Companies House

Enable the Companies House connector in your fastn dashboard, then let each customer authenticate their own Companies House account. fastn handles the OAuth flow, token storage and refresh per tenant, so there is no Companies House client code in your app and no per-customer branch in your codebase. Setup is 4 steps.

Yes. Every connection is scoped to the individual customer, so each authorises their own Companies House account and only ever sees their own lookups, results and reports. That per-tenant isolation is the point of an embedded integration: you support the long tail of customer setups without maintaining an integration per customer.

Yes. The same connection is exposed to your agents through the fastn MCP gateway, with permissions scoped per tenant and every call audited. An agent verifies a company registration before proceeding.

fastn does. When Companies House changes an endpoint, deprecates a field or alters its auth, the fix lands in the connector rather than in your backlog, and your customers' connections keep working.

Each customer's own. Quota and cost land on the customer that caused them rather than on a shared key you have to meter and re-bill, and one heavy customer cannot exhaust another's allowance.

Per tenant, with a window that matches how fast the underlying data actually moves. Companies House is a read source rather than a system of record, so the same query returns the same answer until the source changes, and caching is the difference between a sustainable integration and one that exhausts a customer's allowance on a busy page.

A common starting point: verify a UK company at the point of entry so bad data never lands in your product. Teams also use it for the other use cases listed above, and expose it to agents for governed reads and writes.

It is included. Pricing is based on connected accounts, not on how many connectors you enable, so adding Companies House does not change your per-connector cost. You can start free with 3 connected accounts.