": "Tesco House, Shire Park, Kestrel Way, Welwyn Garden City, AL7 1GA, United Kingdom",
   "company_name": "TESCO PLC",
   "company_number": "00445790"
  },
  "meta": {
   "source": "companies_house",
   "version": "2.0.0",
   "freshness": "live",
   "capability": "company.uk.registered_office"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eckari-uk-company-registered-office-lookup-5893aba3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.eckari.com](https://www.zero.xyz/host/api.eckari.com/llms.txt)