How to Use the USPS Developer Portal MCP in OpenAI Agents SDK

Q: How do I check delivery estimates with the USPS Developer Portal and OpenAI Agents SDK?

You use getdeliverycommitments. The agent accepts service types and locations, returning estimated commitment dates. Since this is running within your OpenAI Agents SDK setup, you'll get reliable execution logging for compliance.

Q: Can the OpenAI Agents SDK track packages from the USPS Developer Portal?

Yes. The agent exposes trackuspspackage and trackuspspackageadvanced. You just pass it a tracking number, and the agent pulls the full status history directly.

Audit USPS mail, calculate rates, and track packages using your OpenAI Agents SDK.

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Connect USPS Developer Portal MCP to OpenAI Agents SDK

Create your Vinkius account to connect USPS Developer Portal to OpenAI Agents SDK 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 OpenAI Agents SDK

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Calculate Shipping Costs with the MCP Server

Your agent runs `calculate_domestic_rate` or `calculate_international_rate`. It sends dimensions and origin/destination data, and immediately returns current USPS rates for shipping. This tool is designed for production environments. Because you're using the OpenAI Agents SDK, your agent can hand off to specialized modules that handle complex rate matrices while maintaining a full trace on the OpenAI dashboard.

Standardize Addresses and ZIP Codes

Need to make sure an address is correct? The `verify_usps_address` tool takes raw input and standardizes it using USPS Web Tools. This confirms if a US address is valid before you try to ship anything. When combined with the `lookup_usps_zip_code` function, your agent can validate an entire mailing list batch, ensuring data quality upfront. The SDK's guardrails prevent invalid addresses from ever reaching downstream services.

Full Package Tracking History

You can check a package's status using `track_usps_package`. Simply feed it the tracking number, and your agent pulls the current location and last scan event. For deep dives, use `track_usps_package_advanced`. This gives you more than just 'in transit'; it provides detailed history points. The built-in tracing means you'll know exactly which step in your production flow pulled this data.

Setup guide

Set up USPS Developer Portal MCP in OpenAI Agents SDK

Prerequisites

Python 3.10+ installed
openai-agents package (pip install openai-agents)
Active Vinkius subscription with a valid endpoint token

1

Install the SDK

Run pip install openai-agents to install the OpenAI Agents SDK. The MCP integration is built-in — no extra dependencies needed.
2

Connect via SSE transport

Use MCPServerSse with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. The SDK auto-discovers all USPS Developer Portal tools at runtime.
3

Create your Agent

Pass the MCP to Agent(mcp_servers=[server]). The agent receives USPS Developer Portal tools as native definitions — JSON schemas resolve automatically.
4

Run the agent

Call Runner.run(agent, prompt) to execute. The agent invokes the appropriate USPS Developer Portal tools and returns structured results. Copy the full example on the right to get started.

agent.py

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerSse

async def main():
    async with MCPServerSse(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as server:
        agent = Agent(
            name="USPS Developer Portal Agent",
            instructions="You have access to USPS Developer Portal tools.",
            mcp_servers=[server],
        )
        result = await Runner.run(agent, "List recent transactions")
        print(result.final_output)

asyncio.run(main())

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Common questions about USPS Developer Portal MCP in OpenAI Agents SDK

You use `get_delivery_commitments`. The agent accepts service types and locations, returning estimated commitment dates. Since this is running within your OpenAI Agents SDK setup, you'll get reliable execution logging for compliance.

The server handles address verification and standardization using `verify_usps_address`. It confirms that a given US address is correct according to federal standards, making sure your shipping workflows are accurate.

Yes. The agent exposes `track_usps_package` and `track_usps_package_advanced`. You just pass it a tracking number, and the agent pulls the full status history directly.

Yes. The connection relies on your endpoint token for authentication. Since you're running this in a production context with the OpenAI Agents SDK, you benefit from built-in guardrails that validate actions before they execute.

The server touches address components (street, city, state), ZIP codes, and tracking numbers. The agent ensures these pieces of data pass validation checks before any rate calculation or lookup occurs.

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