FabTally Valid Server
FreeNot checkedProvides a validation suite for VAT, IBAN, email, geo lookup, and VIN decoding, with per-call pricing and optional x402 payment support.
About
Provides a validation suite for VAT, IBAN, email, geo lookup, and VIN decoding, with per-call pricing and optional x402 payment support.
README
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.
Installing FabTally Valid Server
This server has no published package — it is built from source. Open the repository and follow its README.
▸ github.com/zvmzaretsky/validation-suite-mcpFAQ
Is FabTally Valid Server MCP free?
Yes, FabTally Valid Server MCP is free — one-click install via Unyly at no cost.
Does FabTally Valid Server need an API key?
No, FabTally Valid Server runs without API keys or environment variables.
Is FabTally Valid Server hosted or self-hosted?
Self-hosted: the server runs locally on your machine via the install command above.
How do I install FabTally Valid Server in Claude Desktop, Claude Code or Cursor?
Open FabTally Valid Server on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.
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