Bring Direct Mail
to Pydantic AI
Create your Vinkius account to connect Poplar to Pydantic AI and start using all 11 AI tools in minutes. Fully managed, enterprise secure, and ready to use without writing a single line of code. No hosting, no server setup — just connect and start using.
GDPR Free for SubscribersCompatible with every major AI agent and IDE
Gemini
What is the Poplar MCP Server?
Connect your Poplar account to any AI agent and take full control of your programmatic direct mail and physical outreach through natural conversation.
What you can do
- Trigger Mailers — Automatically send physical postcards or letters by providing a campaign ID and recipient details.
- Address Standardization — Clean and verify US mailing addresses using Poplar's specialized standardization service.
- Audience Management — List all mailing audiences and add new members via email or physical address.
- Suppression Control — Add recipients to the global 'Do Not Mail' list to manage opt-outs and compliance.
- Campaign Visibility — List all active direct mail campaigns and inspect available creatives.
- Delivery Tracking — Monitor the production and delivery status of specific mail pieces in real-time.
- Attribution Reporting — Submit customer orders back to Poplar to track the ROI of your physical mail campaigns.
How it works
- Subscribe to this server
- Enter your Poplar Access Token (found in API Settings)
- Start sending physical mail from Claude, Cursor, or any MCP-compatible client
No more manual uploading of address lists. Your AI assistant acts as a dedicated Direct Mail Coordinator or Growth Marketing Specialist.
Who is this for?
- Growth Marketers — automate high-touch physical follow-ups for high-value leads or abandoned carts.
- Retention Managers — send 'Win-back' postcards to churning customers directly from the CRM flow.
- E-commerce Owners — track the effectiveness of direct mail by reporting transactions back for attribution.
Built-in capabilities (11)
Add a recipient to a specific audience list
Add a recipient to the global "Do Not Mail" list
Get information about the authenticated account
Check the production and delivery status of a specific mailer
List all mailing audiences in your account
List account billing and invoice data
List all uploaded mailer designs/creatives
List all direct mail campaigns
Report a customer order back to Poplar for attribution tracking
Pass fields like address_line1, city, state, postal_code. Clean and standardize a US mailing address
Requires "campaign_id" and "recipient_json" (address details). Optional "merge_tags_json" for dynamic content. Trigger a physical mailer (postcard, letter) for a campaign
Why Pydantic AI?
Pydantic AI validates every Poplar tool response against typed schemas, catching data inconsistencies at build time. Connect 11 tools through Vinkius and switch between OpenAI, Anthropic, or Gemini without changing your integration code. full type safety, structured output guarantees, and dependency injection for testable agents.
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Full type safety: every MCP tool response is validated against Pydantic models, catching data inconsistencies before they reach your application
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Model-agnostic architecture. switch between OpenAI, Anthropic, or Gemini without changing your Poplar integration code
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Structured output guarantee: Pydantic AI ensures tool results conform to defined schemas, eliminating runtime type errors
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Dependency injection system cleanly separates your Poplar connection logic from agent behavior for testable, maintainable code
Poplar in Pydantic AI
Why run Poplar with Vinkius?
The Poplar connection runs on our fully managed, secure cloud infrastructure. We handle the hosting, maintenance, and security so you don't have to deal with servers or code. All 11 tools are ready to work instantly without any complex setup.
You stay in complete control of your data. Your AI only accesses the information you approve, keeping your sensitive passwords and private details completely safe. Plus, with automatic optimizations, your AI works faster and more efficiently.
* Every connection is hosted and maintained by Vinkius. We handle the security, updates, and infrastructure so you don't have to write code or manage servers. See our infrastructure
Over 4,000 integrations ready for AI agents
Explore a vast library of pre-built integrations, optimized and ready to deploy.
Connect securely in under 30 seconds
Generate tokens to authenticate and link external services in a single step.
Complete visibility into every agent action
Audit live requests, latency, success rates, and active security compliance policies.
Optimize spending and track token ROI
Analyze real-time token consumption and cost metrics detailed by connection.
Explore our live AI Agents Analytics dashboard to see it all working
This dashboard is included when you connect Poplar using Vinkius. You will never be left in the dark about what your AI agents are doing with your tools.
Poplar and 4,000+ other AI tools. No hosting, no code, ready to use.
Professionals who connect Poplar to Pydantic AI through Vinkius don't need to write code, manage servers, or worry about security. Everything is pre-configured, secure, and runs automatically in the background.
Raw MCP | Vinkius | |
|---|---|---|
| Ready-to-use MCPs | Find and configure each manually | 4,000+ MCPs ready to use |
| Connection Setup | Manual coding & server setup | 1-click instant connection |
| Server Hosting | You host it yourself (needs 24/7 uptime) | 100% hosted & managed by Vinkius |
| Security & Privacy | Stored in plaintext config files | Bank-grade encrypted vault |
| Activity Visibility | Blind execution (no logs or tracking) | Live dashboard with real-time logs |
| Cost Control | Runaway AI token spend risk | Automatic budget limits |
| Revoking Access | Must delete files or code to stop | 1-click disconnect button |
How Vinkius secures
Poplar for Pydantic AI
Every request between Pydantic AI and Poplar is protected by our secure gateway. We automatically keep your sensitive data private, prevent unauthorized access, and let you disconnect instantly at any time.
Frequently asked questions
How do I get my Poplar Access Token?
Log in to your Poplar account and navigate to the API Settings or Developer section. You will find your Access Token there. Use a Test Token for development and a Production Token for live mailings.
Can I standardize non-US addresses?
No, Poplar's address standardization service is specifically designed for US addresses only. For international mailing, ensure your addresses are pre-formatted correctly.
How can I check if a mailer has been delivered?
Use the get_mailer_status tool with the unique mailer ID. It will return the current status, including production phases and the final USPS delivery confirmation when available.
Is the integration secure for customer addresses?
Absolutely. The integration uses official Poplar Bearer tokens over HTTPS. Your credentials and customer data are encrypted and stored securely within the Vinkius Cloud infrastructure.
How does Pydantic AI discover MCP tools?
Create an MCPServerHTTP instance with the server URL. Pydantic AI connects, discovers all tools, and generates typed Python interfaces automatically.
Does Pydantic AI validate MCP tool responses?
Yes. When you define result types as Pydantic models, every tool response is validated against the schema. Invalid data raises a clear error instead of silently corrupting your pipeline.
Can I switch LLM providers without changing MCP code?
Absolutely. Pydantic AI abstracts the model layer. your Poplar MCP integration works identically with OpenAI, Anthropic, Google, or any supported provider.
MCPServerHTTP not found
Update: pip install --upgrade pydantic-ai
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