# Verify UK Business Check

> Verify UK Business Check is a paid API for AI agents from verify-uk.verifyuk.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Checks a UK business against Companies House, HMRC VAT, and FCA registers to surface trust signals, warnings, and cautions

## Facts

- Endpoint: GET https://verify-uk.verifyuk.workers.dev/v1/business/check?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/verify-uk-business-check-f043729d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OdSsdwA4_DTuobVVjGIsW

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 verify-uk-business-check-f043729d
```

Example prompt: Can you run a business check on UK company number 12345678 and also verify their VAT number GB123456789 — I want to know if there are any warnings or cautions before I pay them?

## When to prefer this

Use this endpoint when you need to verify the legitimacy of a UK-registered business using official public data sources (Companies House, HMRC, FCA) before making a payment, signing a contract, or onboarding a vendor. It is particularly valuable when you have a company number, VAT number, or FCA FRN and want cross-register validation with trust signals. Prefer this over generic company search tools when you specifically need UK regulatory cross-checks and a structured warning/caution summary. It requires no account or API key and charges $0.02 USDC per call via x402.

## Known failure modes

- Company number not found on Companies House — returns no match signal
- VAT number format invalid — may return validation error or format signal
- FCA FRN not found — returns unregistered signal
- Name-only search returns ambiguous results if multiple businesses share the name
- Payment not made or insufficient USDC — 402 Payment Required response
- Rate limiting or network timeout on upstream UK register APIs

## How this service works

Pay-per-call UK verification tools for AI agents: validators, business checks and website trust checks from official UK public data. Pay with USDC via x402 - no account, no API key.

## Output

A JSON object containing an array of trust signals (each with a code, severity level, and human-readable message) and a summary object with counts of warnings and cautions plus a headline string like '1 warning, 1 caution - review before trusting or paying.'

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "frn": {
       "type": "string",
       "description": "Optional FCA Firm Reference Number"
      },
      "name": {
       "type": "string",
       "description": "Business name (used if no number)"
      },
      "vat_number": {
       "type": "string",
       "description": "Optional VAT number to verify with HMRC"
      },
      "company_number": {
       "type": "string",
       "description": "Companies House number (preferred)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "signals": [
   {
    "code": "vat_name_mismatch",
    "level": "warning",
    "message": "VAT is registered to a different business."
   }
  ],
  "summary": {
   "cautions": 1,
   "headline": "1 warning, 1 caution - review before trusting or paying.",
   "warnings": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verify-uk-business-check-f043729d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from verify-uk.verifyuk.workers.dev](https://www.zero.xyz/host/verify-uk.verifyuk.workers.dev/llms.txt)