Aether Layer: EU VAT number validation (VIES) for Grok
com.aether-layer/eu-vat-validate
Validates EU VAT numbers: local format/checksum for 27 states + XI, then VIES (cached 24 h).
client:Grok
transport:streamable-http
tools:2
Install Aether Layer: EU VAT number validation (VIES) in Grok
.mcp.json (in your project root)
{
"mcpServers": {
"eu-vat-validate": {
"type": "http",
"url": "https://aether-layer.com/api/mcp?src=mcpreg"
}
}
}Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs