FabTally Valid

Name: FabTally Valid
Author: zvmzaretsky

by zvmzaretskyversion 1.0.0i★ 0iRuns in the cloud

Registry nameio.github.zvmzaretsky/validation-suite

How to install

What it does

Validation suite: EU VAT (VIES), IBAN mod-97, email (MX+disposable), geo place lookup, VIN decode.

Connects Runs in the cloud
Account or key No key needed
Category Chat & email

Install

Pick the AI app you use, then copy the settings.

Passed 4/4 checks · What you ask goes through the maker’s server (valid.fabtally.com)

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 2 min

No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it

Open Claude’s Connectors page
CustomizeConnectors
Done
Click “+ Add” → “Add custom connector” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameFabTally Valid
Remote MCP server URL · Addresshttps://valid.fabtally.com/mcp
Leave Authentication as Claude detected it, then click Add
Done
Turn it on in a chat
+ConnectorsFabTally Valid
Done
Try it
Use FabTally Valid and tell me what you can do for me, then show me one thing
✓ If Claude says it is using FabTally Valid or shows a FabTally Valid tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with ChatGPT on business plans only

ChatGPT Business, Enterprise or Edu on the web, added by a workspace admin or owner · On Free, Plus or Pro: your ChatGPT plan cannot connect MCP yet

Open ChatGPT’s add-MCP page on the web
Plugins+Add custom MCP server
Done
Fill in the name and address
Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin
Name · NameFabTally Valid
Connection · Addresshttps://valid.fabtally.com/mcp
Done
Pick FabTally Valid in a chat
Start a new chat and pick FabTally Valid from your plugins before typing
Done
Try it
Use FabTally Valid and tell me what you can do for me, then show me one thing
✓ If ChatGPT says it is using FabTally Valid or shows a FabTally Valid tool in the answer, you are connected

Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Claude Code · about 2 min

No key, nothing to install

Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --transport http --scope user validation-suite https://valid.fabtally.com/mcp

Done

Type /mcp in Claude Code
You should see FabTally Valid listed as connected
Done
Try it
Use FabTally Valid and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using FabTally Valid or shows a FabTally Valid tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 2 min

No key, nothing to install

Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use FabTally Valid and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using FabTally Valid or shows a FabTally Valid tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 2 min

No key, nothing to install

Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use FabTally Valid and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using FabTally Valid or shows a FabTally Valid tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://valid.fabtally.com/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use FabTally Valid💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport http --scope user validation-suite https://valid.fabtally.com/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "validation-suite": {
      "url": "https://valid.fabtally.com/mcp"
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "validation-suite": {
      "type": "http",
      "url": "https://valid.fabtally.com/mcp"
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: Not on npm/PyPI
Licence i: No licence stated
Connection: Runs in the cloud
Transport: streamable-http
Latest versioni: 1.0.0
Categoryi: Chat & email
Published to registryi: Aug 1, 2026
Code last changedi: Aug 1, 2026
Maker: zvmzaretsky
Repo: zvmzaretsky/validation-suite-mcp
Website: valid.fabtally.com
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

Claude ChatGPT Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

All apps, with pros and cons →

What it can do

Tool names and descriptions exactly as the server reported them on Nov 11, 2026. The maker wrote them, not us; we show them as plain text.

validate_vat
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
validate_iban
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.
validate_email
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 ad
geo_lookup
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 coordi
decode_vin
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 pla

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 12, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account zvmzaretsky, which owns the repo
✓ Pass
Still maintained
Code last changed 3 months ago
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✓ Pass
Endpoint responds
Responded in 559 ms (HTTP 200)
– Not applicable
Sign-in with OAuth
No sign-in needed
✓ Pass
No hidden instructions in tool descriptions
Read 5 tool descriptions and found no hidden instructions to the AI

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Chat & emaili

More stars than 0% of the other 1975 servers in this category
Published to the registry more recently than 18% of the other 1975 servers in this category
Basic checks equal to or better than 100% of the other 1975 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is FabTally Valid safe?

It passed 4 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed 3 months ago, and the latest version (1.0.0) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT Business and above.

What can I use instead?

In the same category: Inbox Zero, draw.io, TradingMCP

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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.

FabTally Valid

What it does

Install

Open Claude’s Connectors page

Click “+ Add” → “Add custom connector” and fill in these 2 fields

Turn it on in a chat

Try it

Open ChatGPT’s add-MCP page on the web

Fill in the name and address

Pick FabTally Valid in a chat

Try it

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Over the web

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Chat & emaili

Common questions

Others in the same category

Inbox Zero

draw.io

TradingMCP

README from the maker

FabTally Valid — MCP server

Tools (all paid; a call with no payment returns the decoded x402 402 challenge)

Transports