APITier Server

MCP (Model Context Protocol) server exposing all APITier utility APIs as tools for AI agents.

Two integration modes:

Mode	Best for
Hosted HTTP — https://mcp.apitier.com	Anthropic connector directory, remote agents, server-to-server
stdio (npx) — runs locally	Claude Desktop, Cursor, Windsurf, local agents

Both modes use the same MCP Key — one key unlocks all your subscribed services.

Postman collection: import the ready-made collection to test all endpoints instantly: https://raw.githubusercontent.com/apitier/apitier-mcp-server/main/postman/APITier%20MCP%20Server.postman_collection.json

In Postman: Import → Link → paste URL → set mcp_api_key collection variable.

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Tools Available

🇬🇧 UK KYC Onboarding

Tool	Description
kyc_onboard_uk	Full UK business onboarding check in one call. Validates VAT, verifies Companies House, retrieves PSC (beneficial owners), and confirms the registered address. Returns PASS / REVIEW / FAIL, a risk score, and the full data bundle. Requires postcode + vat + leadAgent subscriptions.

Example output:

{
  "decision": "PASS",
  "risk_score": 95,
  "flags": [],
  "checks": {
    "company": { "status": "active", "data": { ... } },
    "psc":     { "status": "found",  "data": { ... } },
    "vat":     { "status": "valid",  "data": { ... } },
    "address": { "status": "verified", "data": { ... } }
  }
}

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🇬🇧 UK Address & Property

Tool	Description
verify_uk_address	Verify a UK address against Royal Mail PAF — returns canonical address, UPRN, UDPRN, and per-delivery-point geocode
lookup_uprn	Look up a full AddressBase record by UDPRN — returns UPRN, PAF canonical address, coordinates. Use UDPRN from verify_uk_address
lookup_uk_postcode	UK postcode → full PAF address list + district, ward, county, country, and geocode

🇬🇧 UK Business & Compliance

Tool	Description
verify_uk_company	Look up a UK company on Companies House by name or number — status, address, SIC codes, filing health
get_company_psc	Persons with Significant Control register for a UK company — required for AML beneficial ownership checks
validate_sort_code	Validate a UK sort code and optionally a bank account number (Vocalink modulus check). No API key required.

🇬🇧🇪🇺 UK + EU VAT Compliance

Tool	Description
validate_vat	Validate UK and EU VAT numbers — checks HMRC for GB numbers, EU VIES for all other country prefixes. Returns registered business name and address. Accepts any country prefix (e.g. GB123456789, DE123456789, FR12345678901).

🌍 Global Identity

Tool	Description
validate_email	Validate email — syntax, MX, SMTP reachability, disposable domain check. Works for any email address globally.
validate_phone	Validate and parse phone numbers — accepts any international format, returns country, carrier, and line type.

🇮🇳 India

Tool	Description
lookup_india_pincode	Indian PIN code → state / district / town

🌍 Utilities

Tool	Description
generate_barcode	Generate barcode image (Code128, EAN-13, UPC, and more)
generate_qrcode	Generate QR code image with optional logo and colour
convert_data	Convert between CSV, JSON, XML, YAML

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Quick Start

1. Get your MCP Key

Sign up at apitier.com → Account → AI & MCP → Generate MCP Key.

Your MCP Key (mcp_...) automatically unlocks the tools for every APITier service you have subscribed to. No per-service configuration needed.

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Hosted HTTP Endpoint

POST https://mcp.apitier.com/mcp?x-api-key=YOUR_MCP_KEY

Pass your MCP Key as the x-api-key query parameter. The endpoint resolves your subscribed services and returns only the tools available to you.

Required headers:

Content-Type: application/json
Accept: application/json, text/event-stream

Test with curl:

curl -s -X POST 'https://mcp.apitier.com/mcp?x-api-key=YOUR_MCP_KEY' \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | jq .

Call a tool:

curl -s -X POST 'https://mcp.apitier.com/mcp?x-api-key=YOUR_MCP_KEY' \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "verify_uk_company",
      "arguments": { "q": "03977902" }
    }
  }' | jq .

Health check:

curl https://mcp.apitier.com/health

Use with any HTTP MCP client

{
  "mcpServers": {
    "apitier": {
      "url": "https://mcp.apitier.com/mcp?x-api-key=YOUR_MCP_KEY"
    }
  }
}

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Claude Desktop (stdio)

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

With MCP Key (recommended — single key, all subscribed tools):

{
  "mcpServers": {
    "apitier": {
      "command": "npx",
      "args": ["-y", "@apitier/mcp-server"],
      "env": {
        "APITIER_MCP_KEY": "mcp_your-key-here"
      }
    }
  }
}

With individual service keys (if you prefer explicit control):

{
  "mcpServers": {
    "apitier": {
      "command": "npx",
      "args": ["-y", "@apitier/mcp-server"],
      "env": {
        "APITIER_POSTCODE_KEY":     "key-from-postcode-subscription",
        "APITIER_LEAD_AGENT_KEY":   "key-from-lead-agent-subscription",
        "APITIER_EMAIL_KEY":        "key-from-email-subscription",
        "APITIER_PHONE_KEY":        "key-from-phone-subscription",
        "APITIER_VAT_KEY":          "key-from-vat-subscription",
        "APITIER_BARCODE_KEY":      "key-from-barcode-subscription",
        "APITIER_CONVERT_DATA_KEY": "key-from-data-conversion-subscription"
      }
    }
  }
}

Restart Claude Desktop after saving. Only tools for your active subscriptions will appear.

