British annual-accounts API (Companies House)

GET/v1/eu/entreprise/GB/{company_number}/comptes

Price: $0.01
Free quota: Included
Family: Europe · annual accounts

Parameters
Parameter	Where	Example
`company_number`	path · required	`00095407`

What is charged

200Ed25519-signed response, charged at the route's price
402Signed x402 quote, nothing is debited
4xxUnknown or invalid identifier, never charged
5xxUpstream source unavailable, never charged

See a real response (free) Get the quote for /v1/eu/entreprise/GB/{company_number}/comptes

curlx402MCPPythonJS

curl "https://api.sirenic.eu/v1/eu/entreprise/GB/00095407/comptes" \
  -H "X-Api-Key: $SIRENIC_KEY"

# 1. The quote, without paying anything: the route answers 402 with its amount
curl -i "https://api.sirenic.eu/v1/eu/entreprise/GB/00095407/comptes"

# 2. The paid call: the x402 client settles the quote and replays the request
npx x402-fetch "https://api.sirenic.eu/v1/eu/entreprise/GB/00095407/comptes"

# Or over MCP, in Claude Code / Cursor / an agent
claude mcp add --transport http sirenic https://api.sirenic.eu/mcp

import os, requests

r = requests.get(
    "https://api.sirenic.eu/v1/eu/entreprise/GB/00095407/comptes",
    headers={"X-Api-Key": os.environ["SIRENIC_KEY"]},
)
print(r.json())

const r = await fetch("https://api.sirenic.eu/v1/eu/entreprise/GB/00095407/comptes", {
  headers: { "X-Api-Key": process.env.SIRENIC_KEY },
});
console.log(await r.json());

200 OK · extractx-credits-charged: 0.01

{
 "pays": "GB",
 "id_national": "00095407",
 "nombre_depots": 1,
 "depots": [
  {
   "date_cloture": "2025-12-31",
   "debut_exercice": "2025-01-01",
   "denomination": "COSSART,GORDON AND CO.LIMITED",
   "devise": "GBP",
   "referentiel": "Micro-entities",
   "type_comptes": "FullAccounts",
   "nb_postes_decodes": 14,
   "nb_postes_courant": 7
  }
 ],
 "telechargement": "GET /v1/eu/entreprise/GB/{company_number}/comptes/{date_cloture} — l'exercice décodé ($0.05, JSON : bilan complet, effectif moyen, résultat lorsqu'il est déposé + comparatif N-1 tel que publié)",
 "source": "Companies House — Free Accounts Data Product (download.companieshouse.gov.uk), instances iXBRL déposées",
 "licence": "Contains public sector information licensed under the Open Government Licence v3.0 (Companies House)"
}

Dated snapshot from 2026-07-29, truncated to one item per array. It is not live data. The full extract is served free of charge from the samples surface, and the schema from the OpenAPI document.

Full real response ↗

What the route returns

Catalogue description, exactly as agents read it:

UK annual accounts filings list — financial statements from iXBRL in the official Companies House Accounts Data Product (Open Government Licence v3.0). Query: /v1/eu/entreprise/GB/00095407/comptes (8-character company number, leading zeros included, SC/NI/OC prefixes supported). Every decoded balance sheet date with period, entity name, currency, accounting framework (micro-entity, FRS 102...) and accounts type. Electronically filed accounts only — absence does not mean no accounts exist.

Expected identifier

British company number (8 characters, digits or alphabetic prefix).

A wrongly formatted identifier in the path returns 400 and is not billed — but it costs you a round trip. It is the leading cause of failed calls on the foreign routes. A search parameter, by contrast, is cleaned up: unsupported characters are stripped and the usable query is served.

Price and billing

Price: $0.01. The authoritative amount is the one in the 402 quote returned by the route itself, not this text, which derives from the same grid but is still just a page.

An error response cancels the payment: a 400, 404 or 503 is never billed. An upstream outage closes the route with a 503 rather than serving a degraded response.

Neighbouring routes

/v1/eu/entreprise/GB/{company_number}/comptes/{date_cloture}: $0.05
/v1/eu/entreprise/GB/{company_number}/dirigeants: $0.01
/v1/eu/entreprise/GB/{company_number}/beneficiaires-effectifs: $0.02

How you pay

Every route is paid per call, in USDC or EURC on the Base network, over the x402 protocol: no account to create, no API key, no subscription. The first call returns a 402 quote your client settles, then replays the call. A failed call is never billed.

Would you rather have a euro invoice and prepaid credits? That is in preparation, and we will not announce a date until it is open. Write to contact@sirenic.eu and we will let you know when it opens.

Paid responses are Ed25519-signed: you can later prove what was served to you, and when. The whole catalogue is free to read in the OpenAPI document and in llms.txt.

One call, end to end

# x402 client (npm): the 402 quote is settled and the call replayed automatically
npx x402-fetch https://api.sirenic.eu/v1/entreprise/552032534

# Or over MCP, in Claude Code / Cursor
claude mcp add --transport http sirenic https://api.sirenic.eu/mcp

Routes used and pricing

Route	Price	Sample	What it returns
`/v1/eu/entreprise/GB/{company_number}/comptes`	$0.01	free sample	UK annual accounts filings list — financial statements from iXBRL in the official Companies House Accounts Data Product (Open Government Licence v3.0). Query: /v1/eu/entreprise/GB/00095407/comptes (8-character company number, leading zeros included, SC/NI/OC prefixes supported). Every decoded balance sheet date with period, entity name, currency, accounting framework (micro-entity, FRS 102...) and accounts type. Electronically filed accounts only — absence does not mean no accounts exist.

Take it further

No account to create, no key to request: the first step is free and shows you exactly what you would be buying.

See a real response (free) Get the quote for /v1/eu/entreprise/GB/{company_number}/comptes Get notified about euro packs

British annual accounts