FabTally Valid
Validation suite: EU VAT (VIES), IBAN mod-97, email (MX+disposable), geo place lookup, VIN decode.
Install
Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).
claude mcp add --transport http fabtally-valid 'https://valid.fabtally.com/mcp'{
"mcpServers": {
"fabtally-valid": {
"type": "http",
"url": "https://valid.fabtally.com/mcp"
}
}
}Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
FabTally Valid — MCP server
A developer validation suite — the per-call utilities incumbents charge for (Vatstack $0.01–0.09/call) or lock behind subscriptions, unified. Fronts the Valid HTTP API at **https://valid.fabtally.com**. Holds no private key.
Tools (all paid; a call with no payment returns the decoded x402 402 challenge)
| Tool | Price | What it does |
|---|---|---|
validate_vat | $0.003 | Flagship. EU/EEA VAT: {country_code, vat_number} → per-country format + checksum pre-check AND a live VIES lookup, returning valid/registered plus the registered company name & address when VIES has them (cached ~1h to shield the flaky VIES). |
validate_iban | $0.001 | {iban} → ISO 13616 length + mod-97 checksum, country, human-formatted grouping, and bank identifier (German Bankleitzahl, UK bank code + sort code, …) extracted from the BBAN where derivable. Pure-offline. |
validate_email | $0.002 | {email} → RFC-ish syntax + live MX-record (DNS) existence + disposable/throwaway-domain detection (bundled blocklist) + role-address flag (info@, admin@). Stateless & non-PII: the address is never stored and no SMTP mailbox is probed. |
geo_lookup | $0.002 | {query:"Munich, Bavaria, Germany"} or {country,state,city} → normalized names, ISO 3166-1/-2 codes, country→subdivision→city hierarchy, population and coordinates, over a bundled open dataset (no per-day API limits). |
decode_vin | $0.002 | {vin} → 17-char format + North-American check-digit validation and a full NHTSA vPIC decode: make, model, year, body class, engine, plant country. VIN-only (never plate→owner). |
Every tool also accepts an optional x_payment (base64 x402 payload) that is
forwarded as the X-PAYMENT header to settle the call and return the real result.
Humans can instead prepay by card and use an X-FabTally-Key credit key against
the HTTP API.
Transports
- stdio (portable):
npx fabtally-valid-mcp(bin:fabtally-valid-mcp) - streamable-http (hosted):
https://valid.fabtally.com/mcp
Config: FABTALLY_VALID_BASE (default https://valid.fabtally.com).
Read-only, keyless, stateless, non-PII. Operated by Sunstone Soft (fabtally.com). Not legal, tax, or financial advice.
Frequently asked questions
What is FabTally Valid?
Validation suite: EU VAT (VIES), IBAN mod-97, email (MX+disposable), geo place lookup, VIN decode.
How do I install FabTally Valid?
It runs as a remote server. In Claude Code: claude mcp add --transport http fabtally-valid 'https://valid.fabtally.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.
Does FabTally Valid need an API key?
Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.
Is FabTally Valid open source?
Yes. Its code is on GitHub under the MIT license.
Who maintains FabTally Valid?
It is published by zvmzaretsky. AI.tn lists it but does not maintain or endorse it.
From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.