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Guide · British Isles

UK + Ireland (British Isles) KYB API — one key, two registries

Companies House (UK) and the CRO (Ireland) under one REST API and one Bearer key. Post-Brexit, counterparty risk doesn't stop at the Irish Sea — verify both with a single parameter.

Updated 8 October 2026

Why "British Isles" is one verification problem now

Since Brexit, UK fintechs, PSPs and lenders increasingly deal with Dublin-incorporated, EU-passported counterparties — many UK groups hold an Irish entity to keep an EU footprint. Verifying those counterparties today usually means stitching together a manual CRO search, a second data API, and an analyst's time. The British Isles bundle collapses that into a ?country=IE parameter on the same endpoint you already use for the UK.

What each side covers

  • United Kingdom (Companies House) — daily bulk + delta, PSC / beneficial-ownership data, officers, filing events (see the UK company data API guide).
  • Ireland (CRO) — company records from the CRO Open Data Portal (CC BY 4.0): company status, registered address, Eircode, NACE code, incorporation/dissolution dates. Company-level — no Irish UBO (the RBO register's public access is legally restricted). See the Ireland company data API guide.

One key, both countries

# UK company by Companies House number
curl ".../companies/search?country=GB&company_number=00445790" -H "Authorization: Bearer rk_live_..."

# Irish company by name
curl ".../companies/search?country=IE&name=ryanair" -H "Authorization: Bearer rk_live_..."

Same endpoints, same response shape, same key — just switch the country parameter. No separate Irish contract, no second integration.

Who uses this

  • UK PSPs and EMIs with an Irish e-money entity for EU passporting.
  • MiCA CASPs authorised via the Central Bank of Ireland verifying counterparties on both sides.
  • B2B lenders and marketplaces checking cross-border group structures (UK parent, Irish subsidiary).

Pricing

Both countries are included in every tier — no per-country fee:

  • Starter trial — 14 days, 500 credits, card required, nothing charged for 14 days
  • Starter — €9.99/mo, 1,000 credits/month
  • Professional — €29.99/mo, 10,000 credits/month, sanctions screening (beta)
  • Scale — €99.99/mo, 50,000 credits/month

Related

Frequently asked questions

Can one API cover both UK and Irish companies?
Yes. Prometiam exposes Companies House (UK) and the CRO (Ireland) under one schema and one Bearer key. The same endpoints accept ?country=GB and ?country=IE, so a UK fintech onboarding an Irish subsidiary verifies both without a second integration or contract.
What Irish company data is available?
From the CRO Open Data Portal (CC BY 4.0): company status, registered address, Eircode, NACE code, incorporation and dissolution dates. Ireland is company-level — directors/officers and beneficial ownership (RBO) are not yet included (Irish RBO public access is legally restricted).
Does the UK side include beneficial ownership?
Yes — UK Companies House data includes the PSC (Persons with Significant Control) register, so UK beneficial-ownership data is available. Irish UBO is not, due to the restricted RBO. The British Isles bundle is explicit about which country has which.