# Fuentio

> Verified business decisions, not just company data: Fuentio checks companies in France, Spain and the United Kingdom against the official registers and returns an outcome (verified, partial or unverified), the reasons, the source, the licence, the check date and a proof code.

Status: live. The MCP server and the REST API are open; free API keys work. The website demo searches a snapshot of real records taken 2026-10-06.

Fuentio resolves, reconciles and monitors French and Spanish companies from official registers: every fact with its source, its date and the record behind it.

Built for AI agents: one MCP server and one REST API, with honest gaps: what isn't covered is said, never guessed.

## Coverage

Country by country, with sources and licences: https://fuentio.com/coverage/

- France: the official register of French companies, from the Annuaire des Entreprises (INSEE Sirene + RNE), Licence Ouverte / Etalab 2.0 (https://www.data.gouv.fr/fr/datasets/donnees-des-entreprises-utilisees-dans-lannuaire-des-entreprises/). Lookup by SIREN, SIRET or VAT number; search by name. A closed company is "ceased", never "dissolved". No French insolvency data.
- Spain: company acts published in the BORME, Boletín Oficial del Registro Mercantil (Section A), by the BOE, since 2 January 2009: incorporations, appointments and removals, address changes, dissolutions. Search by name; lookup by Registro Mercantil sheet. Licence: BOE reuse conditions (https://www.boe.es/informacion/aviso_legal/index.php#reutilizacion).
- United Kingdom: every company on the Companies House register, dissolved ones included, from the Companies House Public Data API, Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/): "Contains public sector information licensed under the Open Government Licence v3.0." Lookup by company number (8 characters, e.g. 00445790); search by name. Updated live (the register as it stands; changes streamed). Status, insolvency cases, charges and the latest filings; no officers, no persons with significant control, no insolvency practitioners.
- Every record carries its source, source URL, licence and the time it was last checked. If the register doesn't say it, the answer says unknown.

## Not covered

- Not covered: lookup by Spanish NIF/CIF; financial statements, beneficial owners or credit scores; Spanish history before 2 January 2009.

## Outside coverage

A company outside coverage gets "not covered by an automated source", and the official register's link to check by hand. Not found never means the company doesn't exist.

## Schema

- One schema for all three countries; original-language values are kept next to normalized codes (ISO 20275 legal forms, NACE/ISIC activity) and English labels.
- No person's name in any answer: officers, shareholders and sole traders are not served; the company graph links companies only.

## For AI agents

- MCP server (streamable HTTP): https://api.fuentio.com/mcp
- Tools: list_coverage (free), lookup_company (1 unit), search_companies (2 units), get_company_history (1 unit), verify_company (5 units), resolve_company (2 units), explain_match (1 unit), watch_company (1 unit).
- Answers as JSON, CSV, Excel, Markdown, HTML, XML, NDJSON, Parquet or TSV (`format`), up to 100 rows; Excel and Parquet as 24-hour download links.
- REST API: https://api.fuentio.com
- Setup guide: https://fuentio.com/agents/
- Agent guide (which tool when, identifiers, common mistakes): https://fuentio.com/llms-full.txt
- Docs and quickstart: https://fuentio.com/docs/
- Real answers recorded from the live API: https://fuentio.com/examples/
- Free pilot (send up to 20 companies, get a checked file within 24 hours): https://fuentio.com/pilot/
- Trust (sources, licences, hosting, no person data): https://fuentio.com/trust/

## Pricing (EUR per month, excluding VAT; pay by card through Creem, our merchant of record; the paid key is emailed as soon as the payment clears)

- trial: €0, 20 units a day, no key
- free: €0, 100 units a month
- starter: €49, 2,000 units a month
- growth: €149, 10,000 units a month
- founding_partner: €149, 20,000 units a month — first 10 customers, price locked 12 months
- business: €499, 50,000 units a month
- compliance: €999, 150,000 units a month — onboarding call, support reply within 1 business day, DPA on request, monthly invoice
- enterprise: custom price and volume, on request

Units: Lookup or history = 1 unit · search = 2 units · verification (outcome + proof code) = 5 units, 1 if not found · coverage list = free. Details: https://fuentio.com/pricing/


