UK Company Number Format Check

Machine Tool Interface · company-number-format

$0.005 / callPaid per call · 0 free tier No signup

Check supported UK company-number syntax. No Companies House lookup, entity-existence check or active-registration verification.

Honest Scope Guarantee

Format-only: no public check digit exists for this identifier, so "valid" means well-formed, not mathematically proven. Existence of the record is not checked.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (Paid-only route — unauthenticated calls return HTTP 402 Payment Required)

curl -X POST https://api.code402.dev/v1/tools/company-number-format/call \
  -H "content-type: application/json" \
  -d '{"company_number":"12345678"}'

This route is paid-only (0 free calls/day); every unauthenticated request returns an HTTP 402 Payment Required challenge with its payment terms. Machines use USDC on Base; card credits (instant Stripe checkout) are enabled in this deployment. Signed XDR-1 receipts authenticate recorded service claims, not independent settlement, delivery or zero-knowledge proofs.

Input Parameters

Field	Type	Meaning & Constraints
`company_number` (REQUIRED)	`string`	8 digits, or 2 letters + 6 digits.

Response Format

Deterministic JSON payload fields: tool, valid, normalized, country, reason, scope. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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