Postio — UK Address, Postcode, Email & Phone Validation
uk.co.postio/postcode-address-validation · v0.1.5
Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.
Connect Runs on your machine
claude mcp add postcode-address-validation -e POSTIO_API_KEY=<POSTIO_API_KEY> -e POSTIO_BASE_URL=<POSTIO_BASE_URL> -- npx -y @postio/[email protected]{
"mcpServers": {
"postcode-address-validation": {
"command": "npx",
"args": [
"-y",
"@postio/[email protected]"
],
"env": {
"POSTIO_API_KEY": "<POSTIO_API_KEY>",
"POSTIO_BASE_URL": "<POSTIO_BASE_URL>"
}
}
}
}{
"mcpServers": {
"postcode-address-validation": {
"command": "npx",
"args": [
"-y",
"@postio/[email protected]"
],
"env": {
"POSTIO_API_KEY": "<POSTIO_API_KEY>",
"POSTIO_BASE_URL": "<POSTIO_BASE_URL>"
}
}
}
}{
"servers": {
"postcode-address-validation": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@postio/[email protected]"
],
"env": {
"POSTIO_API_KEY": "<POSTIO_API_KEY>",
"POSTIO_BASE_URL": "<POSTIO_BASE_URL>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
POSTIO_API_KEYRequired, secret | Postio API key (pk_…). Free key, first 100 lookups on us, no card: https://postio.co.uk/signup |
POSTIO_BASE_URLOptional | Override the API base URL. Defaults to https://api.postio.co.uk/v1 (include /v1). Only needed for staging. |
Details
| Package | @postio/[email protected] (NPM, stdio) |
| First published | 23 Oct 2026 |
| Last updated | 23 Oct 2026 |
| Registry name | uk.co.postio/postcode-address-validation |
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