USPS Developer Portal MCP Server for Mastra AI 8 tools — connect in under 2 minutes
Mastra AI is a TypeScript-native agent framework built for modern web stacks. Connect USPS Developer Portal through the Vinkius and Mastra agents discover all tools automatically — type-safe, streaming-ready, and deployable anywhere Node.js runs.
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Vinkius supports streamable HTTP and SSE.
import { Agent } from "@mastra/core/agent";
import { createMCPClient } from "@mastra/mcp";
import { openai } from "@ai-sdk/openai";
async function main() {
// Your Vinkius token — get it at cloud.vinkius.com
const mcpClient = await createMCPClient({
servers: {
"usps-developer-portal": {
url: "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
},
},
});
const tools = await mcpClient.getTools();
const agent = new Agent({
name: "USPS Developer Portal Agent",
instructions:
"You help users interact with USPS Developer Portal " +
"using 8 tools.",
model: openai("gpt-4o"),
tools,
});
const result = await agent.generate(
"What can I do with USPS Developer Portal?"
);
console.log(result.text);
}
main();
* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure
About USPS Developer Portal MCP Server
Empower your AI agent to orchestrate your entire postal logistics and address auditing workflow with the USPS Developer Portal, the official source for United States Postal Service data. By connecting USPS Web Tools to your agent, you transform complex shipping tasks into a natural conversation. Your agent can instantly verify addresses, audit package tracking statuses, and retrieve ZIP code metadata without you ever touching a shipping portal. Whether you are managing e-commerce deliveries or conducting regional address audits, your agent acts as a real-time logistics consultant, ensuring your data is always verified and precise.
Mastra's agent abstraction provides a clean separation between LLM logic and USPS Developer Portal tool infrastructure. Connect 8 tools through the Vinkius and use Mastra's built-in workflow engine to chain tool calls with conditional logic, retries, and parallel execution — deployable to any Node.js host in one command.
What you can do
- Address Auditing — Standardize and verify United States addresses to ensure your shipping metadata is always grounded in official USPS records.
- Advanced Tracking Control — Track real-time package statuses and access granular facility-level tracking events instantly.
- ZIP Code & Routing Discovery — Cross-reference ZIP codes with city/state pairs to understand the geographic reach of your logistics.
- Domestic & International Rates — Accurately calculate the real-time cost of shipping across various mail classes, weights, and global destinations.
- Service Delays & Commitments — Query live delivery commitments by mail class to accurately orchestrate e-commerce fulfillment.
The USPS Developer Portal MCP Server exposes 8 tools through the Vinkius. Connect it to Mastra AI in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.
How to Connect USPS Developer Portal to Mastra AI via MCP
Follow these steps to integrate the USPS Developer Portal MCP Server with Mastra AI.
Install dependencies
Run npm install @mastra/core @mastra/mcp @ai-sdk/openai
Replace the token
Replace [YOUR_TOKEN_HERE] with your Vinkius token
Run the agent
Save to agent.ts and run with npx tsx agent.ts
Explore tools
Mastra discovers 8 tools from USPS Developer Portal via MCP
Why Use Mastra AI with the USPS Developer Portal MCP Server
Mastra AI provides unique advantages when paired with USPS Developer Portal through the Model Context Protocol.
Mastra's agent abstraction provides a clean separation between LLM logic and tool infrastructure — add USPS Developer Portal without touching business code
Built-in workflow engine chains MCP tool calls with conditional logic, retries, and parallel execution for complex automation
TypeScript-native: full type inference for every USPS Developer Portal tool response with IDE autocomplete and compile-time checks
One-command deployment to any Node.js host — Vercel, Railway, Fly.io, or your own infrastructure
USPS Developer Portal + Mastra AI Use Cases
Practical scenarios where Mastra AI combined with the USPS Developer Portal MCP Server delivers measurable value.
Automated workflows: build multi-step agents that query USPS Developer Portal, process results, and trigger downstream actions in a typed pipeline
SaaS integrations: embed USPS Developer Portal as a first-class tool in your product's AI features with Mastra's clean agent API
Background jobs: schedule Mastra agents to query USPS Developer Portal on a cron and store results in your database automatically
Multi-agent systems: create specialist agents that collaborate using USPS Developer Portal tools alongside other MCP servers
USPS Developer Portal MCP Tools for Mastra AI (8)
These 8 tools become available when you connect USPS Developer Portal to Mastra AI via MCP:
calculate_domestic_rate
Calculate USPS domestic shipping rates
calculate_international_rate
Calculate USPS international shipping rates
get_delivery_commitments
Get USPS service delivery commitments and estimates
lookup_usps_city_state
Look up the city and state for a ZIP code
lookup_usps_zip_code
Look up the exact ZIP code for a specific US address
track_usps_package
Track a USPS package using a tracking number
track_usps_package_advanced
Get advanced tracking information for a USPS package
verify_usps_address
Verify and standardize a US address using USPS Web Tools
Example Prompts for USPS Developer Portal in Mastra AI
Ready-to-use prompts you can give your Mastra AI agent to start working with USPS Developer Portal immediately.
"Verify address '1600 Pennsylvania Avenue NW, Washington, DC 20500' using USPS."
"Track my package with tracking number '9400100000000000000000'."
"Lookup ZIP code for 'Seattle, WA'."
Troubleshooting USPS Developer Portal MCP Server with Mastra AI
Common issues when connecting USPS Developer Portal to Mastra AI through the Vinkius, and how to resolve them.
createMCPClient not exported
npm install @mastra/mcpUSPS Developer Portal + Mastra AI FAQ
Common questions about integrating USPS Developer Portal MCP Server with Mastra AI.
How does Mastra AI connect to MCP servers?
MCPClient with the server URL and pass it to your agent. Mastra discovers all tools and makes them available with full TypeScript types.Can Mastra agents use tools from multiple servers?
Does Mastra support workflow orchestration?
Connect USPS Developer Portal with your favorite client
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Connect USPS Developer Portal to Mastra AI
Get your token, paste the configuration, and start using 8 tools in under 2 minutes. No API key management needed.