Limitguard

Lead validation for lead generation agencies, sales agents and their clients. Check the company behind each lead against the KVK and KBO registers, EU VAT and sanctions lists. Proceed, review or block, with the source on every line. Limitguard is a lead validation service for lead generation agencies, sales agents and their clients. It checks the company behind each lead against the official business registers (KVK in the Netherlands, KBO in Belgium), EU VAT (VIES), the OFAC, EU and UN sanctions lists and the email domain, and returns proceed, review or block with the source on every line. Developers and AI agents use the same checks over the HTTP API, the MCP server and the A2A service, hosted in the EU, paid per call in USDC or from an API key’s prepaid balance.

Quickstart

Run your first lead check in under 3 minutes

API Reference

Explore every endpoint in the interactive playground

Sandbox

Test for free with a sandbox key, no wallet

x402 Protocol

Pay per call with USDC, no subscription needed

Why Limitguard?

A lead is only worth passing on if the company behind it is real and active. Limitguard checks each lead against the official register for its country before you deliver it, and names the source for every check, so you and your client can see why a lead was passed, flagged or blocked. Check one Dutch or Belgian lead with a single API call:

curl -X POST https://api.limitguard.ai/v1/leads/verify \
  -H "X-API-Key: lg_live_..." \
  -H "Content-Type: application/json" \
  -d '{"country": "NL", "company_number": "12345678", "name": "Acme Corp BV", "email": "sales@acme-corp.nl"}'

The answer carries a verdict (for example real_active or not_found), a 0-100 lead_score, flags such as vat_owner_mismatch or disposable_email, and the findings behind them. See the Lead Verify reference for every field. For a company check outside a lead flow, POST /v1/entity/check returns a trust score and a recommendation:

curl -X POST https://api.limitguard.ai/v1/entity/check \
  -H "X-API-Key: lg_live_..." \
  -H "Content-Type: application/json" \
  -d '{"entity_name": "Acme Corp BV", "country": "NL", "kvk_number": "12345678"}'

Response

{
  "trust_score": 87,
  "trust_level": "high",
  "cluster": "established_eu_sme",
  "recommendation": "proceed",
  "sources_checked": 3,
  "processing_time_ms": 247
}

What Gets Checked

KVK and KBO registers

Dutch and Belgian business registers: is the company real and active, and do its name and address match

EU VAT (VIES)

Is the VAT number valid, and is it registered to this company

Sanctions lists

OFAC, EU and UN lists; the company check also screens OpenSanctions (80+ global lists)

Email and website domain

Mail server and disposable domains for a lead; WHOIS age, DNS and SSL for a company

IBAN

Bank account country and structure

Jurisdiction

CPI and the FATF grey and black lists, in the company check

Wallet Format Check

ETH, BTC, SOL address format validation. Full wallet screening (OFAC match, on-chain signals) is a separate, free tool: see Trust Architecture.

How It Works

Send the lead

POST the company number or name and the country, plus whatever else the lead holds: VAT number, email, website domain, address or IBAN.

Parallel checks

Limitguard queries every source the details allow, in parallel: the business register, VIES, sanctions lists, the email domain and the IBAN.

Get a verdict

Lead Verify returns a verdict, a 0-100 lead score and flags. The company check returns a trust score (0-100), a risk level, an entity cluster and a recommendation: proceed, review, enhanced due diligence or block. Every check names its source.

Key Features

Feature	Description
Pay-per-use	No subscription required. Pay with USDC via x402 protocol.
Sandbox mode	Test free with realistic mock data. No wallet needed. The sandbox covers entity, risk and KYB checks; Lead Verify needs a live key.
Two quality tiers	Choose cached or fresh on `/v1/entity/check`: see Pricing.
AI agent native	MCP, A2A, and x402 discovery. Agents find and use Limitguard autonomously.
Hosted in the EU	API and dashboard in the EU, database in Ireland. The data processing agreement and its sub-processor list (section 6) are published, with retention periods. Operated by Ambulatio Consulting B.V. (trading as Limitguard) in the Netherlands.
Self-verifying	Limitguard verifies itself with its own API. Our score is public.

Who Uses Limitguard

Lead generation agencies: check every lead before you deliver it to a client
Sales agents and their clients: confirm that the company behind a lead is real and active
B2B marketing and sales teams: check a lead list in the dashboard (5 free lead checks after sign-up, no card) or over the API
Developers and AI agents: the same checks over the HTTP API, MCP and A2A

Ready to start?

Run your first lead check in under 3 minutes

Get Started

Core Concepts

Guides

Post-mortems

Introduction

Limitguard

Quickstart

API Reference

Sandbox

x402 Protocol

Why Limitguard?

What Gets Checked

KVK and KBO registers

EU VAT (VIES)

Sanctions lists

Email and website domain

IBAN

Jurisdiction

Wallet Format Check

How It Works

Key Features

Who Uses Limitguard

Ready to start?

​Limitguard

Quickstart

API Reference

Sandbox

x402 Protocol

​Why Limitguard?

​What Gets Checked

KVK and KBO registers

EU VAT (VIES)

Sanctions lists

Email and website domain

IBAN

Jurisdiction

Wallet Format Check

​How It Works

​Key Features

​Who Uses Limitguard

Ready to start?

Limitguard

Why Limitguard?

What Gets Checked

How It Works

Key Features

Who Uses Limitguard