APITier exposes your subscribed APIs as MCP tools so your AI client can run live address lookup, email validation, VAT checks, barcode generation, and web extraction — all with one MCP key.
8+
MCP Tools
1
MCP Key
99.9%
Uptime SLA
MCP Config — paste into Claude Desktop, Cursor or Windsurf
{
"mcpServers": {
"apitier": {
"command": "npx",
"args": ["-y", "@apitier/mcp-server"],
"env": {
"APITIER_MCP_KEY": "your-mcp-key"
}
}
}
}CAPABILITIES
Generate a single MCP key in your APITier account. That key unlocks every tool from your active subscriptions — no per-API configuration needed.
Add the APITier MCP config to any compatible client. Tools appear automatically in Claude Desktop, Cursor, Windsurf, and custom MCP agent frameworks.
Every MCP tool calls a live production endpoint backed by Royal Mail PAF, HMRC, and other authoritative sources — no demo data, no hallucinated results.
Only tools from your active API subscriptions are exposed through MCP. Unsubscribed APIs are invisible to your agent, keeping usage and cost predictable.
Every MCP tool call returns in under 2 seconds at the 95th percentile. Hosted on AWS EU-West-1 with a 99.9% uptime SLA across all production APIs.
APITier runs as a remote MCP server — no npm package to maintain in your agent codebase. Just a key and a JSON config block in your AI client.
HOW TO START
Browse the API catalogue and subscribe to the production APIs you want your agent to use. Every new account gets 20 complimentary requests — no card required.
Browse API CatalogueOpen your APITier account and generate an MCP key. One key covers all your active API subscriptions — no per-tool tokens or extra configuration.
Paste a single JSON config block into Claude Desktop, Cursor, Windsurf, or any MCP-compatible client. Your subscribed tools appear in the agent automatically.
INTEGRATION
The same JSON config works across all MCP-compatible clients. Swap your key and paste.
~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"apitier": {
"command": "npx",
"args": ["-y", "@apitier/mcp-server"],
"env": {
"APITIER_MCP_KEY": "your-mcp-key"
}
}
}
}MCP TOOLS
Subscribe to the APIs you need. Each subscription adds the corresponding MCP tools to your agent session automatically.
Validate any UK address against Royal Mail PAF. Returns canonical address, geocode, confidence score, and issues list.
Enrich a UK address with fraud signals, delivery risk score, IP geolocation match, and address type detection.
Check email deliverability, MX records, disposable domain detection, and format validation in one call.
Validate international phone numbers — carrier lookup, number type (mobile/landline), and country detection.
Validate UK and EU VAT numbers against HMRC and VIES. Returns registered company name and address.
Extract structured text content from any live URL for use in agent tasks, summarisation, and data pipelines.
Generate EAN-13, Code 128, and other barcode formats. Returns a hosted image URL or base64-encoded image.
Generate QR codes with configurable size and error correction level. Returns a hosted image URL.
FAQ
What is the APITier MCP server?
The APITier MCP server exposes your subscribed production APIs as MCP tools. When you add the APITier config to a compatible AI client, every tool from your active API subscriptions appears automatically — no wrapper code or proxy required.
Which AI clients work with APITier MCP?
APITier MCP works with any MCP-compatible client: Claude Desktop, Cursor, Windsurf, and custom agent frameworks using the MCP SDK. New clients are supported as the MCP ecosystem grows.
Do I need a separate MCP key and API key?
Yes — they serve different purposes. Your API key authenticates direct REST calls to the production APIs. Your MCP key authenticates the MCP server and controls which tools your AI client can access based on your active subscriptions.
Which tools are available through MCP?
The MCP server exposes tools for UK address validation, address enrichment with fraud signals, email validation, phone validation, VAT number validation, web content extraction, barcode generation, and QR code generation — one tool per subscribed API.
Is the MCP server hosted or self-hosted?
APITier provides a remote MCP server that runs via npx — no hosted infrastructure to manage on your side. The npx command downloads and runs a local server process that connects securely to the APITier production API endpoints.
Can I use MCP tools and the direct REST APIs together?
Yes. Your API key and MCP key both use the same underlying production APIs. You can call address lookup directly from your backend and use the same API as an MCP tool in Claude — all authenticated from one APITier account.
How does subscription gating work?
The MCP server checks your active subscriptions on each session. If you have an Address Agent subscription, those tools are available. If a subscription expires or is cancelled, those tools are removed from the next MCP session automatically.
Are there rate limits on MCP tool calls?
MCP tool calls consume request credits from your API subscription plan — the same credits used for direct REST calls. If a tool call would exceed your remaining credits, it returns a clear quota exceeded response that your agent can handle gracefully.
Sign up, subscribe to the APIs you need, and paste one config block into your AI client.