Sendpaper

What the Sendpaper MCP server does

The Sendpaper MCP server connects an AI agent to Sendpaper’s physical-mail service for creating and tracking postcard and letter orders. It covers US addresses and includes printing plus USPS postage in the listed price. A person reviews each item before it is printed and mailed.

Postcards can use 4×6, 6×9, or 6×11 formats. Their fronts may contain a large colored headline, one photo, a photo with a caption, or a collage of two to four photos. The message and recipient address appear on the back, with handwriting, serif, or sans-serif styling available.

Letters are printed on 8.5×11 paper and sent in a #10 envelope. An agent can provide written content of roughly three pages, optionally with a photo, or submit a publicly accessible HTTPS PDF URL of up to six pages. Certified Mail and a return receipt are available for notices and other correspondence requiring delivery evidence. Priority Mail express delivery is also supported where compatible with the selected order.

How the Sendpaper MCP server works

The Sendpaper MCP server uses the hosted MCP endpoint at https://sendmypaper.com/mcp. An agent first checks prices, then creates an order and receives a print preview with a Stripe checkout link. The agent can create one order for a group of up to 25 recipients by passing a recipient list instead of a single destination.

Payment is a separate approval step. A user can complete checkout, or an agent can call pay_order with a Stripe shared payment token beginning with spt_; that token must cover the order amount and be approved for this purchase. Group orders require a token scoped to the batch price. After successful payment, the order moves to printing, subject to human review.

Unpaid orders can be cancelled through the server. Paid orders may be cancellable by contacting support before printing. Order status is retrieved with the order ID.

Tools and capabilities

• get_pricing lists products and prices in USD for US addresses.
• create_postcard creates a postcard order and returns payment information.
• create_letter creates a written-letter or PDF-letter order.
• pay_order pays an approved unpaid order with a Stripe shared payment token.
• get_order retrieves postcard or letter status by order ID.
• cancel_order cancels an unpaid order.

Setup and configuration

Codex can add the hosted endpoint with codex mcp add sendpaper --url https://sendmypaper.com/mcp. Muse Code uses a streamable-HTTP MCP entry with the same URL. Claude Code can install the Sendpaper plugin, which includes the MCP server and send-mail skill, or add the endpoint directly with claude mcp add --transport http sendpaper https://sendmypaper.com/mcp.

No environment variables are documented as required. Prices may change; agents should call get_pricing before presenting a purchase amount. Express delivery uses USPS Priority Mail, while certified options provide tracking and, when selected, proof of delivery or the recipient’s signature.