# Verify UK Company Number Validator

> Verify UK Company Number Validator is a paid API for AI agents from verify-uk.verifyuk.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).

Validates a UK Companies House company number, checking format correctness and normalising it, with a hint about the company type (e.g. Scottish).

## Facts

- Endpoint: GET https://verify-uk.verifyuk.workers.dev/v1/validate/company-number?utm_source=zero.xyz
- Price: $0.001/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-company-number-validator-832ae440
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F2DHvUXUUkLJPBpxJMzHW

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-company-number-validator-832ae440
```

Example prompt: Can you check whether 'SC123456' is a valid UK company number and tell me what type of company it might be?

## When to prefer this

Choose this endpoint when you need a lightweight, format-level validation of a UK Companies House company number without making a live lookup against the Companies House API. It is ideal for pre-screening user input, data quality checks, and KYC pipeline steps where you want instant, pay-per-call validation with no account setup. If you need live company details (officers, filings, status), use a full Companies House API integration instead.

## Known failure modes

- Missing or empty 'number' query parameter returns a 400 error
- Malformed company number (wrong length or invalid characters) returns valid=false with no normalised value
- Payment not included or failed x402 flow returns 402 Payment Required
- Service unavailable returns 503 with no validation result

## 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 indicating whether the company number is valid (true/false), the normalised form of the number (e.g. 'SC123456'), and a human-readable hint about the company type (e.g. 'Scottish company', 'England and Wales company').

## 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": [
      "number"
     ],
     "properties": {
      "number": {
       "type": "string",
       "description": "Company number"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "valid": true,
  "normalised": "SC123456",
  "company_type_hint": "Scottish company"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verify-uk-company-number-validator-832ae440/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)