Commerce validators: live EU VAT (VIES), EORI, email/MX lookups; IBAN/ABA/GTIN checksums; VAT rates.

🛠️ Key Features

Live EU VAT (VIES) verification and EORI checks
Email and MX lookup capabilities
IBAN, ABA, and GTIN checksum validation
VAT rate data integration
Topics: ai-agents, ecommerce, eori, fintech, iban, mcp, mcp-server, model-context-protocol, validation, vat, vies

🚀 Use Cases

Validate cross-border trade identifiers and VAT status
Screen participants in ecommerce and fintech workflows
Pre-transaction checks for VAT compliance and VAT rate retrieval
Validate contact details and shipping identifiers via email/MX lookups

⚡ Developer Benefits

MCP-compatible server for model-context workflows
Grounded in real-world validation services and tax data
Clear taxonomy: topics and tools aligned for cataloging and discovery

⚠️ Limitations

Data is constrained to provided validators and checks; external schemas not guaranteed
Real-time external service availability may affect response latency

{ "type": "object", "properties": { "routing_number": { "title": "Routing Number", "type": "string" } }, "required": [ "routing_number" ], "title": "validate_aba_routingArguments" }

{ "type": "object", "properties": { "vat_number": { "title": "Vat Number", "type": "string" } }, "required": [ "vat_number" ], "title": "validate_eu_vatArguments" }

{ "type": "object", "properties": { "email_or_domain": { "title": "Email Or Domain", "type": "string" } }, "required": [ "email_or_domain" ], "title": "check_email_domainArguments" }

{ "type": "object", "properties": { "country_code": { "title": "Country Code", "type": "string" }, "date": { "default": "", "title": "Date", "type": "string" } }, "required": [ "country_code" ], "title": "vat_rate_by_countryArguments" }

{ "type": "object", "properties": { "charge_amount": { "title": "Charge Amount", "type": "number" }, "application_fee_pct": { "default": 0, "title": "Application Fee Pct", "type": "number" }, "application_fee_fixed": { "default": 0, "title": "Application Fee Fixed", "type": "number" }, "processing_pct": { "default": 2.9, "title": "Processing Pct", "type": "number" }, "processing_fixed": { "default": 0.3, "title": "Processing Fixed", "type": "number" }, "fee_bearer": { "default": "seller", "title": "Fee Bearer", "type": "string" } }, "required": [ "charge_amount" ], "title": "stripe_connect_splitArguments" }

{ "type": "object", "properties": { "gross_sales": { "title": "Gross Sales", "type": "number" }, "refunds": { "default": 0, "title": "Refunds", "type": "number" }, "processing_fees": { "default": 0, "title": "Processing Fees", "type": "number" }, "chargebacks": { "default": 0, "title": "Chargebacks", "type": "number" }, "other_deductions": { "default": 0, "title": "Other Deductions", "type": "number" }, "actual_deposit": { "anyOf": [ { "type": "number" }, { "type": "null" } ], "default": null, "title": "Actual Deposit" } }, "required": [ "gross_sales" ], "title": "payout_reconciliationArguments" }

{ "type": "object", "properties": { "avg_daily_sales": { "title": "Avg Daily Sales", "type": "number" }, "lead_time_days": { "title": "Lead Time Days", "type": "number" }, "safety_stock": { "default": 0, "title": "Safety Stock", "type": "number" }, "on_hand": { "anyOf": [ { "type": "number" }, { "type": "null" } ], "default": null, "title": "On Hand" } }, "required": [ "avg_daily_sales", "lead_time_days" ], "title": "reorder_pointArguments" }

Connect (hosted, remote — Streamable HTTP)

code

https://mcp.scienceswarm.org/mcp

json

{ "mcpServers": { "commerce-validators": { "url": "https://mcp.scienceswarm.org/mcp" } } }

On the hosted endpoint the three live-registry tools (EU VAT, EORI, email/MX) need a Pro key — $19 one-time at https://ops.scienceswarm.org/mcp, then connect with https://mcp.scienceswarm.org/mcp?key=YOUR_KEY. Everything else is free, no key, no account.

Self-hosting this repo is completely free — every tool, no gating, no key. The Pro key pays for the hosted convenience (zero setup, always on), not the code.

Tools

Tool

What it does

Hosted tier

validate_eu_vat

Live EU VIES lookup — is a VAT number registered? returns trader name+address

Pro

validate_eori

Live EU customs (EOS) lookup — is an EORI number valid? Required for EU imports/exports

Pro

check_email_domain

Live DNS/MX lookup — can this domain receive email?

Pro

vat_rate_by_country

EU VAT rates (standard/reduced/…) in force on a date, incl. regional exceptions

Free

validate_iban

ISO-7064 mod-97 + country length

Free

validate_aba_routing

US ABA routing-number checksum

Free

validate_gtin

GTIN-8/12/13/14 barcode check digit

Free

stripe_connect_split

Stripe Connect three-way fee split (buyer/Stripe/platform/seller)

Free

payout_reconciliation

Gross → deductions → expected payout, flags the unexplained gap

Free

reorder_point

Lead-time demand + safety stock; reorder-now verdict

Free

All tools return structured JSON. Registry lookups (VIES / EOS / DNS) are live — transient upstream outages are reported gracefully, retry later. Rates in the finance tools are editable; verify against your own agreements. No secrets or customer data are stored.

Install

Tools (10)

validate_ibanvalidate_gtinvalidate_aba_routingvalidate_eu_vatvalidate_eoricheck_email_domainvat_rate_by_countrystripe_connect_split

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://mcp.scienceswarm.org/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "commerce-validators": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://mcp.scienceswarm.org/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.

Commerce Validators

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

Topics

validate_iban

validate_gtin

validate_aba_routing

validate_eu_vat

validate_eori

check_email_domain

vat_rate_by_country

stripe_connect_split

payout_reconciliation

reorder_point

Commerce Validators — MCP server

Connect (hosted, remote — Streamable HTTP)

Tools

Self-host

Install

Remote endpoint

charge_amount	number	required
application_fee_pct	number	optional
application_fee_fixed	number	optional
processing_pct	number	optional
processing_fixed	number	optional
fee_bearer	string	optional

gross_sales	number	required
refunds	number	optional
processing_fees	number	optional
chargebacks	number	optional
other_deductions	number	optional
actual_deposit	any	optional

avg_daily_sales	number	required
lead_time_days	number	required
safety_stock	number	optional
on_hand	any	optional