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FabTally Valid MCP Server

FabTally Valid MCP Server

by zvmzaretsky
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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.

Related MCP server: phone-validation-x402

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.

Available Tools

5 tools
decode_vinDecode a VIN via NHTSA vPIC (paid $0.002)AInspect

PAID $0.002 (x402, USDC on Base). Decode a Vehicle Identification Number: give {vin} and get a 17-char format + North-American check-digit validation and a full decode via NHTSA's public vPIC API — make, model, year, body class, engine, plant country and more. VIN-only (never plate→owner). Without payment returns the x402 challenge; pass x_payment to settle.

Inputs: vin (required), x_payment.

geo_lookupResolve a country / state / city to ISO codes (paid $0.002)AInspect

PAID $0.002 (x402, USDC on Base). Resolve a place against a bundled open dataset (no per-day API limits). Give {query:"Munich, Bavaria, Germany"} OR {country, state, city} and get normalized names, ISO 3166-1/-2 codes, the country→subdivision→city hierarchy, population and coordinates, and confirmation the place exists. Without payment returns the x402 challenge; pass x_payment to settle.

Inputs: city, query, state, country, +1 more.

validate_emailValidate an email: syntax + MX + disposable + role (paid $0.002)AInspect

PAID $0.002 (x402, USDC on Base). Validate an email address: give {email} and get RFC-ish syntax validation, a LIVE MX-record (DNS) existence check, disposable/throwaway-domain detection (bundled blocklist), and a role-address flag (info@, admin@…). STATELESS and non-PII — the address is never stored and no SMTP mailbox is probed. Without payment returns the x402 challenge; pass x_payment to settle.

Inputs: email (required), x_payment.

validate_ibanValidate an IBAN (mod-97) + extract bank code (paid $0.001)AInspect

PAID $0.001 (x402, USDC on Base). Validate an IBAN: give {iban} and get ISO 13616 length + mod-97 checksum validation, the country, the human-formatted grouping, and the bank identifier (e.g. German Bankleitzahl, UK bank code + sort code) extracted from the BBAN where derivable. Pure-offline. Without payment returns the x402 challenge.

Inputs: iban (required), x_payment.

validate_vatValidate an EU VAT number via VIES (paid $0.003)AInspect

PAID $0.003 (x402, USDC on Base). FLAGSHIP. Validate an EU/EEA VAT number: give {country_code, vat_number} and get a per-country format + checksum pre-check AND a LIVE lookup against the official VIES service — returning valid/registered plus the registered company name & address when VIES provides them (cached ~1h to shield the flaky VIES). Without payment returns the x402 challenge; pass x_payment to settle.

Inputs: vat_number (required), country_code (required), x_payment.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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    Deploy Server
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    TDQS

    A4.4/5.0

    Scored across 5 tools

    Disambiguation5/5

    Each tool targets a distinct entity type (VAT, IBAN, email, location, VIN) with no overlap. The descriptions clearly differentiate the validation/lookup purpose of each.

    Naming Consistency4/5

    Three tools follow the validate_<entity> pattern, while two use different verbs (geo_lookup, decode_vin). The pattern is still predictable and readable, but minor inconsistency exists.

    Tool Count5/5

    Five tools is a well-scoped number for a validation/lookup server. Each tool has a clear, distinct function and none feel redundant or excessive.

    Completeness4/5

    The server covers common validation and lookup needs well. A few additional validators (phone, credit card) could be added, but the current set is coherent and functional for its apparent purpose.

    Maintenance

    ActivityInactive
    ResponsivenessOutdated data

    Resources

    Related MCP Connectors

    Related MCP Servers

    • phone-validation-x402

      Br0ski777
      A
      license
      Not graded
      quality
      C
      maintenance
      Validates phone numbers worldwide (carrier, line type, country) via single or batch requests, with pay-per-call using x402 micropayments (USDC on Base) — no API key required.
      MIT