developer-toolsapi_key

Addresszen

AddressZen provides address autocomplete and verification services, offering real-time address suggestions and validation to ensure accurate and deliverable addresses.

Verdict

Addresszen validates and autocompletes US postal addresses inside Switchy. When your team @mentions it, the MCP exposes two tools: one checks if your API key is active, the other resolves a suggestion ID into a full formatted address. This matters most for teams building forms, onboarding flows, or data-cleaning workflows where accurate address entry saves time downstream. The MCP assumes you already have suggestion IDs from Addresszen's autocomplete endpoint — it doesn't generate suggestions itself, only completes them. If your workflow needs the full autocomplete-to-resolution cycle, you'll call their API separately first.

Common use cases

Validate API key before batch address jobs
Resolve autocomplete IDs into shipping labels
Clean CRM address data in bulk
Verify address format for compliance checks

Integration

Vendor: Addresszen
Category: developer-tools
Auth: API_KEY
Tools: 2
Composio slug: addresszen

Tools

Key Availability
Tool to get public information on an api key, including whether it is currently usable. use when you need to verify that a key is valid and available before making further api requests.
Resolve Address USA
Tool to resolve an address autocompletion by its address id and return the full address in us format. use after obtaining an address suggestion id from the autocomplete endpoint.

Setup

Setup guide

11. Open your Switchy workspace and navigate to Settings > Integrations > MCP Servers. 2. Click 'Add MCP Server' and select Addresszen from the catalog. 3. You'll be prompted to paste an Addresszen API key — get this from your Addresszen dashboard under API Keys. 4. Paste the key into the form and click 'Connect'. 5. Switchy will test the connection by calling the Key Availability tool; if the key is valid, you'll see a green checkmark. 6. Open any Space and type '@Addresszen check my key status' to confirm the MCP responds. 7. To resolve an address, you'll need a suggestion ID from Addresszen's autocomplete API; once you have it, prompt '@Addresszen resolve address ID abc123' and the MCP will return the full formatted address.

What teammates see: by default, memories from Addresszen are scoped to the Space (PROJECT visibility) - you can mark any memory PRIVATE or share it ORG-wide.

Works well with

Top models

Compatibility data appears once enough Spaces have used this MCP together with a given model.

How Switchy teams use it

Not enough Spaces yet to publish anonymised usage stats (we require ≥ 50 Spaces per week).

Starter prompts

Check Key Status

@Addresszen check whether my API key is currently valid and available for use

Open in a Space →

Resolve Single Address

@Addresszen resolve the address with suggestion ID 7f3e9a12 and return the full formatted result

Open in a Space →

Batch Address Validation

@Addresszen first confirm my key is active, then resolve these suggestion IDs: 4b8c21, 9d7f3a, 2e6g8h

Open in a Space →

Format Check Before Export

@Addresszen resolve suggestion ID k9m2p5 and confirm the address includes street, city, state, and ZIP+4

Open in a Space →

Troubleshoot Failed Resolution

@Addresszen verify my key status, then try resolving suggestion ID x3y7z1 and explain any errors

Open in a Space →

Example outputs

Illustrative - representative of the model's voice and quality, not literal recordings.

Prompt

@addresszen verify my API key is still active and check how many requests I have left this month

Output

Your Addresszen API key is active and valid. Current usage shows 847 requests consumed out of your 10,000 monthly allocation, leaving 9,153 requests available. The key has no restrictions and is authorized for all endpoint access. Rate limit status: healthy, with no throttling currently applied to your account.

Notes

This example uses the Key Availability tool to surface quota and health info before you burn requests on address lookups. Useful for monitoring usage in automated workflows. Note that quota details depend on your Addresszen plan tier—starter plans may show lower limits.

Prompt

@addresszen I have address ID 'addr_2kX9mP4' from an autocomplete—give me the full validated US address with all components

Output

Resolved address for ID addr_2kX9mP4: 1600 Amphitheatre Parkway, Mountain View, CA 94043. Components: street number 1600, route 'Amphitheatre Parkway', city 'Mountain View', state 'California' (CA), ZIP code 94043, county 'Santa Clara'. Coordinates: 37.4220° N, 122.0841° W. Address validated against USPS standards.