## Blog

- Companies House API: Getting Started (API Key, Authentication, Search, Company Profile and Rate Limit): https://fuentio.com/blog/companies-house-api-getting-started/ — How to start with the Companies House API (developer.company-information.service.gov.uk): get a key, authenticate, search, read a profile, mind the rate limit.
- How to Verify a UK Company via API: Company Number, Status, Insolvency and a Proof Code: https://fuentio.com/blog/verify-uk-company-api-companies-house/ — A step-by-step tutorial: check a UK company number's format, look the company up, verify it with an outcome and a proof code, read insolvency, handle errors.
- The Nota Simple from Spain's Mercantile Register: What It Shows, What It Costs, and What to Check for Free First: https://fuentio.com/blog/nota-simple-spain-company-register-extract/ — What a Spanish company's nota simple contains, how to order one from the mercantile register, what it costs under the tariff, and what to check free first.
- Company Legal Forms Compared Across France, Spain and the UK (SARL, SAS, S.L., S.A., Ltd, PLC): https://fuentio.com/blog/company-legal-forms-france-spain-uk-compared/ — How French, Spanish and UK company forms line up: SARL and SAS, S.L. and S.A., Ltd and PLC, with their capital and member rules, and how to spot each one.
- How to Verify a Company's Registration Online, in Any Country (Official Registers and the LEI): https://fuentio.com/blog/verify-company-registration-online-any-country/ — How to check a company's registration status online in any country: its official ID and register, the EU's Find a company search, the LEI, and what to keep.
- How to Verify a Business Before Onboarding It: A Practical Guide: https://fuentio.com/blog/verify-business-before-onboarding/ — What to check before you onboard a business: legal existence, status, registration number, official source, insolvency signals and the evidence to keep.
- What Should a Verifiable Company Check Record Contain?: https://fuentio.com/blog/verifiable-company-check-record/ — The checked company, outcome, source, timestamps, evidence, decision reasons and a reference to retrieve it later, and why a receipt isn't a legal certificate.
- How to Check a UK Company's Status (Active, in Liquidation or Closed) Using Companies House Data: https://fuentio.com/blog/uk-company-status-companies-house/ — How to read a UK company's status on Companies House: active or closed, insolvency, filings, charges and accounts, and why accounts rarely show turnover.
- One-Time Verification vs. Continuous Company Monitoring: https://fuentio.com/blog/one-time-verification-vs-continuous-monitoring/ — When an initial company check is enough, which register changes matter later, and how to design monitoring alerts that help instead of overwhelming people.
- How to Verify a French Company: SIREN, SIRET, RNE and INSEE Explained: https://fuentio.com/blog/how-to-verify-a-french-company/ — The French identifiers and official sources, what each record proves, and why a matching SIREN alone isn't a full verification of the company you deal with.
- How to Give an AI Agent Reliable Company Data: https://fuentio.com/blog/give-ai-agent-reliable-company-data/ — Structured outputs, evidence, explicit uncertainty and official sources: how to give an AI agent company data it can rely on, and what to do when it's partial.
- Fuentio Now Covers the United Kingdom: https://fuentio.com/blog/fuentio-covers-united-kingdom/ — UK companies from Companies House, through Fuentio's API and MCP server: the same outcomes, reasons, proof codes and monitoring as in France and Spain.
- From Company Lookup to Verification Decision: A Fuentio API Walkthrough: https://fuentio.com/blog/fuentio-api-walkthrough-lookup-to-verification/ — A real walkthrough of Fuentio's API: coverage, name search, lookup, verification outcomes, proof codes and receipts, with working Python and recorded answers.
- Company Name Matching Is Not Company Verification: https://fuentio.com/blog/company-name-matching-is-not-verification/ — Trading names, spelling variants and look-alike group companies: why a name match isn't a verification, and how identifier-based matching explains itself.
- Build vs. Buy: Should You Build Company Verification In-House?: https://fuentio.com/blog/build-vs-buy-company-verification/ — Integrations per country, source changes, edge cases, support and validation: a decision framework for building company verification yourself or buying it.
- Build a Company Verification API: What Developers Need to Get Right: https://fuentio.com/blog/build-company-verification-api/ — Lookup, matching, outcomes, source attribution, errors, caching and incomplete data: the decisions that make a company verification API trustworthy.
