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Aether Layer: EU VAT number validation (VIES)

R1· needs a key

Validates EU VAT numbers: local format/checksum for 27 states + XI, then VIES (cached 24 h).

v0.3.1 · active · website · descriptor JSON · versions

An agent can connect on its own if it already holds X_API_KEY, X_API_KEY.Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.
Quality85new
Trust83of 100
Uptime, 30 days100%
Latency p50420 ms

Connect

8 clients · secrets stay placeholders
{
  "mcpServers": {
    "eu-vat-validate": {
      "type": "http",
      "url": "https://aether-layer.com/api/mcp?src=mcpreg",
      "headers": {
        "X-Api-Key": "${X_API_KEY}",
        "Authorization": "${X_API_KEY}"
      }
    }
  }
}
claude mcp add --transport http eu-vat-validate https://aether-layer.com/api/mcp?src=mcpreg --header "X-Api-Key: ${X_API_KEY}" --header "Authorization: ${X_API_KEY}"
[mcp_servers.eu-vat-validate]
url = "https://aether-layer.com/api/mcp?src=mcpreg"
env_http_headers = { "X-Api-Key" = "X_API_KEY", "Authorization" = "X_API_KEY" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "eu-vat-validate": {
      "type": "remote",
      "url": "https://aether-layer.com/api/mcp?src=mcpreg",
      "enabled": true,
      "headers": {
        "X-Api-Key": "{env:X_API_KEY}",
        "Authorization": "{env:X_API_KEY}"
      }
    }
  }
}
{
  "mcpServers": {
    "eu-vat-validate": {
      "type": "http",
      "url": "https://aether-layer.com/api/mcp?src=mcpreg",
      "headers": {
        "X-Api-Key": "${X_API_KEY}",
        "Authorization": "${X_API_KEY}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=eu-vat-validate&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vYWV0aGVyLWxheWVyLmNvbS9hcGkvbWNwP3NyYz1tY3ByZWciLCJoZWFkZXJzIjp7IlgtQXBpLUtleSI6IiR7WF9BUElfS0VZfSIsIkF1dGhvcml6YXRpb24iOiIke1hfQVBJX0tFWX0ifX0%3D"
}
{
  "servers": {
    "eu-vat-validate": {
      "type": "http",
      "url": "https://aether-layer.com/api/mcp?src=mcpreg",
      "headers": {
        "X-Api-Key": "${X_API_KEY}",
        "Authorization": "${X_API_KEY}"
      }
    }
  }
}
{
  "mcpServers": {
    "eu-vat-validate": {
      "httpUrl": "https://aether-layer.com/api/mcp?src=mcpreg",
      "headers": {
        "X-Api-Key": "${X_API_KEY}",
        "Authorization": "${X_API_KEY}"
      }
    }
  }
}
extensions:
  "eu-vat-validate":
    enabled: true
    name: "eu-vat-validate"
    type: streamable_http
    uri: "https://aether-layer.com/api/mcp?src=mcpreg"
    headers:
      "X-Api-Key": "${X_API_KEY}"
      "Authorization": "${X_API_KEY}"
    timeout: 300

Placeholders to fill from your own secret store: ${X_API_KEY}, ${X_API_KEY}. The registry never accepts secret values.

Quality 85 / 100new

protocol75 · weight 25
  • warn
    protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
  • n/a
    protocol.statelessonly applies to 2026-07-28 servers
  • pass
    protocol.transportstreamable HTTP
  • n/a
    protocol.list_ttlonly applies to 2026-07-28 servers
authorizationn/a · weight 15
  • n/a
    auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
  • n/a
    auth.secret_in_urlno templated URL
tool hygiene94 · weight 30
  • pass
    tools.descriptionsevery tool has a description
  • warn
    tools.description_length1 tools have descriptions over 1,024 characters, which crowds the context
  • pass
    tools.schemasevery tool has an object input schema
  • pass
    tools.annotations2 of 2 tools declare readOnlyHint or destructiveHint
  • pass
    tools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
  • pass
    tools.token_costabout 992 tokens to load every tool
  • pass
    tools.api_dumptools are not a one-to-one API dump
  • pass
    tools.hidden_textno hidden text in tool names, descriptions, schemas or annotations
stabilityn/a · weight 15
  • n/a
    stability.changes, stability.rug_pull, stability.new_linkstool history recorded for 1 of the 7 days needed
dependenciesn/a · weight 15
  • n/a
    deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

