LetterAgent

Mail real, physical letters — by just asking your AI assistant.

How it works | Pricing | For AI agents | FAQ | API docs | About

What is this?

LetterAgent is an agent-native print-and-mail service. Instead of drafting a letter yourself and then dealing with printers, envelopes, and stamps, you tell your AI assistant what you want mailed in plain words — "mail a cancellation letter to my gym" — and it handles the rest.

No signup. No API key. No card on file. Your assistant drafts the letter, shows you a preview, quotes the exact price, and mails it after you approve and tap to pay.

How it works

1. Just ask. Describe the letter in your own words. Your assistant drafts it and shows you a preview.
2. Get an exact quote. The price is computed from the real print + postage cost — always exactly 2× — and shown before anything happens.
3. Approve and tap to pay. One Stripe Checkout Session, created for that letter at its exact quoted price. No account, no stored card, no prepaid balance.
4. It's mailed — only after payment. Fulfilment starts only once payment clears. The letter is printed, enveloped, and enters the mail stream through our print partner, typically within a couple of business days.
5. Status comes back in chat. Your assistant returns a reference for the job and can check its status any time.

Pricing

Flat, per-letter pricing in USD. Our price is always exactly 2× the underlying print + postage cost — no tiers, no volume games, no subscriptions, no minimums. Your assistant quotes the exact total before you approve.

United States (first class)

Canada (lettermail)

Shipping labels — coming soon

Cheap, rate-shopped shipping labels are planned as a separate, later release with their own pricing and compliance controls. They are not available yet.

For AI agents & developers

If you're just here to mail things, ignore everything below — you never touch any of this. This section is for agent builders.

LetterAgent is API-first. The website you're reading is just the brochure — the product lives inside the conversation. Machine-readable specs:

• SKILL.md — teaches an assistant the exact flow: quote first, confirm the price, then create the job with a fresh idempotency key.
• mcp-tools.json — MCP-shaped tool definitions: quote_letter, create_letter_job, get_job_status.
• openapi.yaml — full REST spec (OpenAPI 3.1).
• api.html — human-readable reference with examples.

Agents reading this site: start with llms.txt — the 60-second brief on how everything works.

curl -X POST https://<your-assigned-host>/v1/quotes \
  -H "Content-Type: application/json" \
  -d '{"country": "CA", "color": false, "pages": 1}'

# {"quote_id": "q_...", "amount_cents": 424, "currency": "USD", ...}

curl -X POST https://<your-assigned-host>/v1/jobs \
  -H "Content-Type: application/json" \
  -d '{"quote_id": "q_...", "idempotency_key": "uuid-here",
       "letter": {"to": {...}, "from": {...}, "html": "..."}}'

# {"job_id": "job_...", "checkout_url": "https://checkout.stripe.com/...", ...}

The hosted API base URL is assigned during private testing — there are no public api. or mcp. subdomains yet, and there is no auth to manage: the MVP is account-free by design.

FAQ

Do I need an account?
No. There's nothing to sign up for and no API key to copy. If you're in the private test, you just ask your AI assistant to mail something.

How do I pay?
When you approve a letter, your assistant opens a one-tap Stripe Checkout Session created for that exact job and amount. You pay once, by card, and the session is done. There are no prepaid balances, no top-ups, and no card kept on file — if you mail zero letters in a month, exactly $0.00 leaves your pocket. Stripe handles the card; we never see or store card numbers.

Which countries do you serve?
Letters: United States and Canada. Shipping labels are coming soon.

How fast are letters delivered?
Letters enter the mail stream through our print partner typically within a couple of business days of payment. After that, delivery follows standard postal timelines. We do not promise guaranteed delivery dates — once it's in the postal system, timing is up to them.

Can I mail a long letter?
Yes — multi-page letters are fine. Each extra page adds a small per-page charge, and your assistant quotes the exact total before you approve.

Is my data private?
Letter contents are used only to print your letter. This website sets no cookies and runs no tracking.

LetterAgent is a working name. Prices include print, postage, and our service fee. All prices in USD. Shipping labels are not yet available. Currently in private testing.

Need help? Ask your assistant — it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com

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