- Automating Supplier Onboarding Without Losing Control of Business Data: https://fuentio.com/blog/automate-supplier-onboarding-company-checks/ — Where company checks fit in supplier creation: register prefill, duplicate detection, review queues and monitoring, while keeping your supplier data clean.
- An Active Company Is Not Always a Safe Company to Onboard: https://fuentio.com/blog/active-company-not-always-safe-to-onboard/ — Registry status, insolvency proceedings and your onboarding decision are three different things. Why an active registration shouldn't mean automatic approval.
- How to Check Spanish Company Changes with BORME (Complete Guide): https://fuentio.com/blog/spanish-company-changes-borme-history/ — A tutorial: find a Spanish company by name, look it up by its registry sheet, read its BORME acts as a dated history with links, and handle the source's limits.
- Audit Receipts: How Fuentio Proves What a Register Said When You Checked: https://fuentio.com/blog/audit-receipts-company-checks-proof/ — How Fuentio's audit receipts work: a SHA-256 hash of the exact data served, a reference to the stored snapshot, and a request ID you can look up for 24 months.
- How to Pay for Fuentio: Secure Checkout With Creem: https://fuentio.com/blog/how-to-pay-for-fuentio-creem-checkout/ — Fuentio's paid plans are sold through Creem, our merchant of record: it runs the checkout, charges your card, invoices you and handles VAT. Plans and steps.
- How to Verify a Company and Get a Proof Code via API (POST /v1/verifications): https://fuentio.com/blog/verify-company-proof-code-api/ — One API call checks a French or Spanish company against its register and returns an outcome, reasons and a proof code anyone can check. Real answers inside.
- A Supplier-Onboarding Check for France and Spain: One Workflow, Two Registers: https://fuentio.com/blog/supplier-onboarding-check-france-spain-workflow/ — Onboard French and Spanish suppliers with one workflow: what to collect, which checks to run in each country, how to decide, what to store, when to re-check.
- Supplier Bank-Detail Change Fraud: The Checks That Stop Fake Supplier Invoices (France and Spain): https://fuentio.com/blog/supplier-bank-detail-change-fraud-checks/ — How fake-supplier and changed-IBAN invoice fraud works, the controls French and Spanish agencies recommend, and what to do if money has already left.
- Insolvency and VAT Checks via API for French and Spanish Companies: https://fuentio.com/blog/insolvency-vat-checks-api-france-spain/ — Two API calls, one unit each: insolvency state from BODACC and the BORME, and a company's EU VAT number with a VIES link. What each answer means.
- Fuentio API Quickstart: Your First Company Lookup, Units, Errors and Retries: https://fuentio.com/blog/fuentio-api-quickstart-first-call-units-errors/ — Get a key (or start keyless), make your first French or Spanish company lookup in curl, Python or JavaScript, read units and errors, and retry the right way.
- How to Find a Spanish Company by Name and Read Its Registro Mercantil Sheet (Hoja): https://fuentio.com/blog/find-spanish-company-by-name-registro-mercantil-sheet/ — Spain's registry gazette doesn't publish tax IDs: find a company by its exact name, then read its Registro Mercantil sheet (hoja) and acts. Free and via API.
- Fuentio MCP in Cursor and VS Code: Step-by-Step Setup: https://fuentio.com/blog/cursor-vscode-mcp-setup-fuentio/ — Add Fuentio's MCP server to Cursor or VS Code in one click or one JSON file, keep your API key out of the repository, and check companies in the editor.
- Fuentio in Claude Code: Step-by-Step MCP Setup and First Company Checks: https://fuentio.com/blog/claude-code-mcp-setup-fuentio/ — Add Fuentio's MCP server to Claude Code with one command, with or without a key, share it with your team, and check French and Spanish companies.
- How to Check Whether a French or Spanish Company Is Insolvent (BODACC and Spain's Insolvency Register): https://fuentio.com/blog/check-french-spanish-company-insolvency/ — Free official ways to see if a French company is in receivership or liquidation, or a Spanish one in concurso, and your short deadline to file a claim.
- How to Check a French Company's Registered Address and Its Establishments (SIRET): https://fuentio.com/blog/check-french-company-address-establishments-siret/ — SIREN or SIRET, head office or branch, real address or shared one: how to check where a French company really is, with free official sources and one API call.
