.DkNUKaKx_ZLAT4m.webp?dpl=dpl_HVfVPeQzseDmrTrsmjxejrJCTv4D){kind=small}
Connectors / Marketing · HTTP Connector
Automate Lob with Tray.ai
Create a postcard, create a letter and create a check in Lob. Connect Lob to the rest of your marketing stack with Tray.ai.
Thanks — someone from our team will be in touch soon.
What can you do with Lob on Tray.ai?
Lob is a direct mail and address verification service that prints and posts letters, postcards, self-mailers and checks from API calls, and checks US and international addresses. Tray.ai connects to Lob through the HTTP Connector, so your workflows can call the Lob API alongside the rest of your stack.
- Create a postcard to welcome each new customer added to your CRM.
- Create a letter for overdue accounts flagged by your billing system.
- Create a check for approved vendor payments from your accounting system.
- Cancel a postcard if the customer unsubscribes before it is mailed.
- Connects through
- HTTP Connector
- Authentication
- Basic authentication
- Base URL
- https://api.lob.com/v1
Set it up
Connect Lob to Tray.ai
Each step uses Lob's own API details, from its documentation.
Step 1
Save Lob's username and password
Save the credentials Lob gives you as a Tray.ai authentication. The HTTP Client sends them as basic auth. They stay out of the workflow and out of the logs.
Step 2
Point the HTTP Client at the API
Add an HTTP Client step and use https://api.lob.com/v1 as the base URL. Or paste a cURL example from Lob's API docs, and Tray.ai fills in the method, URL, and headers.
Step 3
Start with “List postcards”
It's one of 23 documented actions, under Postcards. The response comes back as data the next step can map into your other apps.
Step 4
Hand it to an AI agent
Wrap “Create a postcard” and “Retrieve a postcard” in workflows, and Tray.ai's Agent Gateway for MCP publishes them as governed tools Claude and other AI agents can call.
What the Lob API covers
6 resources and 23 documented actions, each one a call the HTTP Connector can make from a Tray.ai workflow. Connecting it takes a few clicks: here's how.
Postcards
- Create a postcard
- List postcards
- Retrieve a postcard
- Cancel a postcard
Letters
- Create a letter
- List letters
- Retrieve a letter
- Cancel a letter
Checks
- Create a check
- List checks
- Retrieve a check
- Cancel a check
Addresses
- Create an address
- List addresses
- Retrieve an address
- Delete an address
Address verifications
- Verify a US address
- Verify an international address
- Autocomplete a US address
Templates
- Create a template
- List templates
- Update a template
- Delete a template
Checked against Lob's own documentation on 2026-10-22
How Tray.ai makes this work
Lob plugs into the whole Tray.ai platform
Intelligent Integration
Integrate and automate across 9,000+ apps, databases, APIs, and services with visual workflows, error handling, and observability.
Learn more →Agent Builder
Build AI agents that read, write, and take action in Lob — with guardrails, audit, and human-in-the-loop.
Learn more →Agent Gateway for MCP
Expose Lob actions as governed MCP tools — observable, rate-limited, authenticated.
Learn more →Tray Helix
Build apps on Lob data with your AI assistant, then deploy, run, and govern them on Tray.ai.
Learn more →More marketing apps on Tray.ai
Dedicated connectors and other apps Tray.ai reaches in the same category. See every marketing connector →
Frequently asked questions
What can a Tray.ai workflow do in Lob?
+
The Lob API documents 23 actions across 6 resources (Postcards, Letters, Checks, Addresses, Address verifications, Templates). For example: Create a postcard; Create a letter; Create a check. A workflow can make any documented call through the HTTP Connector.
How does Tray.ai authenticate with Lob?
+
The Lob API uses basic authentication. You save it once as a Tray.ai authentication, and the HTTP Connector adds it to every request.
See Lob working against your stack.
We'll walk through a tailored demo with your systems plugged in.
Thanks — someone from our team will be in touch soon.