Aether Layer: EU VAT number validation (VIES) for Claude.ai

com.aether-layer/eu-vat-validate

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

client:Claude.ai transport:streamable-http tools:2

Install Aether Layer: EU VAT number validation (VIES) in Claude.ai

Settings → Connectors → Add custom connector

https://aether-layer.com/api/mcp?src=mcpreg

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

validate_vat
agent_readiness_check

Aether Layer: EU VAT number validation (VIES) in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

Aether Layer: EU VAT number validation (VIES) MCP server