- Build a Supplier-Check Agent With Fuentio's MCP Server (Prompt, Tools and Guardrails): https://fuentio.com/blog/build-supplier-check-agent-mcp/ — Give your AI agent one job: check each new French or Spanish supplier against official registers. Instructions, tool flow, guardrails and real outputs.
- Where to Find Fuentio: Apify, Smithery, Glama and the MCP Registry: https://fuentio.com/blog/where-to-find-fuentio-mcp-marketplaces/ — Fuentio is on Apify, Smithery, Glama, mcpservers.org, RapidAPI, the official MCP Registry and GitHub. Where each listing is, and how to install from it.
- Supplier Onboarding (KYB) in France and Spain in One Call: https://fuentio.com/blog/supplier-onboarding-kyb-france-spain-one-call/ — Company verification with real live answers: Peugeot SA comes back unverified because it ceased, Danone verified, Mercadona partial. Sources and proof codes.
- Checking a Spanish Company: What the BORME Tells You, and What It Doesn't: https://fuentio.com/blog/spanish-company-borme-what-it-tells-you/ — What the BORME says about a Spanish company (registry sheet, acts, address, dissolution) and what it doesn’t: no tax-ID lookup, status often unknown.
- Why Every Fuentio Answer Carries Its Source, Date and Proof Code: https://fuentio.com/blog/source-date-proof-code-every-answer/ — How Fuentio backs each answer: source and check date on every fact, receipts, proof codes, what happens when official sources disagree, and honest limits.
- Fuentio Is Live: Official France and Spain Company Data for AI Agents: https://fuentio.com/blog/fuentio-is-live-company-data-ai-agents/ — Fuentio's MCP server and REST API went live on 11 October 2026: official French and Spanish company data, 17 tools (18 since 16 October), sources, check dates.
- How to Check a French Supplier in Two Minutes, with Official Sources: https://fuentio.com/blog/check-french-supplier-official-sources/ — Check a French supplier from its SIREN: status in the official register, insolvency notices in the BODACC, and a proof code for your file, with real answers.
- Check French and Spanish Companies Inside Claude: https://fuentio.com/blog/check-french-spanish-companies-in-claude/ — Add Fuentio to Claude as a custom connector, or to Claude Code in one command, then ask about French and Spanish companies: answers with sources and dates.
- How to Find Out Who Runs a Spanish Company (and Whether They Can Sign): https://fuentio.com/blog/who-runs-a-spanish-company-administrator/ — How to find who manages a Spanish company and whether they can sign: the four kinds of board, BORME appointments, the registry note and attorneys.
- How to Find Out Who Runs a French Company (and Who Can Sign for It): https://fuentio.com/blog/who-runs-a-french-company-officers/ — How to find the officers of a French company and who can sign for it: président of an SAS, gérant of a SARL, the RNE, the State directory and the BODACC.
- The French RCS Number: What It Is, Its Format and Where to Find It: https://fuentio.com/blog/rcs-number-france-format-where-to-find/ — What a French RCS number is, how it's written (RCS, city, SIREN), who has one, where companies must show it, and how it relates to the SIREN and the RNE.
- Provenance on Every Answer: How Fuentio Shows the Source, Licence and Check Time of Company Data: https://fuentio.com/blog/provenance-company-data-source-licence-check-date/ — Company data provenance: every Fuentio answer gives its official source, licence, source update date and check time. What each field means and how to file it.
- Personal Data in Company Records: What Fuentio Keeps, What It Drops, and Why: https://fuentio.com/blog/personal-data-company-records-what-we-keep/ — Personal data in company records: Fuentio's answers name no person. What we store about officers in France and Spain, what we drop, how removals work.
- KYB API for French and Spanish Businesses: What the Registry Step Gives You: https://fuentio.com/blog/kyb-api-france-spain-registry-data/ — KYB API for French and Spanish businesses: what the registry step can confirm, what it can't, and how to file each check so it holds up in an audit.
- How to Tell Whether a Spanish Company Is Still Active (Five Official Signals): https://fuentio.com/blog/is-spanish-company-still-active/ — Five official sources that tell you whether a Spanish company is still active: BORME acts, "en liquidación", insolvency, a revoked NIF, the registry note.
- Methodology: How Fuentio Turns the BORME Into Company Records (and How We Check It): https://fuentio.com/blog/how-fuentio-turns-borme-into-company-records/ — Our methodology for Spain's BORME: daily ingestion, parsing, registry-sheet IDs, status rules, held days, privacy scrubbing and a 20/20 official spot check.
