# Sendpaper

> Physical mail for AI agents. Sendpaper prints and mails real postcards and letters to US addresses via USPS First-Class. Agents call an MCP server or REST API with no API key; every order returns a checkout_url that a person pays, plus a preview_url of the exact print. Nothing is printed until paid, and a person reviews every piece.

## Connect
- MCP endpoint (Streamable HTTP, no auth): https://sendmypaper.com/mcp
- Tools: get_pricing, create_postcard, create_letter, pay_order, get_order, cancel_order
- Setup for Codex, Muse Code, Claude and other clients: https://sendmypaper.com/#connect

## Docs
- Documentation: https://docs.sendmypaper.com
- Full docs for LLMs: https://docs.sendmypaper.com/llms-full.txt
- OpenAPI spec: https://sendmypaper.com/openapi.json
- REST base URL: https://sendmypaper.com/v1

## Products
- Postcard 4×6 (4 × 6 in): $2.99, Full-color front, your message on the back.
- Postcard 6×9 (6 × 9 in): $3.99, Bigger card, more room for a photo and a note.
- Letter (8.5 × 11 in): $4.99, Up to 3 printed pages, folded into a #10 envelope.

## Payment
- Agents can pay with a Stripe shared payment token (spt_…) the user approved, scoped to the order amount in USD: call pay_order, or POST /v1/orders/{id}/pay with {"shared_payment_token": "spt_…"}.
- Otherwise the user pays the order's checkout_url (Stripe Checkout).
- Guide: https://docs.sendmypaper.com/guides/agent-payments

## Rules
- US addresses only; a return address is required.
- Confirm addresses and wording with the user before creating an order; show them the preview and checkout links.
- Content policy (no threats, harassment, fraud, obscenity or bulk marketing): https://sendmypaper.com/content-policy