Integration

W System integration

W System is an EU business-data and e-invoicing API. Validate EU VAT numbers in VIES (with a consultation number as audit proof, and a flagged national-register fallback when a member state is down) and EORI numbers in the EC EOS service, look up companies in official registers (France, Norway, Finland, Czechia, Poland, Estonia, GLEIF LEI elsewhere), screen names against the EU, UN, OFAC SDN and UK sanctions lists, run a one-call KYB verdict or a due-diligence report, and validate, read or create EN 16931 and XRechnung e-invoices and check whether a company can receive them over Peppol. Not exposed: the sandbox e-invoice send and its evidence key, the Peppol mandate routes (they record a signer's legal acceptance), plan checkout, the health check and the vendor's internal send-usage counter. Authentication is an API key in the X-API-Key header: a free key (500 units a month, no card) from api.wsystem.dev/account/free-key, or a Starter or Pro monthly plan key. Most calls cost 1 unit; KYB 5, e-invoice validation 3, e-invoice creation 8 and the due-diligence report 50, and a call needing more units than are left is refused with HTTP 429.

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When this happens, do that in W System.Built from the 19 W System tools below, on the connection you add once.

What you can do with W System

Each of these is one operation on one endpoint, available both as a workflow step and as a tool an AI agent can call on its own. Nothing bundles several operations into one action, so what a run did stays readable afterwards.

Each badge shows the default agent permission of an endpoint (allowed: an agent calls it without asking; ask first: you are asked before an agent calls it, when the agent or chat asks permission for sensitive actions; never: no agent may call it), which every user can change endpoint by endpoint in their credential settings.

Most endpoints run on the free plan. A few, mainly the ones that publish on your behalf, need a paid plan.

Einvoice, 3 operations

create_einvoiceCreate einvoicePOSTAgents: ask firstCreates an EN 16931, XRechnung or Peppol BIS 3 UBL 2.1 invoice from JSON: totals and VAT breakdown are computed, and the result is validated before it is returned (valid, errors, xml). Nothing is sent. 8 units.
parse_einvoiceParse einvoicePOSTAgents: ask firstReads an incoming EU e-invoice (UBL, CII or a ZUGFeRD/Factur-X PDF) into one JSON shape: number, dates, seller and buyer, totals, VAT breakdown, payment (IBAN), lines. Does not check validity; use validate_einvoice.
validate_einvoiceValidate einvoicePOSTAgents: ask firstValidates an EU e-invoice (UBL, CII or a ZUGFeRD/Factur-X PDF) against the XML schema, the CEN EN 16931 rules and, for XRechnung, the KoSIT rules. Returns valid and each error with rule id, message, XPath and fix hint. 3 units.

Company, 2 operations

search_companiesSearch companiesGETAgents: ask firstSearches official business registers by company name or registry number: FR, NO, FI, CZ, PL (KRS number only) and EE directly, any other country through GLEIF LEI records. Returns legal name, registry id, status, address, VAT id.
search_companies_batchSearch companies batchPOSTAgents: ask firstSearches official business registers for up to 25 companies in one call; each query takes the name or number and country that search_companies takes.

Eori number, 2 operations

verify_eoriVerify eoriGETAgents: ask firstValidates one EU EORI (customs) number in the European Commission EOS service. Returns valid, status and the trader's name and address when the trader consented to publication.
verify_eori_batchVerify eori batchPOSTAgents: ask firstValidates up to 100 EU EORI numbers in the EC EOS service in one call; each result has the same fields as verify_eori.

Sanctions screening, 2 operations

screen_sanctionsScreen sanctionsGETAgents: ask firstScreens a person or company name against the EU consolidated, UN Security Council, US OFAC SDN and UK sanctions lists (refreshed daily) with fuzzy, transliteration-aware matching. A potential match needs human review.
screen_sanctions_batchScreen sanctions batchPOSTAgents: ask firstScreens up to 50 names against the EU, UN, OFAC SDN and UK sanctions lists in one call; each result has the same fields as screen_sanctions. Potential matches need human review.

Vat number, 2 operations

verify_vatVerify vatGETAgents: ask firstValidates one EU VAT number (country prefix included) in VIES and returns status, validity, the registered name and address where disclosed and a consultation number as audit proof.
verify_vat_batchVerify vat batchPOSTAgents: ask firstValidates up to 100 EU VAT numbers in VIES in one call and returns how many are valid plus one verify_vat-shaped result per number, in the order sent.

Approved platform, 1 operation

check_fr_approved_platformCheck fr approved platformGETAgents: ask firstChecks whether a platform is on France's official DGFiP lists of approved e-invoicing platforms (Plateformes Agreees) or awaiting interoperability tests, by name or website. Free; an unofficial copy.

Due diligence report, 1 operation

create_due_diligence_reportCreate due diligence reportPOSTAgents: ask firstBuilds a counterparty due-diligence report in one call (VAT, register, sanctions, EORI, GLEIF LEI and Peppol route) with risk flags, a 0-100 risk score, a pass/review/fail verdict, sources and a UTC timestamp. 50 units.

Einvoice route, 1 operation

get_einvoice_routeGet einvoice routeGETAgents: ask firstAnswers "can I e-invoice this company?": the VIES result for its VAT number, whether it is on Peppol (and accepts BIS 3 invoices), its country's B2B e-invoicing mandate and the format to pass to create_einvoice.

Einvoice sample, 1 operation

get_einvoice_sampleGet einvoice sampleGETAgents: ask firstReturns a complete example request body for create_einvoice (an XRechnung with seller, buyer, two lines and payment), to copy and adapt. Free.

Kyb check, 1 operation

run_kyb_checkRun kyb checkPOSTAgents: ask firstRuns a know-your-business check on an EU company in one call: VIES VAT validation, official register lookup and EU/UN/OFAC/UK sanctions screening, combined into a pass, review or fail verdict with reasons. 5 units.

Plan, 1 operation

list_plansList plansGETAgents: ask firstLists W System's monthly API-key plans with price, units included, the units each route costs and the free-key offer. Free.

Usage, 1 operation

get_usageGet usageGETAgents: ask firstReturns the connected API key's plan, its monthly unit quota and the units used and left this month (UTC). Free; uses no units.

Vies status, 1 operation

get_vies_statusGet vies statusGETAgents: ask firstReturns VIES availability per EU member state, read from the European Commission and cached 5 minutes, and whether W System has a national fallback for each. Free; uses no quota.

Use W System from Claude Code, Cursor or Codex

Connect W System in LiveContext, create an API key in Settings, then add the LiveContext MCP server to your client. Its W System operations become tools the client can call, next to every other integration you connected.

Claude Code

claude mcp add --transport http livecontext https://livecontext.ai/mcp --header "X-API-Key: YOUR_API_KEY"

Codex (~/.codex/config.toml)

[mcp_servers.livecontext]
url = "https://livecontext.ai/mcp"

[mcp_servers.livecontext.http_headers]
"X-API-Key" = "YOUR_API_KEY"

Cursor, Claude Desktop and other JSON configs

{
  "mcpServers": {
    "livecontext": {
      "type": "http",
      "url": "https://livecontext.ai/mcp",
      "headers": {
        "X-API-Key": "YOUR_API_KEY"
      }
    }
  }
}

Set up the MCP server step by step

How to connect W System

Create your workspace
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Connect W System once
Add your W System connection in Settings. Every tool from this integration reuses it, and secrets are encrypted at rest and visible only to you.
Describe the job in chat
The workflow builds itself in front of you and picks the endpoints it needs. Drag the steps yourself on the canvas whenever you would rather be explicit.