- Methodology: How Fuentio Reads French Company Data, Field by Field: https://fuentio.com/blog/how-fuentio-reads-french-company-data/ — Our methodology for French company data: how Sirene and RNE fields are mapped, status rules, VAT handling, what we never infer, and how answers stay traceable.
- How Fuentio Identifies a Company: Identifiers First, Names Never Decide: https://fuentio.com/blog/how-fuentio-identifies-a-company-identifiers-first/ — How Fuentio identifies a company in France and Spain: checked identifiers, exact-match lookups, candidate lists for name searches, and no guessing.
- Mandatory Mentions on a French B2B Invoice (SIREN, VAT Number and the 2026 Additions): https://fuentio.com/blog/french-invoice-mandatory-mentions-siren-vat/ — What a French invoice between businesses must show: identities, SIREN, VAT numbers, dates, amounts, and the mentions added by the e-invoicing reform.
- Your French Customer or Supplier Is "Radiée" or "Cessée": What It Means and What to Do: https://fuentio.com/blog/french-company-struck-off-radiee-what-to-do/ — What "radiée" and "cessée" mean for a French company, where each appears, how collective proceedings fit in, and what creditors and customers should do next.
- How to Find a French Company's SIRET or SIREN Number (Free, Official Sources): https://fuentio.com/blog/find-siret-siren-of-a-french-company/ — Find a French company's SIRET or SIREN for free: on its documents, in the official directory and INSEE's Sirene register, from its VAT number, site by site.
- Company Verification API for France and Spain: Official Register Data in One Format: https://fuentio.com/blog/company-verification-api-france-spain/ — Company verification API for France and Spain: official register data in one format, checked identifiers, source and check date on every answer. Price inside.
- Normalising Company Data Without Losing the Original: Legal Forms, Activity Codes and Statuses: https://fuentio.com/blog/company-data-normalisation-elf-nace-original-wording/ — How Fuentio maps French and Spanish legal forms to ISO 20275 ELF codes, NAF to NACE and ISIC, and statuses to one list, while keeping the register's own words.
- Company Data API Pricing Explained: What a Unit Is, What Costs Nothing, and Which Plan Fits: https://fuentio.com/blog/company-data-api-pricing-units-explained/ — Company data API pricing explained: what a unit is, which calls are free, what happens at your limit, and how to size a Fuentio plan from your volume.
- How to Check a Spanish Company's NIF (CIF): Format, Official Checks and Limits: https://fuentio.com/blog/check-spanish-nif-cif-company/ — How a Spanish company's NIF is built, how to check it with the Agencia Tributaria and VIES, why the BORME doesn't show it, and how to tie it to a company.
- How to Check a French Freelancer (Micro-Entrepreneur) Before You Hire Them: https://fuentio.com/blog/check-french-freelancer-micro-entrepreneur/ — How to check a French micro-entrepreneur before you hire them: SIREN, status, activity, registration proof and the Urssaf vigilance certificate for €5,000+.
- How to Check a List of SIREN Numbers in Bulk (CSV + Python, Free Official API): https://fuentio.com/blog/bulk-check-siren-list-csv-python/ — A tested Python script that checks a CSV of SIREN numbers against the State's free API: check digit, status, closing date and check time, within the rate limit.
- Build or Buy? Running Your Own French and Spanish Company Data Pipeline vs Using an API: https://fuentio.com/blog/build-vs-buy-french-spanish-company-data/ — Build or buy French and Spanish company data? What a Sirene and BORME pipeline really takes: rate limits, parsing, privacy, quality, and when an API wins.
- Keeping an Eye on French Suppliers: Spotting a Cessation or Collective Proceedings in Time: https://fuentio.com/blog/watch-french-suppliers-cessation-proceedings/ — How to follow your French suppliers in official sources: Sirene status, BODACC collective proceedings, which signals matter and how often to check.
- Customer Risk in Spain: Which BORME Acts to Watch: https://fuentio.com/blog/spain-customer-risk-borme-acts-to-watch/ — The BORME acts that matter for a Spanish customer or supplier: dissolution, extinction, insolvency, officer changes and moves, and what to do about each.
- What Does Non-Diffusible Mean in France? Sirene's Partial Diffusion Explained: https://fuentio.com/blog/non-diffusible-companies-france-why-missing/ — What non-diffusible means for a French company in the Sirene database: partial diffusion, what's hidden for sole traders, why searches miss them, how to check.