---

Cursor / Windsurf / VS Code

{
  "mcp": {
    "servers": {
      "apitier": {
        "command": "npx",
        "args": ["-y", "@apitier/mcp-server"],
        "env": {
          "APITIER_MCP_KEY": "mcp_your-key-here"
        }
      }
    }
  }
}

---

LangChain (Python)

stdio:

from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client
from langchain_mcp_adapters.tools import load_mcp_tools
from langgraph.prebuilt import create_react_agent
from langchain_anthropic import ChatAnthropic

async def main():
    server_params = StdioServerParameters(
        command="npx",
        args=["-y", "@apitier/mcp-server"],
        env={"APITIER_MCP_KEY": "mcp_your-key-here"},
    )

    async with stdio_client(server_params) as (read, write):
        async with ClientSession(read, write) as session:
            await session.initialize()
            tools = await load_mcp_tools(session)

            model = ChatAnthropic(model="claude-sonnet-4-6")
            agent = create_react_agent(model, tools)

            result = await agent.ainvoke({
                "messages": "Validate this email: [email protected] and look up postcode SW1A 1AA"
            })
            print(result["messages"][-1].content)

HTTP endpoint:

from mcp import ClientSession
from mcp.client.streamable_http import streamablehttp_client

async def main():
    async with streamablehttp_client(
        "https://mcp.apitier.com/mcp?x-api-key=mcp_your-key-here"
    ) as (read, write, _):
        async with ClientSession(read, write) as session:
            await session.initialize()
            tools = await load_mcp_tools(session)
            # use tools with your agent...

---

Vercel AI SDK (TypeScript)

stdio:

import { experimental_createMCPClient as createMCPClient } from "ai";
import { Experimental_StdioMCPTransport as StdioMCPTransport } from "ai/mcp-stdio";
import { anthropic } from "@ai-sdk/anthropic";
import { generateText } from "ai";

const mcp = await createMCPClient({
  transport: new StdioMCPTransport({
    command: "npx",
    args: ["-y", "@apitier/mcp-server"],
    env: { APITIER_MCP_KEY: process.env.APITIER_MCP_KEY! },
  }),
});

const tools = await mcp.tools();

const { text } = await generateText({
  model: anthropic("claude-sonnet-4-6"),
  tools,
  prompt: "Verify this UK company: Google UK Limited",
});

await mcp.close();

HTTP endpoint:

import { experimental_createMCPClient as createMCPClient } from "ai";

const mcp = await createMCPClient({
  transport: {
    type: "sse",
    url: `https://mcp.apitier.com/mcp?x-api-key=${process.env.APITIER_MCP_KEY}`,
  },
});

const tools = await mcp.tools();

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Environment Variables

Variable	Description
APITIER_MCP_KEY	Recommended. Single MCP Key from account page — resolves all subscribed service keys automatically
APITIER_POSTCODE_KEY	UK Postcode subscription — enables verify_uk_address, lookup_uprn, lookup_uk_postcode
APITIER_LEAD_AGENT_KEY	Lead Agent subscription — enables verify_uk_company, get_company_psc
APITIER_EMAIL_KEY	Email Validation subscription — enables validate_email
APITIER_PHONE_KEY	Phone Validation subscription — enables validate_phone
APITIER_VAT_KEY	VAT Validation subscription — enables validate_vat
APITIER_PINCODE_KEY	India Pincode subscription — enables lookup_india_pincode
APITIER_BARCODE_KEY	Barcode/QR Code subscription — enables generate_barcode, generate_qrcode
APITIER_CONVERT_DATA_KEY	Data Conversion subscription — enables convert_data

validate_sort_code requires no API key — it is always available.

kyc_onboard_uk requires APITIER_POSTCODE_KEY + APITIER_LEAD_AGENT_KEY + APITIER_VAT_KEY (or a unified APITIER_MCP_KEY with all three subscriptions). The tool only appears when all three services are active.

Individual service keys take precedence over APITIER_MCP_KEY if both are set.

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Development

git clone https://github.com/apitier/apitier-mcp-server.git
cd apitier-mcp-server
npm install
npm run build
APITIER_MCP_KEY=mcp_your-key node dist/index.js

Test with the MCP Inspector:

npx @modelcontextprotocol/inspector npx @apitier/mcp-server

Set APITIER_MCP_KEY in the inspector's environment variables panel.

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Example Agent Prompts

Once connected to Claude Desktop or any MCP-compatible agent:

UK KYC onboarding

• "Run a KYC check on Vodafone Group Plc, VAT GB778476239, postcode EC1A 1BB"
• "Onboard this supplier: company name Tesco PLC, VAT GB220437023"
• "Verify this business before we sign the contract: company number 00445790"

UK address & property

• "Verify this address and give me its UPRN: 10 Downing Street, SW1A 2AA"
• "Look up UK postcode EC1A 1BB and fill in the address form"

UK business & compliance

• "Verify this UK company on Companies House: Barclays Bank UK PLC"
• "Who are the persons with significant control for company number 00026167?"
• "Validate this UK sort code and account number: 60-16-13 / 31926819"
• "Validate this UK VAT number: GB927065390"
• "Validate this EU VAT number before I send the invoice: DE123456789"

Global identity

• "Validate this list of emails and tell me which ones are invalid"
• "Validate these phone numbers and tell me which country each is from"

Utilities

• "Generate a QR code for apitier.com"
• "Convert this CSV to JSON"