AI Agent Infrastructure Platform
Give Your AI Agent Real Data. Real APIs. Real Results.
APITier is an AI agent infrastructure platform that connects Claude, Cursor, Windsurf, and custom agents to production APIs through MCP. Run address, verification, barcode, and web extraction tools with one account and one MCP key.
APITier gives AI agents real tools, real data, and real API actions.
No credit card required · Free tier included · Connect in minutes
Looking for the UK Postcode Lookup API?
- ✓120+ countries — UK via Royal Mail PAF, global via OpenStreetMap
- ✓Automatic routing — no country parameter needed
- ✓Geocode (lat/lng) + confidence score in every response
- ✓Fraud signals — IP mismatch, disposable email, invalid phone
- ✓Native MCP tool — works in Claude, Cursor & more
26,000+ developers trust APITier — from Fujitsu and Orange to fast-growing startups
What developers are saying
We integrated the UK postcode API in under an hour. Address lookup accuracy went from ~70% to over 99% overnight — our checkout abandonment dropped noticeably within the first week.
The MCP integration is genuinely impressive. I added APITier to Claude Desktop in minutes and now my agent validates emails and postcodes in real time instead of hallucinating them. Saves me 10+ manual checks a day.
Lead Agent API is the first solution that actually combines email, phone, company lookup, and postcode in a single call with a real quality score. Our sales team stopped wasting time on bad leads within two days.
Lead Intelligence
Validate, Verify, and Research
Every Lead Automatically
Three AI agents — one API key. Score lead quality, verify UK companies against Companies House, and research company directors in seconds. No manual checking. No CRM clutter. Just structured, AI-generated intelligence.
Lead Validate
Score leads 0–100 (grade A–F) by verifying email, phone, company, and postcode in one API call.
Learn moreBusiness Verify
Real-time Companies House due diligence — active status, registered address, VAT, and risk score.
Learn moreDirector Search
Research UK directors — appointment history, dissolved company exposure, address clusters, risk flags.
Learn moreLead Agent API — AI-Powered Lead Intelligence
One API call validates email, phone, company, and postcode — then an AI synthesises every signal into a quality score and plain-English risk summary.
- ✓Email — MX records + disposable domain detection
- ✓Phone — UK format + mobile vs. landline
- ✓Company — Companies House active/dissolved status
- ✓Postcode — Royal Mail PAF validation
- ✓AI grade A–F with 0–100 quality score
5 free
trial requests
< 3s
response time
1 key
all 3 agents
Global Address Intelligence
Validate Addresses in 120+ Countries
with One API Call
The Address Agent automatically routes each request to the right data source — UK addresses to Royal Mail PAF, everything else to OpenStreetMap. Geocode, confidence score, fraud signals, and delivery risk returned in the same JSON schema everywhere.
120+ Country Coverage
UK addresses validated against Royal Mail PAF for building-level confirmation. All other countries use OpenStreetMap data. Automatic routing — no country parameter needed.
Geocode & Confidence Score
Every response includes latitude/longitude, HIGH/MEDIUM/LOW confidence, and a canonical address — identical schema for UK and global.
Fraud Signals & Delivery Risk
IP geo-mismatch detection (any country), disposable email check, invalid phone flag, and delivery risk scoring — all in one API call.
One API. UK and 120+ Countries.
120+
Countries
20
Free requests
99.9%
Uptime SLA
Global Checkout Fraud Signals
Fraud Signals for Every Checkout
— UK and Global
Validate addresses in 120+ countries and run real-time fraud signals at checkout in under 200ms. IP geo-mismatch works for any country. UK deprivation index for UK addresses. All signals in one API call.
Global Fraud Signals — Single API Call
Scenario: overseas IP ordering a delivery to London (deprived area)
120+
Countries
<200ms
Response time
4
Fraud signals
HOW TO CONNECT YOUR AI AGENT
Start with MCP tools in 3 steps
Sign Up & Subscribe
Create an account and subscribe to the production APIs your workflow needs, from address lookup and verification to barcode and web extraction tools.
Generate Your MCP Key
Go to AI & MCPin your dashboard and click “Generate MCP Key”. One key unlocks all your subscribed production APIs as native tools for any MCP-compatible AI client.
Connect to Claude or Cursor
Add your MCP config to Claude Desktop, Cursor, or another compatible client. Your AI agent can now run real API actions for validation, lookup, and automation in real time.
MCP Tools for AI Agents
Connect Your AI Agent to Production APIs Through MCP
APITier gives AI agents real tools, real data, and real API actions. Connect Claude, Cursor, Windsurf, and any MCP-compatible AI client to address, verification, barcode, and web extraction APIs with one account and one MCP key.
One Key, All APIs
Generate a single MCP key from your dashboard and connect subscribed APIs to Claude, Cursor, Windsurf, and custom agents without per-service setup.
Real Tools, Real Data
APITier exposes production APIs as native MCP tools so AI agents can validate emails, look up postcodes, decode barcodes, and extract web data in real time.
Works with Claude, Cursor & More
Drop a simple MCP config into Claude Desktop, Cursor, or another compatible client and expose your subscribed APIs as agent tools with no wrapper code.
