KYB API: business verification file with per-block provenance

GET/v1/kyb/{siren}

Price: $0.15
Free quota: No
Family: KYB and reports

Parameters
Parameter	Where	Example
`siren`	path · required	`552032534`

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, or a counted total below the list read (compte_incoherent), never charged

See a real response (free) Get the quote for /v1/kyb/{siren}

curlx402MCPPythonJS

curl "https://api.sirenic.eu/v1/kyb/552032534" \
  -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/kyb/552032534"

# 2. The paid call: the x402 client settles the quote and replays the request
npx x402-fetch "https://api.sirenic.eu/v1/kyb/552032534"

# 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/kyb/552032534",
    headers={"X-Api-Key": os.environ["SIRENIC_KEY"]},
)
print(r.json())

const r = await fetch("https://api.sirenic.eu/v1/kyb/552032534", {
  headers: { "X-Api-Key": process.env.SIRENIC_KEY },
});
console.log(await r.json());

200 OK · extractx-credits-charged: 0.15

{
 "siren": "552032534",
 "identite": {
  "denomination": "DANONE",
  "nature_juridique": "5599",
  "activite_principale": "70.10Z",
  "etat_administratif": "actif",
  "date_creation": "1955-01-01",
  "siege": {
   "siret": "55203253400703",
   "code_postal": "75009",
   "commune": "PARIS"
  },
  "nombre_etablissements": 19
 },
 "tva_intracommunautaire": "FR27552032534",
 "alertes_bodacc": {
  "procedures_collectives": [],
  "radiations": [],
  "total_annonces": 107
 },
 "contentieux": {
  "couvert": true,
  "exhaustivite": "partielle",
  "couverture": {
   "taux_rattachement_mesure": 0.618
  },
  "synthese": {
   "nombre_decisions": 0
  },
  "decisions_recentes": [],
  "tronque_dans_le_rapport": false,
  "consulte_le": "2026-09-25T03:30:03Z"
 },
 "finances": {
  "nombre_exercices": 8,
  "exercices": [
   {
    "date_cloture": "2024-12-31",
    "chiffre_affaires": 1030000000,
    "resultat_net": 592000000
   }
  ]
 },
 "criblage_sanctions": {
  "statut": "rapprochements_partiels_seulement",
  "cibles": [
   {
    "cible": "DANONE",
    "role": "entreprise",
    "nombre_correspondances": 0,
    "correspondances": []
   }
  ],
  "cibles_non_criblees": []
 },
 "score_completude": 100,
 "blocs_manquants": [],
 "data_freshness": "identité : stock Sirene mensuel (2026-09-01)"
}

Dated snapshot from 2026-09-25, 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:

Company lookup KYB: Know Your Business verification of a French company in one call, official company data for due diligence, compliance and customer onboarding: identity, officers, BODACC legal alerts (insolvency, deregistration), commercial-court decisions (Judilibre), filed financials, sanctions screening of the company and each officer against the 6 official lists, computed VAT number and a completeness score. Per-block provenance: every block states its official register and as-of date.

Expected identifier

9-digit company number.

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: $0.15. 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.

What this route does not do

No beneficial owners for France: the register has not been publicly accessible since the 2022 ruling of the Court of Justice of the European Union. This file does not fill that gap and does not claim to.

Neighbouring routes

/v1/kyb/batch: $0.105 / entity
/v1/sanctions/check: $0.02
/v1/entreprise/{siren}/dossier: $0.005

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/kyb/{siren}`	$0.15	free sample	Company lookup KYB: Know Your Business verification of a French company in one call, official company data for due diligence, compliance and customer onboarding: identity, officers, BODACC legal alerts (insolvency, deregistration), commercial-court decisions (Judilibre), filed financials, sanctions screening of the company and each officer against the 6 official lists, computed VAT number and a completeness score. Per-block provenance: every block states its official register and as-of date.

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/kyb/{siren} Get notified about euro packs

KYB file for a French company