- Free SIREN APIs: The Official Options for Checking French Companies: https://fuentio.com/blog/free-siren-api-official-options/ — The State's free APIs for French company data: Recherche d'entreprises (no key, 7 requests a second) and INSEE's Sirene API (free key), with their limits.
- How to Connect an AI Agent to French and Spanish Company Registers With MCP: https://fuentio.com/blog/connect-ai-agent-french-spanish-registers-mcp/ — How to give Claude, Cursor or any MCP client access to official French and Spanish company records, which tools to expose, and how to test the answers.
- How to Clean and Enrich Your CRM With Official Company Registers: https://fuentio.com/blog/clean-crm-with-official-company-registers/ — A practical method to clean B2B accounts in your CRM with official registers: match on numbers, flag ceased companies, merge duplicates and date each fact.
- How to Check a Spanish Company Before You Sign (Even Without Its NIF): https://fuentio.com/blog/check-spanish-company-before-signing/ — How to check a Spanish company before signing: exact name, registry sheet, recent BORME acts, officers, insolvency and the registry's information note.
- How to Check an EU VAT Number With VIES, and Why You Should Check the SIREN Too: https://fuentio.com/blog/check-eu-vat-number-vies-and-siren/ — What VIES confirms about a VAT number and what it doesn't, real answers for French and Spanish numbers, its errors, and why a register check completes it.
- How to Check a French Company Before You Sign a Contract: https://fuentio.com/blog/check-company-before-signing-contract-france/ — Seven checks to run on a French company before you sign: identity, status, legal form, signatory, proceedings and the €5,000 vigilance duty, with sources.
- The BORME API: Using Spain's Registered Company Acts in Your App: https://fuentio.com/blog/borme-api-registro-mercantil-acts-in-your-app/ — How the BOE's open-data API serves the daily BORME summary, what each item links to, and the work left to turn registered acts into company records.
- Why AI Agents Get Company Data Wrong (and How Source + Date Fixes It): https://fuentio.com/blog/why-ai-agents-get-company-data-wrong/ — Three ways AI agents get company facts wrong (stale status, wrong entity, invented numbers), with real reproducible examples, and the fix for each one.
- What Is MCP and Why AI Agents Need It (Model Context Protocol): https://fuentio.com/blog/what-is-mcp-model-context-protocol/ — The Model Context Protocol in plain words: hosts, clients and servers, tools and transports, why agents need a sourced answer, and what MCP doesn't do for you.
- What Is KYB and Why Does It Matter? (Complete Guide for 2026): https://fuentio.com/blog/what-is-kyb/ — KYB (know your business) explained: what checking a business customer means, where official registers help, what they can't show, and why you decide.
- How Marketplaces Can Check Business Sellers Against Official Registers: https://fuentio.com/blog/verify-marketplace-sellers-business-registers/ — How a marketplace can check business sellers at sign-up against official registers: what to ask, what to compare, what a register can't say, and what to keep.
- How to Verify a French Company (SIREN/SIRET) via API in 2026: https://fuentio.com/blog/verify-french-company-siren-siret-api/ — A step-by-step tutorial: check a SIREN's digits, look a French company up by SIREN, SIRET or VAT number, search by name, read the source and handle every error.
- Spanish BORME Explained: Spain's Mercantile Register Gazette and How to Use It: https://fuentio.com/blog/spanish-borme-explained/ — What Spain's BORME is, how it relates to the mercantile register, how to search a Spanish company, read an entry and its sheet, and why it shows no CIF.
- S.L. vs S.A.: Company Forms in Spain and What the BORME Publishes for Each: https://fuentio.com/blog/spain-sl-vs-sa-company-forms-borme/ — The key differences between the Spanish S.L. and S.A., how to spot each in a company name, and what the BORME publishes for each, with real examples.
- E-Invoicing in Spain (Crea y Crece and Verifactu): Which Company Data You Need: https://fuentio.com/blog/spain-e-invoicing-verifactu-company-data/ — The official calendar for Verifactu and Spain's B2B e-invoicing, which customer data an e-invoice needs, and what the company register can and can't give you.
- SIREN, SIRET and French VAT Numbers: Formats, Check Digits and How to Validate Them (with Code): https://fuentio.com/blog/siren-siret-vat-number-formats-validation/ — SIREN, SIRET and French VAT number formats, how their check digits work, offline validation code in Python and JavaScript, and how to confirm the company.