Subscription-Gated Tools
Tools appear automatically based on your active plan, so your AI agent only gets access to the production APIs you have enabled.
WHY USE APITIER AS AI AGENT INFRASTRUCTURE?
Why teams use APITier for MCP tools and production API actions
Native MCP Tool Support
Every APITier API is exposed as a native MCP tool. Claude, Cursor, and Windsurf can call them directly — no SDK, no wrapper, no boilerplate.
Eliminates AI Hallucinations on Facts
Postcode lookups, VAT validation, and email verification return authoritative live data — AI agents get correct answers instead of guessing.
Zero Integration Code
A small MCP config is all it takes. Your subscribed production APIs appear automatically as tools, and your AI agent decides when to call them.
Performance at Any Scale
Serverless cloud infrastructure handles millions of agent calls with sub-200ms latency — no cold-start penalties for high-volume AI workflows.
Pay for Successful API Usage
You pay only for successful API requests made by your application or AI agent, with plans that scale from individual developers to enterprise teams.
Subscription-Gated Tools
Tools available to your AI agent exactly match your active subscriptions. Upgrade a plan and the new tool appears in your AI setup instantly.
UK PostCode API — Separate Pricing
UK PostCode API Pricing
The UK PostCode API uses its own credit system, separate from the shared credit wallet. Choose Pay As You Go for flexibility or a Subscription for predictable costs.
Option 1
Pay As You Go
Buy bulk lookup credits upfront. Never runs out mid-month — perfect as a fallback for bursty traffic.
Bulk credits — purchase once, use any time
Plans from £8 for 200 lookups
Solid fallback for bursty traffic
Find by Postcode, Address, UDPRN
Address Autosuggest API
Developer portal & API docs
SLA agreement
Option 2
Subscription
Monthly subscription with a higher allowance per £. Best value for steady, high-volume UK address lookups.
Lower per-lookup cost vs PAYG
Monthly subscription — predictable billing
Stripe billing portal + invoices
Ideal for steady, high-volume traffic
Find by Postcode, Address, UDPRN
Address Autosuggest API
Developer portal & API docs
SLA agreement
HOW APITIER POWERS AI AGENT WORKFLOWS
Why APITier fits production AI agent infrastructure
Automate Data Validation Workflows
AI agents automatically validate emails, phone numbers, postcodes, and VAT numbers during onboarding, order processing, and CRM enrichment — using real API actions instead of manual checks.
Ground AI in Trusted Data Sources
UK postcode data from Ordnance Survey & Royal Mail, VAT numbers verified against HMRC — your AI agent works with authoritative data, not guesses.
Ship AI Features Faster
Skip weeks of API research and wiring. Subscribed APITier tools appear in your MCP setup automatically, reducing time from idea to working agent.
Elevate Customer-Facing AI Agents
Build AI assistants that look up real addresses, validate user inputs, and generate barcodes on demand — giving customers instant, accurate responses.
Scale Agent Infrastructure Effortlessly
Production APIs scale automatically with agent traffic. Whether your AI makes 10 or 10 million calls, there is no extra infrastructure to manage.
Works Across Every AI Platform
Claude Desktop, Cursor, Windsurf, VS Code Copilot, and any MCP-compatible tool. One key and one config keep your AI agent stack consistent across platforms.
Production APIs for AI Agents
Browse validation, lookup, conversion, and barcode APIs that can be used directly in your apps or exposed to Claude, Cursor, Windsurf, and custom agents through MCP.
Address and Postcode APIs
Web Extraction and Conversion APIs
Simple, transparent pricing
One Credit Wallet.
Every API & AI Agent.
1 credit = $0.001 — one shared balance across all your APIs and AI Agents. No per-product plans. No surprises.
Monthly
Annual
Free
Free
1,000 credits / month
All APIs & AI Agents
1,000 credits / month
Developer portal
Full API documentation
Community support
Starter
$9
/ month
15,000 credits / month
All APIs & AI Agents
15,000 credits / month
Developer portal
Full API documentation
Email support
Growth
$29
/ month
50,000 credits / month
All APIs & AI Agents
50,000 credits / month
Advanced security controls
SLA agreement
Priority email support
Professional
$79
/ month
150,000 credits / month
All APIs & AI Agents
150,000 credits / month
Advanced security controls
SLA agreement
Dedicated support
Priority processing queue
Business
$199
/ month
450,000 credits / month
All APIs & AI Agents
450,000 credits / month
Advanced security controls
Enhanced SLA
Dedicated support
Custom integration support
Bespoke development options
All plans include access to every API and AI Agent. Credits are shared across products — no per-API quotas. Unused credits on paid plans do not roll over. UK PostCode API has its own separate pricing — see below.
What counts as 1 credit?
