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Agent402 UK Company Number Format Validator
x402
Agent402 UK Company Number Format Validator is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Normalises and validates UK Companies House company number format (zero-padding and SC/NI prefix handling) using pure logic, without performing a live register lookup.
Price / call$0.001
Success—
StatusDown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a JSON object indicating whether the input is a valid Companies House number format (valid_format boolean), the normalised/zero-padded company number string, and a jurisdiction_hint (e.g. 'england-wales', 'scotland', 'northern-ireland') inferred from any prefix.
Example use cases
Gate bad numbers before paid lookup
“Before I pay to pull a Companies House profile, can you verify that 'SC12345' is a properly formatted UK company number and tell me what it would look like normalised?”
Bulk data cleanup pipeline
“I've got a spreadsheet column of UK company numbers that look inconsistently formatted — some are missing leading zeros and some have lowercase prefixes. Can you normalise '00123456', 'sc045678', and 'NI789' so they're all in the correct Companies House format?”
Onboarding form validation
“A user just typed 'NI999' as their company number in our onboarding form — can you check whether that's a valid format for a UK Companies House number and return the corrected version if it needs zero-padding?”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/validate/uk-company-numberWhen to prefer
Use this endpoint when you need to sanitise or normalise a raw UK company number string before passing it downstream to a paid Companies House profile lookup — it costs a fraction of a live lookup and catches formatting errors (missing zero-pads, wrong case, unknown prefixes) without consuming credits on a live register call. Prefer this over client-side regex when you need canonical normalisation logic with jurisdiction hint output.
Side effects
- Malformed or empty input string returns valid_format: false
- Prefix not recognised as a known UK jurisdiction prefix returns invalid
- No live register check performed — a well-formatted but non-existent number still returns valid_format: true
- Very long or obviously non-numeric strings without a valid prefix treated as invalid
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| company_number | string | Company number (digits or SC/NI/… prefix) |
Output
Schema · Response
{
"type": "json",
"example": {
"valid_format": true,
"company_number": "00123456",
"jurisdiction_hint": "england-wales"
}
}Tags
x402
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