Send a letter or postcard from your AI agent
Yes, through a print and mail API with your own key. Lob mails postcards from $0.905 and letters from $0.828, mostly in the US. PostGrid sends letters, postcards and cheques (price not verified). Neither has an official MCP server. Postcard.bot has one for postcards.
| Option | Works today as | Price |
|---|---|---|
| LobSend real postcards and letters through the mail with an API call. | API from the vendor | Postcards starting at $0.905/piece; letters starting at $0.828/piece; Developer plan starting at $0/month |
| PostGrid Print & Mail APISend real letters, postcards and cheques by post from an API call. | API from the vendor | not verified |
| Postcard.bot MCP serverSend real printed postcards by post. | Official MCP from the vendor | free (open source) |
| Stannp Direct Mail APISend printed postcards and letters in the US and UK. | API from the vendor | not verified |
| Click2Mail Mail APIPrint and mail letters, postcards and certified mail through USPS. | API from the vendor | not verified |
| postals-mcpSend direct mail pieces from an agent with one tool call. | Community MCP server | free (open source) |
The route that works today
- Get your own API key from Lob or PostGrid.
- Have the agent call the API with the address and the content, or use an MCP server that wraps it.
- Approve each piece before it goes. Printing and postage cost money.
Keep a person on the spend
Every order here costs real money. Use your own account, and paste this rule into the chat or your agent's instructions:
Before you order or pay for anything, show me what you will buy, the exact price and where it ships, then wait until I reply yes. Never place more than one order per yes.
Lob is listed in our catalog with its postcard and letter tools. Calling them through our connector returns Lob's link, because we don't resell paid providers. See Lob in the catalog.
“Live through our connector” runs through Real World MCP today. “Official MCP” is the vendor's own server. “Manual” means you or a browser use the provider's site. Prices are the provider's own and change. Browse every mail & print entry.
What people have done
- Have your agent mail a credit card dispute letter
A developer built AgentPostage so his agents can send real letters, and has used it for credit card and credit bureau disputes and a gym cancellation.
- Have an AI agent run a real retail store
Andon Labs opened Andon Market on Union Street in San Francisco, run by an agent named Luna that picks products and buys stock with its own cards. One logged order was 24 mugs from Printful at $7.13 each.
- Let an agent pay for and send a print-and-mail order
PostalForm documents an endpoint where an agent validates a letter, pays in USDC over x402 or MPP, and tracks fulfilment for a real mailing on its owner's behalf.
- Let Claude Code run a receipt printer the internet can print to
A user had Claude Code connect an eBay receipt printer, put it online for strangers' messages, and added Claude moderation after a camera stream drew bad content. It ran on livestream for days.
Questions people ask
Can an AI agent mail a real letter?
Yes. Print and mail APIs such as Lob and PostGrid print and post letters and postcards. The agent needs your API key, and each piece costs money.
Does Lob have an MCP server?
Not an official one that we found. Agents call Lob's REST API. Postcard.bot has an official MCP server for postcards.
How much does it cost to mail a postcard by API?
Lob lists postcards from $0.905 and letters from $0.828 per piece. Prices vary by format and volume.