How to Use the USPS Developer Portal MCP in Claude Code

Q: How do I check rates using USPS Developer Portal and Claude Code?

You create a simple script that invokes calculateinternationalrate. This runs entirely headless, making it ideal for scheduled background jobs or CI/CD pipelines.

Q: Can Claude Code use USPS Developer Portal to validate addresses in scripts?

Yes. You write a command that calls verifyuspsaddress on a list of bad records, automatically cleaning the data and writing it to a clean output file.

Q: Can the USPS Developer Portal help validate mailing locations using Claude Code?

You can use lookupuspscitystate in a script to cross-reference addresses against known ZIP codes. This is excellent for data quality checks before deployment.

Automate shipping rate checks, package tracking, and address validation via Claude Code.

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Connect USPS Developer Portal MCP to Claude Code

Create your Vinkius account to connect USPS Developer Portal to Claude Code 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 Code

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Run Rate Checks in Scripts

You can write a simple shell script that calls `calculate_domestic_rate` for bulk processing. The script takes the output JSON from the tool and pipes it into a CSV file. It's perfect for pre-calculating large batches of shipping costs.

Automate Address Data Preparation

Need to process 1,000 addresses overnight? A script can loop through records, calling `verify_usps_address` and saving the cleaned output. You also use `lookup_usps_zip_code` in a cron job to ensure your database of ZIP codes is current.

Batch Track Packages for CI/CD

Never manually check tracking again. Write a script that takes a list of numbers and iterates through them, calling `track_usps_package`. The final status report gets piped to standard output or an S3 bucket.

Setup guide

Set up USPS Developer Portal MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see usps-developer-portal-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest USPS Developer Portal transactions." It will automatically discover and invoke the available USPS Developer Portal tools.

Terminal

claude mcp add --transport http usps-developer-portal-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

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Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the USPS Developer Portal MCP

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

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

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

Get your connection token →

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Common questions about USPS Developer Portal MCP in Claude Code

You create a simple script that invokes `calculate_international_rate`. This runs entirely headless, making it ideal for scheduled background jobs or CI/CD pipelines.

Yes. You write a command that calls `verify_usps_address` on a list of bad records, automatically cleaning the data and writing it to a clean output file.

It does. You can build robust shell scripts that pull detailed package movement history by calling `track_usps_package_advanced` and logging the full JSON output.

The server touches US street addresses, ZIP codes, tracking numbers, weight metrics, and rate tables.

You can use `lookup_usps_city_state` in a script to cross-reference addresses against known ZIP codes. This is excellent for data quality checks before deployment.

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