Sendpaper - 2026 Pricing, Features, Reviews & Alternatives

Sendpaper is a cloud-based REST API and MCP server that allows AI agents and human users to create and send physical mail to US addresses, including Puerto Rico, territories, and APO/FPO/DPO military addresses. Accessible via a hosted MCP server, a REST API, or directly through the web app at sendmypaper.com, Sendpaper requires no account, sign-up, subscription, or API key to get started. Pricing is strictly per-piece, covering printing, envelope, and USPS postage in a single listed price.

Sendpaper supports postcards in three formats (4x6 at $2.99, 6x9 at $3.99, and 6x11 at $5.99), each with up to 600-character messages and multiple front layout options including solid color headline, single photo, photo with caption, and two-to-four photo collages. Letters print up to three pages on 8.5x11 stock, folded into a #10 window envelope ($4.99). PDF uploads of up to six pages are fitted automatically to 8.5x11 with an address page added. Certified Mail with tracking and proof of mailing or delivery is available at $14.99, with an optional return receipt adding recipient signature capture at $19.99. USPS Priority Mail express delivery adds $10.00. Batch sending supports two to twenty-five recipients per order through a single checkout link, and all orders are mailed within one business day after a mandatory human review of every piece before printing.

Sendpaper functions as an MCP server compatible with Codex, Muse, Claude, ChatGPT, Cursor, VS Code, and any MCP or HTTP client. AI agents can draft content, generate an exact print preview, and submit payment via a one-time, amount-capped Stripe token approved by the user, without exposing card details. Target users include individual AI agent users, developers building agent-driven mailing workflows, small businesses sending client correspondence via an AI assistant, and general consumers or legal correspondents handling IRS replies, lease notices, debt disputes, or contract cancellations.