European authorisations of investment firms

What the route returns

Catalogue description, exactly as agents read it:

EU financial authorisations in five official registers, by name or LEI: ESMA Registers (MiFID entities, EU/EEA: status, authority, dates), the ECB list of supervised entities (banking union: significant banks under direct ECB supervision, less significant under national authorities, group, monthly changes), ESMA benchmark administrators and money market funds (fund, manager, status), EIOPA pension institutions (IORP). One integration for the single market; data free at the sources.

Expected identifier

A name, or a 20-character Legal Entity Identifier.

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.

What this route does not do

The ECB list only covers the banking union (21 countries): an absent entity is not “unsupervised”, and zero is conclusive only by LEI — by name, the published spelling decides. A block the source did not return is named in blocs_absents, never served empty.

Neighbouring routes

• /v1/entreprise/{siren}/agrements: $0.02
• /v1/regulateurs/fr/alertes: $0.01

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

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/agrements Get notified about euro packs

Read next

• Checking a provider's authorisation

OpenAPI · llms.txt · Full route catalogue and pricing