How to Use the USPS Developer Portal MCP in Windsurf
Calculate shipping rates, verify addresses, and track packages using Windsurf.
Works with every AI agent you already use
…and any MCP-compatible client
Connect USPS Developer Portal MCP to Windsurf
Create your Vinkius account to connect USPS Developer Portal to Windsurf and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.
Determine Shipping Costs
Need to know how much a package costs? Cascade handles both domestic and international calculations. You just give it the dimensions and destination; the agent runs `calculate_domestic_rate` or `calculate_international_rate`. It returns the final cost so you can move on.
Validate Shipping Destinations
Before calculating anything, make sure the address is real. The tool lets you verify and standardize a US street address using `verify_usps_address`, or find the specific ZIP code for an entire city/state combo via `lookup_usps_city_state`. This saves time on bad data.
Track and Estimate Deliveries
Windsurf can handle two kinds of tracking. First, run `track_usps_package` with a simple number to get status updates. For more depth, use `track_usps_package_advanced` for detailed movements. It also runs `get_delivery_commitments` so you know when the package is actually supposed to arrive.
Set up USPS Developer Portal MCP in Windsurf
Prerequisites
- Windsurf IDE installed (macOS, Windows, or Linux)
- Active Vinkius subscription with a valid endpoint token
- 1
Open MCP configuration
Click the Cascade assistant icon in the sidebar, then click the hammer icon (🔨) at the top of the panel. Select "Configure" to open
~/.codeium/windsurf/mcp_config.json. - 2
Add the USPS Developer Portal MCP
Paste the JSON snippet shown on the right into the
mcpServersobject. Replace[YOUR_TOKEN_HERE]with your endpoint token from cloud.vinkius.com. - 3
Refresh MCPs
Go back to the hammer icon (🔨) in Cascade and click "Refresh". Windsurf will detect the new server. No full restart is needed — the connection is hot-reloaded.
- 4
Verify in Cascade
Start a new Cascade conversation and ask something like "Show my USPS Developer Portal payment history." If connected, Cascade will call the USPS Developer Portal tools directly. You will see a green dot next to the server name in the MCP panel.
{
"mcpServers": {
"usps-developer-portal-mcp": {
"url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
}
}
}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 Windsurf
Use it with your favorite AI tools
Connect this server to Cursor, Claude, VS Code, and more.
Start using the USPS Developer Portal MCP today
We host it, we monitor it, we maintain it. You just paste one token.
