EU Compliance & On-Chain Pre-flight

Sanctions screening (EU/UN/UK), VAT ID and IBAN validation, counterparty due diligence, EU VAT treatment with EN 16931 codes, e-invoice validation, and transaction pre-flight with decoded revert reasons. Remote MCP server, no install, pay per call or use the free tools.

GitHub

Documentation

EU compliance & on-chain pre-flight tools for AI agents

Pay per call in USDC. No account, no API key, no subscription, no minimum. Also an MCP server, so an agent can simply use the tools.

An agent calls an endpoint, gets HTTP 402 Payment Required with the exact price, pays a fraction of a cent in USDC on Base, repeats the call and gets the answer. Every answer carries a signed receipt that verifies offline.

Catalog: https://eucompliance.tools · /.well-known/x402 · /llms.txt

Add it to your agent (30 seconds)

Claude Code

claude mcp add --transport http eucompliance https://mcp.eucompliance.tools/mcp

Claude Desktop / Cursor / any MCP client — add to the config:

{
  "mcpServers": {
    "eucompliance": {
      "type": "http",
      "url": "https://mcp.eucompliance.tools/mcp"
    }
  }
}

Nothing to sign up for. Two tools are free (VAT ID and IBAN validation, 5000/day); the rest are paid per call and an agent with a wallet settles them over x402 by itself. Ask it "validate VAT ID ATU16170006" and it works immediately.

What the tools answer

On-chain pre-flight — for agents that transact

Tool	What it answers	Price
Transaction pre-flight	Will this transaction go through? Gas vs. balance, full simulation with the revert reason decoded into plain text, stuck pending nonces, contract-or-wallet recipient, ERC-20 allowance, and a sanctions screen of the counterparty. One call, `send` / `do not send` with every blocking reason	$0.005
Token allowance & balance	Enough allowance and balance for this amount? Live from the chain on Base, Ethereum, Arbitrum, Optimism and Polygon	$0.002
Transaction status	What happened to my transaction — and if it failed, why, recovered by replaying the call against its block. The receipt alone does not carry that reason	$0.002

A failed transaction costs the full gas of the attempt. These calls cost a fraction of it.

EU compliance — for agents that onboard, invoice or pay

Tool	What it answers	Price
Counterparty check (KYB)	VAT ID + sanctions + IBAN + GLEIF LEI in one call → traffic light `clear / review / blocked` with reasons	$0.02
E-invoice validation	EN 16931 / XRechnung / ZUGFeRD / Factur-X / Peppol BIS: mandatory fields, totals arithmetic, VAT category rules — each finding with its official `BR-` code	$0.02
EU VAT rules engine	Place of supply, reverse charge, intra-Community supply, OSS threshold, with EN 16931 codes (`BT-151` category, `BT-121` exemption reason)	$0.005
Sanctions screening	EU (Commission FSF) + UN Security Council + UK (HM Treasury OFSI) in one call, re-indexed daily, every hit auditable with list, reference and generation date	$0.01
Company register lookup	Official national registers: FR, NO, CZ, FI, SK, PL — normalised	$0.01
Agent spend bookkeeping	What did my agent spend, in EUR at the ECB rate of the payment date, with VAT treatment and CSV export	$0.10
VAT ID / IBAN validation	Format plus live VIES registration check; IBAN mod-97 with bank identification	free via MCP

General purpose

Tool	What it answers	Price
Chat completion	A model answer per call, no account and no API key. 8k chars in, 1k tokens out	$0.005
Chat completion (plus)	Stronger model, 16k chars in, 2k tokens out	$0.02
Web page reader	URL in, readable content out as clean markdown or text — direct fetch of the page, no third-party index in between	$0.005

Try it without paying anything

Free, 5 calls a day per address, no signup:

curl "https://api.eucompliance.tools/free/vat-rules?supplier=AT&customer=DE&b2b=true&type=service"
curl "https://api.eucompliance.tools/free/sanctions?name=Some%20Company%20Ltd"

Or get a key with 100 free calls covering every tool at https://api.eucompliance.tools/kaufen — email in, key out, no card.

Verify any answer without trusting us

Every response carries a receipt: the result hash, the issue time and an EIP-191 signature. Checking it needs no network and no trust in the issuer:

pip install eucompliance-verify

from eucompliance_verify import verify_receipt, PaymentPolicy

result = verify_receipt(response_json)          # recomputes the hash, recovers the signer
policy = PaymentPolicy(max_age_hours=24)
if not policy.check(response_json).allowed:
    raise RuntimeError("do not release this payment")

Source: eucompliance-verify (MIT). Conformance fixtures for the VAT engine, public domain: eu-vat-conformance.

Paying

x402 v2, scheme exact, network eip155:8453 (Base mainnet), asset USDC. The payer needs no ETH — gas is sponsored via EIP-3009, with Coinbase CDP as facilitator. Call any endpoint without payment to receive the challenge containing the exact price and payment address.

Prefer an invoice? The operator holds an Austrian trade licence and a VAT ID and can bill normally — see the signup page.

Who runs this

eucompliance.tools, operated from Vienna, Austria.

Two things about the origin, because they explain why the tools are shaped the way they are:

The VAT engine was not built for a market — it was built because we issue reverse-charge invoices ourselves every week and nothing off the shelf produced the codes our accountant, and from 2026 the EU e-invoicing mandates, require. Every rule in it is one we file under. The conformance fixtures are public so you can check that claim rather than believe it.

The on-chain tooling came out of running an agent wallet and getting tired of transactions that failed for reasons the receipt did not explain. The pre-flight check is the thing we wanted to exist.

Operator: Patrick Kaufmann, sole proprietor in Vienna, Austria (trade licence, Austrian VAT ID) — which is why an ordinary invoice is an option alongside per-call USDC. On-chain identity: ERC-8004 agent #60255 on Base.

MIT licensed. No telemetry, no tracking, no key required to look.