Czech Unreliable VAT Payer Check

Check a Czech VAT number's unreliable-payer flag and published bank accounts in the Ministry of Finance records.

Pay by wallet (x402) cz-unreliable-vat-payer

Example

Example answer

{
  "dic": "00177041",
  "input_dic": "00177041",
  "published_accounts": [
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "DE67269410530689050300"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "GB86MIDL40025051315439"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "DE02502109001215824019"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "PL32103015080000000815365003"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "NO0460050583913"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "SE1230000000031441710744"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-04-01",
      "account_number": "DE30514107004058012218"
    },
    {
      "bank_code": "2700",
      "is_standard": true,
      "published_at": "2013-04-05",
      "account_number": "2101983244"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2013-12-20",
      "account_number": "CH0508836120399100006"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2015-06-18",
      "account_number": "DE88269410530689050310"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2019-02-08",
      "account_number": "0101968892"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2019-03-21",
      "account_number": "DE20512106004270708318"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2020-03-14",
      "account_number": "6161403594"
    },
    {
      "bank_code": null,
      "is_standard": false,
      "published_at": "2020-07-08",
      "account_number": "BE90001833662132"
    },
    {
      "bank_code": "2700",
      "is_standard": true,
      "published_at": "2020-07-08",
      "account_number": "1387698195"
    },
    {
      "bank_code": "2700",
      "is_standard": true,
      "published_at": "2026-03-19",
      "account_number": "1000053254"
    }
  ],
  "is_unreliable_payer": false,
  "joint_liability_risk": "LOW: Payer is reliable. Pay only to one of the published accounts to avoid §109 joint liability.",
  "financial_office_code": "13",
  "response_generated_at": "2026-04-30",
  "is_registered_vat_payer": true,
  "published_account_count": 16
}

Inputs

Field	Type	Required	What it is
`dic`	string	Yes	Czech DIČ (CZ + 8-10 digits) or bare IČO (8 digits)

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`dic`	string	Always (present in every successful answer)
`input_dic`	string	Always (present in every successful answer)
`published_accounts`	array	Always (present in every successful answer)
`is_unreliable_payer`	boolean	Always (present in every successful answer)
`joint_liability_risk`	string	Always (present in every successful answer)
`financial_office_code`	string	Always (present in every successful answer)
`response_generated_at`	string	Always (present in every successful answer)
`is_registered_vat_payer`	boolean	Always (present in every successful answer)
`published_account_count`	integer	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "cz-unreliable-vat-payer",
    "inputs": {
      "dic": "CZ00177041"
    },
    "max_price_cents": 5
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "cz-unreliable-vat-payer",
    "inputs": {
      "dic": "CZ00177041"
    },
    "max_price_cents": 5
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "cz-unreliable-vat-payer",
  inputs: {
    "dic": "CZ00177041"
  },
  max_price_cents: 5,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="cz-unreliable-vat-payer",
    inputs={
        "dic": "CZ00177041",
    },
    max_price_cents=5,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i -X POST https://api.strale.io/x402/v2/cz-unreliable-vat-payer \
  -H 'Content-Type: application/json' \
  -d '{
    "dic": "CZ00177041"
  }'

Limitations

DIČ must be syntactically valid — does not resolve IČO→DIČ automatically
Input is treated as DIČ (with or without CZ prefix). Natural-person DIČs may be 9-10 digits (based on rodné číslo) and are not derivable from IČO alone.
What to do instead: For legal entities, use the 8-digit IČO; the service accepts bare digits.
Not a liveness check on the bank account
Published accounts are what the VAT payer registered with MF ČR. The service does not confirm the account is currently open or held by the named bank.
Status snapshot only — history not returned
The check returns the current unreliable-payer flag as of the response_generated_at date. Historical changes (when the flag was set/cleared) are not exposed.