Notes

This example demonstrates the Resolve Address USA tool, which takes a suggestion ID from Addresszen's autocomplete API and returns structured, validated address data. You must obtain the address ID from a prior autocomplete call—this tool does not perform searches. Useful for form validation or CRM enrichment workflows.

Prompt

@addresszen check if my key is valid, then resolve address ID 'addr_7hG2nQ8' and format it as a single-line shipping label

Output

API key verified: active with 6,204 requests remaining. Address resolved: 350 Fifth Avenue, New York, NY 10118 (Empire State Building). Formatted for shipping label: '350 Fifth Avenue, New York, NY 10118, USA'. This address is validated and delivery-ready per USPS standards.

Notes

This synthesis example chains the Key Availability check with the Resolve Address tool, then asks the AI to reformat output for a specific use case (shipping labels). Demonstrates how Addresszen's structured data pairs with AI reasoning for downstream tasks. Both tools run in sequence—expect ~2-3 seconds total latency for the round trip.

Use-case deep-dives

Onboarding form address validation

When Addresszen fixes sign-up drop-off for SaaS teams

A 6-person SaaS startup sees 18% of trial sign-ups abandon at the shipping address field because users mistype street names or can't find their apartment complex in a dropdown. Addresszen's autocomplete tool surfaces real USPS addresses as users type, then the resolve tool fills the full standardized format on selection. This MCP is the right call if your product ships physical goods or needs billing addresses for US customers and you're building the form logic in an AI workflow. The two-tool setup is lean enough to drop into a Switchy agent that pre-fills Stripe or Shopify. Skip it if you're international-first or already have address validation baked into your payment processor.

Customer support address lookup

Addresszen for support agents chasing incomplete tickets

A 12-person e-commerce support team spends 40 minutes per day manually fixing customer-entered addresses that failed delivery. An agent gets a ticket with '123 Main St' and no city—Addresszen's autocomplete returns the three likeliest matches, the agent picks one, and the resolve tool writes the canonical USPS format back into Zendesk. This MCP works if your support volume is under 200 tickets/day and most address issues are typos, not fraud. The key-availability tool lets you confirm the API quota before a batch run. If you're debugging thousands of addresses weekly or need international coverage, you'll hit the rate limit or need a different vendor.

Marketing list geocoding for local campaigns

When Addresszen cleans lead data for regional targeting

A 4-person marketing team at a home-services company imports 800 leads from a trade show spreadsheet where half the addresses are missing ZIP codes or have old street names. They run a Switchy agent that autocompletes each partial address, resolves the full USPS record, and tags leads by metro area for a direct-mail campaign. Addresszen is the right fit if your list is US-only, under 5,000 records per batch, and you're okay with API-key auth in a shared workspace. The two-tool flow is simple enough that non-technical marketers can trigger it. If your list is larger or spans Canada and Mexico, you need a bulk geocoding service with OAuth and broader coverage.

Frequently asked

What does the Addresszen MCP do in Switchy?

It validates API keys and resolves US address autocomplete suggestions into full formatted addresses. Your AI agents can check if an Addresszen key is still active, then turn partial address inputs into standardised street, city, state, ZIP records. Useful for workflows that collect shipping or billing addresses and need real-time validation without leaving the chat.

Do I need admin access to connect Addresszen?

No. You only need an Addresszen API key with read permissions. Paste it into Switchy's MCP settings and the connection is live. There's no OAuth flow or account-level approval step. Anyone on your team with a valid key can connect their own instance if your Addresszen plan allows multiple keys.

Can the Addresszen MCP write or update addresses in my database?

No. It only reads from Addresszen's autocomplete API to resolve suggestion IDs into full addresses and checks key validity. If you need to store the resolved address, your agent must pass it to a separate database tool like Postgres MCP or call your own API. Addresszen itself doesn't persist data.

Why use this MCP instead of calling Addresszen's API directly?

Your AI agents can validate addresses mid-conversation without you writing integration code or managing HTTP requests. The MCP handles auth and response parsing, so the agent just asks for an address and gets structured JSON back. Faster to prototype, easier to maintain than custom scripts in every workflow.

Does connecting Addresszen count against my Switchy plan limits?

The MCP connection itself is free. Addresszen API calls count against your Addresszen plan's quota, not Switchy's. If your team runs many address lookups, monitor usage in your Addresszen dashboard. Switchy doesn't meter or throttle the requests the MCP makes on your behalf.