How to Use the USPS Developer Portal MCP in Claude

Q: How do I check rates using the USPS Developer Portal with Claude Desktop?

You use the calculatedomesticrate tool. Just tell your agent client what kind of package and where it's going, and it returns live pricing data.

Q: Can I verify an address using the USPS Developer Portal with Claude Desktop?

Yep. You run verifyuspsaddress. It takes a rough address string and spits out a fully standardized version that USPS accepts, saving you time.

Q: What is the best way to track a package using the USPS Developer Portal with Claude Desktop?

Use trackuspspackage first. If you need granular details beyond the basic status, run trackuspspackageadvanced for a deeper look.

Q: Does the USPS Developer Portal handle international rates with Claude Desktop?

Absolutely. The calculateinternationalrate tool handles those shipments, making it easy to quote global customers directly within your chat interface.

Get live USPS rates, tracking, and address data right inside your Claude Desktop app.

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Create your Vinkius account to connect USPS Developer Portal to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup USPS Developer Portal with Claude Desktop

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Calculate Shipment Rates with the MCP Server

The `calculate_domestic_rate` tool figures out what a standard US shipment costs. You just input the package details, and it spits out the current rate. The `calculate_international_rate` tool handles shipments outside the US. It gives you accurate pricing for global mail, which is perfect when you're coordinating with international partners.

Verify Addresses and ZIP Codes

Need to know if an address is right? Run `verify_usps_address` to standardize any US mailing location. It checks the format and ensures everything matches USPS standards. You can also use `lookup_usps_zip_code` if you only have a physical street address, or `lookup_usps_city_state` if you just need the city/state for a specific ZIP code.

Track Packages and Delivery Estimates

Tracking is simple. Use `track_usps_package` with any tracking number to see where the mail is right now. For more detail, run `track_usps_package_advanced`. Plus, `get_delivery_commitments` gives you an estimate of when USPS expects service delivery, so you can set realistic expectations for your clients.

Setup guide

Set up USPS Developer Portal MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The USPS Developer Portal MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the USPS Developer Portal MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under usps-developer-portal-mcp.

json

{
  "mcpServers": {
    "usps-developer-portal-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by USPS Web Tools. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about USPS Developer Portal MCP in Claude Desktop

You use the `calculate_domestic_rate` tool. Just tell your agent client what kind of package and where it's going, and it returns live pricing data.

Yep. You run `verify_usps_address`. It takes a rough address string and spits out a fully standardized version that USPS accepts, saving you time.

Use `track_usps_package` first. If you need granular details beyond the basic status, run `track_usps_package_advanced` for a deeper look.

Absolutely. The `calculate_international_rate` tool handles those shipments, making it easy to quote global customers directly within your chat interface.

The server touches service delivery commitments and estimates. The `get_delivery_commitments` tool provides this specific time-based data.

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