Each API call or Agent invocation deducts from your shared credit balance.
| API / Agent | Credits per call |
|---|---|
| Email Validation | 2 credits |
| Phone Validation | 1 credit |
| VAT Number Validation | 1 credit |
| India Pincode Lookup | 1 credit |
| QR Code Generation | 2 credits |
| Barcode Generation | 2 credits |
| Data Format Conversion | 2 credits |
| Web Screenshot (Conversion) | 3 credits |
| Checkout Signals | 5 credits |
| Address Agent — Validate | 40 credits |
| Address Agent — Enrich | 55 credits |
| Business Verify Agent | 50 credits |
| Lead Agent — Validate | 60 credits |
| Director Search Agent | 60 credits |
| KYC Agent — Onboard | 150 credits |
| Company Lookup | 5 credits |
| PSC Lookup | 5 credits |
Example: Growth plan ($29/mo)
50,000 credits / month gets you:
Email validations
25,000
QR code generations
25,000
Web screenshots
16,666
Address Agent calls
1,250
Lead Agent queries
833
Business Verify calls
1,000
Mix and match — your credits work across all APIs and Agents.
Frequently Asked Questions About MCP and AI Agent Tools
What is MCP and how does it relate to APITier?
MCP (Model Context Protocol) is an open standard by Anthropic that lets AI tools like Claude, Cursor, and Windsurf call external APIs as native agent tools. APITier implements MCP so your subscribed APIs — email validation, UK postcode lookup, barcode generation, and more — are available to AI agents out of the box, with no custom integration code.
Which AI tools are compatible with APITier's MCP integration?
Any tool that supports the Model Context Protocol works with APITier. This includes Claude Desktop, Cursor, Windsurf, VS Code with Copilot MCP extensions, and any custom agent built with the Anthropic Agent SDK or compatible frameworks.
How do I connect APITier to Claude Desktop?
1. Log in to your APITier dashboard and go to AI & MCP.
2. Click Generate MCP Key and copy the key.
3. Open Claude Desktop → Settings → Developer → Edit Config and add:"mcpServers": { "apitier": { "command": "npx", "args": ["-y", "@apitier/mcp-server"], "env": { "APITIER_MCP_KEY": "your-key" } } }
4. Restart Claude Desktop. Your subscribed APIs appear as tools automatically.Are API calls made by an AI agent charged the same way?
Yes. Each successful API call counts as one credit, whether it is made by your own code, a REST client, or an AI agent via MCP. Your existing subscription quota covers both.
Does my MCP Key give access to all APITier APIs?
Your MCP Key unlocks only the APIs you are actively subscribed to. If you subscribe to the UK Postcode API, those tools appear in your AI setup. Subscribe to email validation and that tool is added automatically — no key regeneration needed.
Why use APITier APIs in an AI agent instead of letting the AI answer directly?
AI language models can hallucinate factual data — especially postcodes, VAT numbers, phone validity, and email deliverability. APITier APIs return live, authoritative data from official sources (Royal Mail, Ordnance Survey, HMRC). Using them in your agent ensures accuracy where it matters most.
AI & MCP INTEGRATION
How to get API Key?
Register Free (without providing Card Details) with an email and password.
Can I publicly expose my API Key by embedding it in some client-side code?
Yes. Many people choose this route due to faster response times and no server-side code to handle API queries. However, you need to take appropriate measures to limit your API Key so it cannot be misused by others.
Can I get my data in XML (or some other data format)?
Not right now. It's all in JSON. We do not have plans to use other formats.
How to Pay for APITier API Key?
API providers offer subscription plans tailored to the needs of individual developers, startups, and small-to-medium enterprises (SMEs). These subscription plans often provide access to a range of features and usage limits, allowing you to select the plan that best fits your requirements.
Are my credit card payments safe?
Yes, all payment details are sent directly to Stripe. We never see any of this information. Stripe has been audited by a PCI-certified auditor and is certified to PCI Service Provider Level 1. This is the most stringent level of certification available. Stripe link - https://stripe.com
Can I cancel my subscription at anytime?
You can cancel your subscription at any time with our service. We understand that your needs may change, and we want to ensure you have the flexibility to adjust your plan as necessary.
How usage is calculated?
Each API call on the APITier platform count as the use of 1 API credit.
Example -
1. Single Find By Postcode API call, count as 1 credit use
2. Single Address Lookup API call, count as 1 credit use
3. Single Validate Email API call, count as 1 credit useWhat Is APITier?
APITier is an AI agent infrastructure platform that connects AI clients and developer applications to production APIs for verification, address lookup, web extraction, data conversion, and barcode workflows.
How to integrate APITier API?
You can integrate APITier in two ways: call the APIs directly from your app, or connect them as MCP tools for Claude, Cursor, Windsurf, VS Code, and custom AI agents.
Where does the data come from?
We cross-reference Ordnance Survey's and Royal Mail (Postcode Address File) complete list of UK postcodes (code point open) with the latest property sales, council tax register, companies house data, and over twenty other data sources to create a near-complete address database.
Can I save or cache the addresses I receive?
Yes, addresses are public data.
Are you providing support?
Yes, we offer email support for all our customers & even online meetings for our extended license customers.
What's the difference between Basic and Priority support?
Priority support is available 24-hours a day and can give advice on your code issues. Basic support will only provide advice with API issues or responses from our servers.
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No credit card. No setup fees. Real production APIs from the first call.