Roundhouse AI

vat-validate.hergertsynthora.com

Holding tecnológico especializado en mallas agénticas, automatizaciones LLM y software a medida. Las Palmas de Gran Canaria, Canarias.

OtherLiveeip155:8453Exactvia cdp
https://vat-validate.hergertsynthora.com/service
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
$0.02
Verified settled volume
6 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-07-09 09:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x4a3129235a83d65e5f4a4ff2818e3cf087df1377

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x4a3129235a83d65e5f4a4ff2818e3cf087df1377",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://vat-validate.hergertsynthora.com/service",
      "description": "EU VAT number validation for agents: per-country format rules and check-digit algorithms (DE, ES, FR, IT, NL, PT, BE, AT, PL, SE...) executed offline — deterministic, no VIES dependency, instant JSON verdict with country and normalized number. $0.001 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.",
      "maxAmountRequired": "1000",
      "maxTimeoutSeconds": 300
    }
  ],
  "freeTier": {
    "note": "send header X-WALLET: 0x<your Base address> for a free trial",
    "header": "X-WALLET",
    "callsPerWallet": 3
  },
  "resource": {
    "url": "https://vat-validate.hergertsynthora.com/service",
    "mimeType": "application/json",
    "description": "EU VAT number validation for agents: per-country format rules and check-digit algorithms (DE, ES, FR, IT, NL, PT, BE, AT, PL, SE...) executed offline — deterministic, no VIES dependency, instant JSON verdict with country and normalized number. $0.001 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "vat": "DE811907980"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": true,
            "niche": "vat-validate",
            "result": {
              "valid": true,
              "country": "DE",
              "normalized": "DE811907980",
              "checkdigit_ok": true
            },
            "provenance": {
              "url": "algorithmic:eu-vat-checkdigits",
              "source": "EU VAT Number Validator"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "vat"
                ],
                "properties": {
                  "vat": {
                    "type": "string",
                    "description": "vat"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "ok": {
                  "type": "boolean"
                },
                "type": "object",
                "niche": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0x4a31…f1377. The signed payment is good for 5 minutes.

Paid to
0x4a31…f1377
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
1000 smallest units
Buys
EU VAT number validation for agents: per-country format rules and check-digit algorithms (DE, ES, FR, IT, NL, PT, BE, AT, PL, SE...) executed offline — deterministic, no VIES dependency, instant JSON verdict with country and normalized number. $0.001 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x4a3129235a83d65e5f4a4ff2818e3cf087df1377",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://vat-validate.hergertsynthora.com/service",
    "description": "EU VAT number validation for agents: per-country format rules and check-digit algorithms (DE, ES, FR, IT, NL, PT, BE, AT, PL, SE...) executed offline — deterministic, no VIES dependency, instant JSON verdict with country and normalized number. $0.001 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.",
    "maxAmountRequired": "1000",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "vat": "DE811907980"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "ok": true,
          "niche": "vat-validate",
          "result": {
            "valid": true,
            "country": "DE",
            "normalized": "DE811907980",
            "checkdigit_ok": true
          },
          "provenance": {
            "url": "algorithmic:eu-vat-checkdigits",
            "source": "EU VAT Number Validator"
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "vat"
              ],
              "properties": {
                "vat": {
                  "type": "string",
                  "description": "vat"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "ok": {
                "type": "boolean"
              },
              "type": "object",
              "niche": {
                "type": "string"
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-07-09 09:32Z
Last indexed by Roundhouse
2026-07-25 00:00Z
Last enriched (probe, favicon, geo)
2026-09-14 17:46Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 410
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service vat-validate.hergertsynthora.com and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=vat-validate.hergertsynthora.com'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://vat-validate.hergertsynthora.com/service, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.