The Companies House plumbing you'd rather not build: parsed iXBRL filings, resolved PSC chains, and director networks - cached and rate-limit-proof. Clean JSON, one key.
No Companies House API key needed. One Registrum key covers everything.
# Request
curl -H "X-API-Key: reg_live_..." \
"https://api.registrum.co.uk/v1/company/00445790"
# Response
{
"company_name": "TESCO PLC",
"company_age_years": 104,
"turnover": 68190000000,
"accounts_overdue": false,
"credits_remaining": 49
}
Find out which clients have unverified directors before their filing is blocked.
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Structured financials parsed from iXBRL. Director networks. Beneficial ownership chains. ECCTA compliance. All in clean JSON — no CH API key needed.
iXBRL filings parsed into clean JSON — turnover, net assets, profit/loss, employees. Current and prior year, all values in actual GBP. Explicit data_quality metadata so you know exactly what's available.
Try with any company →One endpoint traverses the full board network to 2 degrees. Returns all companies sharing directors, sorted by connection strength. Discover related entities not obvious from a single filing.
Try with any company →The PSC register decoded and traversable. Natures of control in plain English. Corporate PSCs include their company number — pass it to the chain endpoint to find the ultimate beneficial owner.
Try with any company →Monitor director and PSC identity verification under the Economic Crime and Corporate Transparency Act 2023. One call returns a risk rating, verified count, and list of unverified persons.
See live demo →Submit 500 company numbers in one POST. We enrich them in the background, automatically managing the CH rate limit. Poll for results — no timeouts, no queuing logic on your side.
POST /v1/batch
{"company_numbers": ["00445790", ...]}
→ {"batch_id": "3fa85f64-...", "status": "queued"}How it works →Enter your email below. Your free key arrives instantly — no credit card, no forms.
# 15 free calls/day — no credit card X-API-Key: reg_live_...
Pass the API key in the header. Any HTTP client works — curl, Python, Node, whatever you use.
curl -H "X-API-Key: reg_live_..." \
"https://api.registrum.co.uk/v1/company/00445790"JSON back in milliseconds. Cached, enriched, with explicit metadata about what's available.
{
"company_name": "TESCO PLC",
"turnover": 68190000000
}No setup fees. No hidden costs. Upgrade or cancel any time.
| Feature | Free | Web | Pro | Enterprise |
|---|---|---|---|---|
| Company profile & filings | ✓ | ✓ | ✓ | ✓ |
| Director list | ✓ | ✓ | ✓ | ✓ |
| Structured financials (iXBRL) | ✓ | ✓ | ✓ | ✓ |
| Fuzzy company search | ✓ | ✓ | ✓ | ✓ |
| PSC beneficial ownership | ✓ | ✓ | ✓ | ✓ |
| Async batch enrichment | quota-limited | quota-limited | ✓ | ✓ |
| Director network (depth 1) | ✓ | ✓ | ✓ | ✓ |
| Director network (depth 2) | — | — | ✓ | ✓ |
| PSC chain & UBO traversal | — | — | ✓ | ✓ |
| ECCTA compliance monitoring | — | — | ✓ | ✓ |
| KYB pack | — | — | ✓ | ✓ |
| SLA uptime commitment | — | — | ✓ | ✓ |
| Companies watched (webhooks) | 1 | 5 | 25 | Negotiated |
Batch enrichment consumes credits per company processed (1 credit each). Free and Web plans are quota-limited by their monthly allowance. Director network depth 2 and PSC chain are Pro/Enterprise only as each request can consume up to 30+ upstream API calls.
Watching a whole client book for ECCTA? Watch up to 250 companies with alerts when a company's compliance risk changes - no API plan required.
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