How do I get an EasyPost API Key?

Log in to your EasyPost dashboard, navigate to **Account Settings > API Keys**, and you can find your Live and Test API keys there. Ensure you use the appropriate key for the data you want to access.

Can the agent purchase shipping labels?

This integration currently focuses on listing and auditing shipments, trackers, and carrier accounts. Purchasing labels or generating labels should be managed via the EasyPost web portal or specific creation API endpoints.

Which carriers are supported?

EasyPost supports over 100 carriers globally, including USPS, FedEx, UPS, DHL, and many regional carriers. You can use the list_carrier_accounts tool to see which ones are connected to your account.

EasyPost MCP Server for LangChain 10 tools — connect in under 2 minutes

Name: EasyPost
Availability: InStock
Author: Vinkius

python.langchain.com/docs/integrations/tools/mcp

Built by Vinkius GDPR 10 Tools Framework

LangChain is the leading Python framework for composable LLM applications. Connect EasyPost through Vinkius and LangChain agents can call every tool natively. combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    async with MultiServerMCPClient({
        "easypost": {
            "transport": "streamable_http",
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
        }
    }) as client:
        tools = client.get_tools()
        agent = create_react_agent(
            ChatOpenAI(model="gpt-4o"),
            tools,
        )
        response = await agent.ainvoke({
            "messages": [{
                "role": "user",
                "content": "Using EasyPost, show me what tools are available.",
            }]
        })
        print(response["messages"][-1].content)

asyncio.run(main())

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Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* 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 EasyPost MCP Server

Integrate EasyPost, the leading shipping API for e-commerce, directly into your AI workflow. Manage your outbound shipments and carrier rates, track packages in real-time with detailed event logs, monitor your connected carrier accounts (UPS, FedEx, USPS, etc.), and oversee your shipping addresses using natural language.

LangChain's ecosystem of 500+ components combines seamlessly with EasyPost through native MCP adapters. Connect 10 tools via Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures. with LangSmith tracing giving full visibility into every tool call, latency, and token cost.

What you can do

Shipment Oversight — List and retrieve detailed information, rates, and carrier options for all your logistics shipments.
Real-time Tracking — Monitor active trackers, resolving real-time transit statuses, checkpoint events, and estimated delivery dates.
Carrier Management — Access and monitor all connected carrier accounts, verifying active service capability boundaries across your fleet.
Delivery Auditing — Retrieve high-level summaries of shipment activity, success rates, and identify packages currently in transit.

The EasyPost MCP Server exposes 10 tools through the Vinkius. Connect it to LangChain 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 EasyPost to LangChain via MCP

Follow these steps to integrate the EasyPost MCP Server with LangChain.

Install dependencies

Run pip install langchain langchain-mcp-adapters langgraph langchain-openai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save the code and run python agent.py

Explore tools

The agent discovers 10 tools from EasyPost via MCP

Why Use LangChain with the EasyPost MCP Server

LangChain provides unique advantages when paired with EasyPost through the Model Context Protocol.

The largest ecosystem of integrations, chains, and agents. combine EasyPost MCP tools with 500+ LangChain components

Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step

LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging

Memory and conversation persistence let agents maintain context across EasyPost queries for multi-turn workflows

EasyPost + LangChain Use Cases

Practical scenarios where LangChain combined with the EasyPost MCP Server delivers measurable value.

RAG with live data: combine EasyPost tool results with vector store retrievals for answers grounded in both real-time and historical data

Autonomous research agents: LangChain agents query EasyPost, synthesize findings, and generate comprehensive research reports

Multi-tool orchestration: chain EasyPost tools with web scrapers, databases, and calculators in a single agent run

Production monitoring: use LangSmith to trace every EasyPost tool call, measure latency, and optimize your agent's performance

EasyPost MCP Tools for LangChain (10)

These 10 tools become available when you connect EasyPost to LangChain via MCP:

get_easypost_account_metadata

Retrieve metadata and usage limits for your EasyPost account

get_shipment_details

Get detailed information and rates for a specific shipment

get_tracking_details

Get real-time tracking events and status for a specific tracker

list_active_trackers

List all active tracking objects in your account

list_carrier_accounts

List all connected carrier accounts (e.g. UPS, FedEx, USPS)

list_in_transit_packages

Identify shipments that are currently in transit with a carrier

list_latest_shipments

Identify the most recently created shipments

list_shipping_shipments

List all shipments created in your EasyPost account

quick_delivery_health_audit

Retrieve a high-level summary of shipment activity and delivery success rates

search_by_tracking_code

Search for a tracker using a specific tracking code

Example Prompts for EasyPost in LangChain

Ready-to-use prompts you can give your LangChain agent to start working with EasyPost immediately.

"List all active package trackers."

"Show me the details for shipment 'shp_998877'."

"Which carrier accounts are connected to my account?"

Troubleshooting EasyPost MCP Server with LangChain

Common issues when connecting EasyPost to LangChain through the Vinkius, and how to resolve them.

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

EasyPost + LangChain FAQ

Common questions about integrating EasyPost MCP Server with LangChain.

How does LangChain connect to MCP servers?

Use langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.

Which LangChain agent types work with MCP?

All agent types including ReAct, OpenAI Functions, and custom agents work with MCP tools. The tools appear as standard LangChain tools after the adapter wraps them.