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How to connect Postgrid verify to Claude

Connect Claude Web, Desktop and Cowork to Postgrid verify MCP. Verify a single us mailing address, standardize a batch of customer addresses, and more using natural language, with authentication handled for you.

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Postgrid verify is an API that autocompletes, verifies, and standardizes postal addresses in real time. It helps reduce failed deliveries and ensures address quality for your business.

12 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Postgrid verify account to Claude via Composio Connect, enabling it to verify a single US mailing address, standardize a batch of customer addresses, autocomplete address based on partial input, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Postgrid verify with

OpenAI Agents SDKClaude Agent SDKClaude CodeCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Postgrid verify to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Postgrid verify account

Back in Claude, ask it to connect to Postgrid verify or give it any Postgrid verify-related task.

For example, ask Claude to:

  • "Verify a single US mailing address"
  • "Standardize a batch of customer addresses"
  • "Autocomplete address based on partial input"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Postgrid verify account is ready to use.

What is the Postgrid verify Claude Connector, and what's possible with it?

The Postgrid verify MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Postgrid verify account. It provides structured and secure access to address verification and standardization services, so your agent can autocomplete addresses, validate locations, perform batch verifications, and standardize address formats automatically on your behalf.

  • Real-time address autocomplete: Instantly suggest and complete address fields as users type, reducing errors and speeding up data entry.
  • Single address verification: Allow your agent to check and validate individual addresses for accuracy and deliverability in real time.
  • Batch address verification: Process and validate multiple addresses at once, making bulk operations seamless and efficient.
  • Address standardization: Automatically format and normalize addresses according to postal standards, ensuring consistency across your systems.
  • Error detection and correction: Enable your agent to identify and fix common address entry mistakes, improving overall data quality.

Troubleshooting

1. Why does Claude not use the Composio connector for Postgrid verify?

The connector can show as connected, but Claude must use it in each Postgrid verify conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Postgrid verify again.

2. Why does Claude show an MCP server error before Postgrid verify connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Postgrid verify.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Postgrid verify.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Postgrid verify authorization link not work?

The Composio connector is one server. Your Postgrid verify account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Postgrid verify connection.
  • Composio creates a fresh Postgrid verify authorization link.
  • Open that link in your browser and finish the Postgrid verify sign-in.

4. Why do Postgrid verify actions fail after they worked before?

The Postgrid verify connection can expire or lose permission.

  • Ask Claude to inspect the Postgrid verify connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Postgrid verify account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Postgrid verify.
  • If the action still fails with a permission error, check that the connected account has that permission in Postgrid verify itself.

5. How do I switch to a different Postgrid verify account?

Claude can manage the Postgrid verify connection for you.

  • Ask Claude to disconnect or delete the current Postgrid verify account.
  • Ask Claude to connect Postgrid verify again.
  • Open the new Composio authorization link for Postgrid verify.
  • Sign in with the other Postgrid verify account in the browser.
  • After the account connects, ask Claude to retry the Postgrid verify task.

6. Why is my Postgrid verify connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Postgrid verify connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Postgrid verify tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Postgrid verify.
TOOLS

Supported Tools

Every Postgrid verify action and event your agent gets out of the box.

Autocomplete Address

Tool to autocomplete a partially specified US or Canada address.

Autocomplete International Address

Tool to retrieve complete verified international address data using an ID from the preview endpoint.

Get Autocomplete Previews

Tool to get previews of autocompleted US and Canadian addresses.

Get International Autocomplete Previews

Tool to get previews of autocompleted international addresses.

Get Lookup Info

Tool to retrieve lookup usage information for your PostGrid account.

Lookup City and State from Postal Code

Tool to lookup city and state for a given postal or ZIP code.

Parse Address

Tool to break an address apart into its components.

Suggest Addresses

Tool to find addresses similar to the given address.

Verify Address

Tool to verify and standardize a US or Canadian address.

Batch Verify Addresses with Mixed Format

Tool to verify up to 2000 US and Canada addresses in a single API call.

Verify International Address

Tool to verify and standardize international addresses from 245+ countries.

Batch Verify International Addresses

Tool to verify up to 2000 international addresses in a single API call.

FRAMEWORKS

How to build Postgrid verify MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Postgrid verify MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Postgrid verify MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Postgrid verify MCP with Claude Code

Codex logo

Codex

Use Postgrid verify MCP with Codex

OpenClaw logo

OpenClaw

Use Postgrid verify MCP with OpenClaw

Hermes logo

Hermes

Use Postgrid verify MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Postgrid verify MCP with Atomic Agent

Google ADK logo

Google ADK

Use Postgrid verify MCP with Google ADK

LangChain logo

LangChain

Use Postgrid verify MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Postgrid verify MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Postgrid verify MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Postgrid verify MCP with LlamaIndex

CrewAI logo

CrewAI

Use Postgrid verify MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Postgrid verify MCP with Pydantic AI

AutoGen logo

AutoGen

Use Postgrid verify MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Postgrid verify MCP server, the agents and LLMs can only access a fixed set of Postgrid verify tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Postgrid verify and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Postgrid verify tools.

Yes, absolutely. You can configure which Postgrid verify scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Postgrid verify data and credentials are handled as safely as possible.

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