- Register Checks Before Investing: A Due Diligence Checklist for Investors: https://fuentio.com/blog/register-checks-before-investing/ — A checklist for investors: what an official company register can confirm before you invest, from the right entity to recent changes, and what it leaves out.
- Kbis, INSEE Status Notice, RNE Extract: Which Document Proves a French Company Exists?: https://fuentio.com/blog/kbis-sirene-notice-rne-proof-company-exists/ — Where the Kbis, the Sirene status notice and the RNE proof come from, what they cost, when each is accepted, and where register data fits in your checks.
- How to Read the BORME: Registered Acts Explained (Incorporation, Appointments, Removals, Dissolution…): https://fuentio.com/blog/how-to-read-borme-registered-acts/ — A glossary of the acts Spain's BORME publishes, from incorporation to extinction, each with a real example, and how to read an entry's dates and references.
- SAS, SARL, SASU, EI: French Company Legal Forms Explained: https://fuentio.com/blog/french-legal-forms-sas-sarl-sasu-ei/ — The most common French legal forms, their rules on partners and capital, what they mean for liability, and how a company's form appears in register data.
- French Company Registers Explained: INSEE, RNE, Sirene: https://fuentio.com/blog/french-company-registers-insee-rne-sirene/ — How France's official company registers fit together: Sirene from INSEE, the RNE from INPI, SIREN and SIRET numbers, what you can reuse and the limits.
- E-Invoicing in France 2026: Why Your Customers' SIREN Must Be Right: https://fuentio.com/blog/france-e-invoicing-2026-customer-siren/ — The official French e-invoicing calendar, why the customer's SIREN becomes a mandatory invoice field, and how to check the SIRENs in your customer file.
- 5 Use Cases for Company Verification APIs (Beyond KYB): https://fuentio.com/blog/company-verification-use-cases-beyond-kyb/ — Five everyday uses for checking companies against official registers beyond KYB: suppliers, clean CRM records, invoices, marketplace sellers and AI agents.
- Company Verification in Europe: How Registers Differ (2026): https://fuentio.com/blog/company-verification-europe-how-registers-differ/ — Europe's official company registers differ in who publishes them, what they hold, how often they change, how you access them and what their licence allows.
- Company Data APIs in 2026: What to Check Before You Choose: https://fuentio.com/blog/company-data-apis-what-to-check/ — A buyer's checklist for company data APIs: source on every answer, licence, freshness, honest coverage, agent support and public pricing, with tests to run.
- How Company Checks Support Anti-Money-Laundering (AML) Reviews: https://fuentio.com/blog/company-checks-aml-reviews/ — Where official company register checks fit in an anti-money-laundering review: what they confirm at onboarding and later, and what they can't do on their own.
- Companies House Search: How to Use company-information.service.gov.uk to Check a UK Company: https://fuentio.com/blog/check-uk-company-companies-house/ — How to use company-information.service.gov.uk, Companies House's free search: find a UK company by name or number and read its status, filings and charges.
- How to Check Whether a French Company Is Still Active (Ceased or Not): https://fuentio.com/blog/check-french-company-still-active-or-ceased/ — Company statuses in France's Sirene and RNE, what "ceased" means, why a closed establishment isn't a ceased company, and how to check by hand or through an API.
- Fintech Merchant Onboarding: Automating the Company Register Step: https://fuentio.com/blog/automate-merchant-onboarding-register-check/ — How payment and fintech teams can automate the company register step of merchant onboarding: what to match, when to send a case to a person, and what to keep.
- The French APE / NAF Code: What It's For and How to Find It for a Company: https://fuentio.com/blog/ape-naf-code-france-explained/ — What the French APE code is, how to read a NAF code from broad to precise, how to find any company's code, and what NAF 2025 changes on 1 January 2027.
- How AI Startups Can Give Their Agents Reliable Company Data: https://fuentio.com/blog/ai-agents-reliable-company-data/ — How to give an AI agent company facts it can stand behind: official sources, a plain answer with its source, an honest unknown, and a design that fails safely.

## Guides

- How to verify a French company (SIREN/SIRET) with an API: https://fuentio.com/guides/verify-french-company/
- Spanish BORME explained: how to check company changes programmatically: https://fuentio.com/guides/spanish-borme-company-changes/

## Contact

hello@fuentio.com · https://fuentio.com/join/