# Sirenic UK Beneficial Owners (PSC) Lookup

> Sirenic UK Beneficial Owners (PSC) Lookup is a paid API for AI agents from api.sirenic.eu, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Retrieves live UK beneficial ownership data (Persons with Significant Control) for a given Companies House company number, including individual and corporate PSCs with control types and notification dates.

## Facts

- Endpoint: GET https://api.sirenic.eu/v1/eu/entreprise/GB/:company_number/beneficiaires-effectifs
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sirenic-uk-beneficial-owners-psc-lookup-f00d6940
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_19UWdrK9ysa8ijP_iArEp

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sirenic-uk-beneficial-owners-psc-lookup-f00d6940
```

Example prompt: Pull the current beneficial owners (PSCs) for UK company number 00446915 from the Companies House register — I need to see who has significant control, their ownership bands, and the notification dates.

## When to prefer this

Use this endpoint when you need official, live UK beneficial ownership data sourced directly from Companies House for KYC, AML, due diligence, or compliance workflows. It is the only open-data UBO register for the UK — unlike France, the UK has a publicly accessible PSC register. Prefer this over scraping Companies House directly for structured, low-cost, normalized output. Use it when you need natures of control detail (ownership/voting bands) and want ceased PSCs optionally included.

## Known failure modes

- Unknown or invalid company number returns 404 and the payment is cancelled
- Company exists but has filed no PSC records returns an empty list
- Malformed company number (missing leading zeros) may return 404
- Rate limiting or upstream Companies House API outage may cause 5xx errors
- Companies with complex group structures may have corporate PSCs requiring further recursive lookups

## How this service works

UK beneficial owners (PSC, persons with significant control) live from Companies House for AML, KYB and compliance: individual and corporate-entity PSCs with natures of control (ownership/voting bands), notification dates, plus official PSC statements. Ceased PSCs excluded by default (inclure_cesses=true adds them with their ceased date). Beyond French-registry parity — France exposes no open UBO register. Month+year of birth only, no addresses. Open Government Licence v3.0 (Companies House).

## Output

Returns a structured object containing active PSC records for the company — individual persons and corporate entities listed as having significant control — each with their nature of control (ownership and voting bands such as 25-50%, 50-75%, 75%+), notification date, and month/year of birth (individuals only, no addresses). Optionally includes ceased PSCs in a separate array with their cessation date when inclure_cesses=true. Also includes any official PSC statements filed at Companies House.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "company_number"
     ],
     "properties": {
      "company_number": {
       "type": "string",
       "description": "Companies House company number, leading zeros required (00446915). Unknown number returns 404, payment cancelled."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "inclure_cesses": {
       "type": "string",
       "description": "Set to \"true\" to add ceased PSCs in `beneficiaires_cesses` (with their cesse_le). Omitted or any other value: ceased PSCs are excluded."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sirenic-uk-beneficial-owners-psc-lookup-f00d6940/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sirenic.eu](https://www.zero.xyz/host/api.sirenic.eu/llms.txt)