KYB Essentials — United Kingdom

Quick verification of a UK company. Confirms the company exists in the official registry, validates VAT registration (from registry data or a VAT number you provide), screens against international sanctions lists, and checks LEI status.

4 steps x402 eligible kyb-essentials-uk

What it runs

UK Company Data
Source: Companies House (UK Government)
EU VAT Validation
Source: VIES (EU VAT Information Exchange System, European Commission)
Sanctions Check
Source: Dilisense consolidated (OFAC SDN, EU FSF, UN SC, UK Sanctions List, CH SECO, BIS, World Bank, EBRD, ADB + 125 national sanctions/debarment lists; full attribution at https://dilisense.com/en/sources/sanction-sources)
LEI Lookup
Source: GLEIF (Global Legal Entity Identifier Foundation)

The answer returns every step’s result, so your agent can show or check each one.

Inputs

Field	Type	Required	What it is
`vat_number`	string	No	EU VAT number with country prefix (e.g. ATU14189108). Optional — used for VIES validation when the registry lookup does not return one (e.g. AT, SK); auto-derived from registry data where possible.
`company_number`	string	Yes	UK Companies House number

How to call it

# Needs an API key. The whole check is charged once, at the listed price.
curl -X POST https://api.strale.io/v1/solutions/kyb-essentials-uk/execute \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "inputs": {
      "company_number": "00445790"
    },
    "max_price_cents": 150
  }'

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i -X POST https://api.strale.io/x402/v2/solutions/kyb-essentials-uk \
  -H 'Content-Type: application/json' \
  -d '{
    "company_number": "00445790"
  }'

The bundle’s published example input.

Limitations

Data from Companies House API — LLPs and Scottish LPs included, but sole traders and partnerships are not registered
From step: UK Company Data
What to do instead: For sole traders, check HMRC's contractor verification or use the business name with google-search
VIES can be unavailable or throttle requests under unpublished per-member-state limits. Transient faults are retried, and cached results, including older fallback results, can be returned during outages.
From step: EU VAT Validation
What to do instead: Lookups within 48 hours can use cached results; if VIES is unavailable and no cached result exists, retry later.
Results can be cached for 48 hours, and national registry changes can take a further 24 hours to appear in VIES. Check the national tax authority directly for same-day registration or deregistration confirmation.
From step: EU VAT Validation
What to do instead: For real-time same-day verification, contact the national tax authority directly.
Swiss UID validation returns valid or invalid only, without a company name or address. This tool does not perform the separate enrichment lookup, whose public service is limited to 20 requests per minute.
From step: EU VAT Validation
What to do instead: For Swiss company name + address, call the swiss-company-data capability.
GB VAT numbers return a credentials-pending error when the HMRC connection is not configured.
From step: EU VAT Validation
What to do instead: Use vat-format-validate for GB format checks; it does not confirm VAT registration.
Sanctions lists updated daily from OFAC, EU, and UN sources — newly sanctioned entities may take up to 24 hours to appear
From step: Sanctions Check
What to do instead: For same-day compliance, subscribe to OFAC's RSS feed and cross-reference against today's additions
Name matching uses fuzzy logic — common names may produce false positives. Always verify flagged results
From step: Sanctions Check
What to do instead: Filter results by match confidence score and verify flagged entities against the primary sanctions list PDF
Covers entities with LEI registration via GLEIF — only ~2.5 million entities worldwide have LEIs, primarily financial institutions
From step: LEI Lookup
What to do instead: If no LEI is found, search by company name and jurisdiction; consider that smaller entities may not have an LEI