2 tools, about 992 tokens to load them all · tool set acc9f3fd1e38 · checked 2026-11-14 07:03 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 83 / 100

no-repository
provenance55
liveness100
freshness100
hygiene80

+dns-namespace +website +reachable +uptime-100% +updated-1d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remoteauthreachableuptime 30dp50protocollast ok
https://aether-layer.com/api/mcp?src=mcpreg streamable-httpapi_key ${X_API_KEY}yes100%420 ms2025-11-252026-11-14

Tools (2)

agent_readiness_checkread-onlyDeterministically grade an MCP tool catalog or a third-party x402 endpoint. Provide exactly one of: mcp_url (public https MCP server; initialize + tools/list), x402_url (public https resource; the gateway requests it WITHOUT an X-PAYMENT header and reads the 402), or tools (a JSON tool manifest). Never pays or signs a payment. No LLM is used. Requires an API key in Authorization: Bearer or X-Api-Key.
validate_vatread-onlyValidate an EU VAT number (27 member states + XI Northern Ireland). Normalizes the input, checks the national format and checksum locally, then queries VIES (European Commission) live with limited retries. status: valid | invalid (local checksum/format failed, or VIES answered valid=false) | unverified_ms_down (the member state system is down) | unverified. Results are cached across instances to respect VIES rules: valid/invalid 24 h, unverified 10 min; checked_at = time of the original VIES check, cache_age_s = its age in seconds. Never returns invalid because VIES is unavailable. The VIES name/address are never returned: pass your own name and/or address to get name_match / address_match booleans, computed locally (not sent to VIES; null when VIES has no data). Requires an API key in Authorization: Bearer or X-Api-Key. Controllo automatico: regole locali di formato e checksum più una consultazione live del VIES (Commissione europea). Non è un'attestazione fiscale né una consulenza legale; i dati VIES provengono dalle banche dati degli Stati membri. Conserva una tua traccia della consultazione VIES. / Automated check: local format/checksum rules plus a live query of VIES (European Commission). Not a tax attestation and not legal advice; VIES data come from the member states' databases. Keep your own record of the VIES consultation. / Automatische Prüfung: lokale Format- und Prüfziffernregeln plus eine Live-Abfrage von VIES (Europäische Kommission). Keine steuerliche Bescheinigung und keine Rechtsberatung; die VIES-Daten stammen aus den Datenbanken der Mitgliedstaaten. Bewahren Sie einen eigenen Nachweis der VIES-Abfrage auf.

Schemas: list_tools.

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Official server.json
{
  "name": "com.aether-layer/eu-vat-validate",
  "icons": [
    {
      "src": "https://aether-layer.com/icon.svg",
      "sizes": [
        "any"
      ],
      "mimeType": "image/svg+xml"
    }
  ],
  "title": "Aether Layer: EU VAT number validation (VIES)",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://aether-layer.com/api/mcp?src=mcpreg",
      "type": "streamable-http",
      "headers": [
        {
          "name": "X-Api-Key",
          "isSecret": true,
          "isRequired": true,
          "description": "Aether API key. Free key: POST https://aether-layer.com/api/v0/keys with body {} (no email). 20 validate_vat calls per day, reset at midnight Europe/Rome.",
          "placeholder": "alk_free_..."
        }
      ]
    }
  ],
  "version": "0.3.1",
  "websiteUrl": "https://aether-layer.com/en/vat-api",
  "description": "Validates EU VAT numbers: local format/checksum for 27 states + XI, then VIES (cached 24 h)."
}