Letters, Certified Mail and postcards from $0.99, postage included. No API key, no account. Quote, confirm, send; nothing spends without your say-so.
Free to quote, free in the sandbox. Your card is charged when the letter prints.
$0.99
starting price, postage and envelope included
3–5
business days for First-Class or Certified to arrive
1
business day to USPS, if ordered by 2pm ET
0
API keys, accounts or plans to set up
USPSLetters, Certified Mail and postcards from the web, an agent, the CLI or the API. Every piece is quoted, confirmed and sent, and every piece gets a status page.
Nothing prints until payment is authorized. After that, one status page follows the piece until USPS delivers it.
Claude
ChatGPT
CursorPOST /v1/quotes$12.99 · holds 30 minconfirmation_tokenpayment authorizedPOST /v1/ordersord_8k2d created$ npx paperplane send notice.pdf \ --class certified \ --to "Maria Alvarez, 1 Main St, Richmond VA 23220" \ --from "Alex Rivera, 12 Grove Ave, Richmond VA 23221" Order ord_8k2d — status: pending_payment Pay to send: paperplane payment link $
Add --sandbox to run the whole pipeline for free. Nothing prints.
POST /v1/orders Content-Type: application/jsonAuthorization: Bearer sk_live_…not needed
Each order carries its own payment: a prepaid credit code, or a paperplane payment link a human approves.
One endpoint for every assistant. The quote is free; the send only redeems a token that quote minted.
send_letter warns the agent before it runs: spends money and mails a physical object to a real address. Not reversible once printed.
"sandbox": true$0.00"sandbox": false$12.99HTTP 400 { "code": "confirmation_expired", "reason": "Past its 30-minute window. Quote again." }
The same letter and the same price from the web, an AI agent, email, text or your own site.
Same USPS service, same proof of mailing. What changes is the printer, the envelope, the form and the line.
| What | paperplane | At the counter |
|---|---|---|
| Printer, envelope | not needed | yours |
| PS Form 3800 | done for you | by hand |
| Address check | before you pay | Not available |
| Time | 2 min | 10 min + line |
| Proof of mailing | emailed, kept | a paper slip |
| Price, all in | $12.99 | fees + your costs |
Certified Mail, at the counter
Ten minutes at the counter with no line. Then do it again for the next recipient.
Certified Mail, from where you are
About two minutes. No form, no line, no slip to keep.
Or hand it to an assistant: the same send runs over MCP, the API, or the CLI.
The math on one certified letter
The fees go to USPS either way. The $14.99 buys not making the trip.
Three jobs, one send flow, one all-in price. Each links to the guide that goes deeper.
The letter is the evidence: Certified Mail, a checked address, and a tracking page you can hand to a lawyer.
For the letter that has to hold up →Upload a CSV of clients or tenants; every row becomes its own individually addressed letter.
For mailing a list without mail-merge →An MCP endpoint and REST API with a free sandbox. A person approves every payment link.
For the agent and developer docs →Illustrative scenarios · not customer reviews
We haven't launched, so there is no one to quote yet. These are written examples of jobs the product does today: the people are made up, the capabilities are not.
The agreement says notice by certified mail, return receipt requested — so that is exactly what gets picked, and the receipt records both the mailing and who signed for it. Certified envelopes never carry our mark, so the letter arrives looking like it came from the company that sent it.
A CSV export becomes 40 individually addressed First-Class letters in one pass — no mail-merge document, no campaign platform. Rows with a repaired ZIP or a missing city are flagged before anything prints, and each letter is tracked on its own afterwards.
The demand goes Certified with an electronic Return Receipt, which is what makes the statutory clock provable rather than merely started. That receipt records who signed for it and when — the exact record a security-deposit dispute turns on.
The agent quotes the letter for free, then calls send and gets back a payment link for a human to approve — it cannot spend on its own. The same path runs end to end in the sandbox, free, with nothing printed.
Every mailed piece has a status page: at the print facility, in the mail, delivered. Certified letters carry the USPS tracking number and, with the electronic Return Receipt, the signed delivery record. Share the link with a lawyer or a landlord; no login on either end.
How tracking works
Printing, the envelope and USPS postage are in the number. No account, no plan, nothing added at checkout.
$0.99
1 page, black and white, envelope and postage included
Extra pages $0.25 · Color +$0.50/page · Tracking +$0.99
$12.99
Proof of mailing and USPS tracking
The one landlords, courts and the IRS take seriously
$14.99
Adds a signed electronic proof of delivery
The signed delivery record, emailed as a PDF
$24.99
Flat-rate envelope, 1 to 3 day delivery
For the letter that cannot wait
$0.99
4x6, message only, printing and postage included
6x9 $2.99 · 6x11 $3.49 · no envelope, no tracking
from $1.99
Folded notecard, handwritten typography, printing and postage included
For $1 more, a robot hand-writes it with a real pen. Enclosed like a greeting card, not open like a postcard
Extra pages $0.25 each. Color $0.50 a page. Tracking on First-Class $0.99. Full detail on the pricing page.
Pick your client and paste one config. Ask it to quote a certified letter in the sandbox: free, and nothing is mailed. For real sends, you approve the payment link.
Step 1
Connect
claude mcp add --transport http paperplane https://sendpaperplane.com/api/mcpTry it: free, nothing mailed
Tell your agent:
Using the paperplane tools, quote a 1-page certified letter to Property LLC, 1 Main St, Richmond VA 23220, from Alex Rivera, 12 Grove Ave, Richmond VA 23221, then send it in sandbox mode.Upload a PDF or paste your letter text. You see the exact pages that will print before you pay. We print it, seal it in a windowed envelope and hand it to USPS, usually the next business day. You get an email receipt and a status page.
You can. For a letter you already know how to send, you probably should. paperplane does not replace the post office; it replaces the trip. The USPS service and the proof of mailing are the same either way. What you skip is the printer, the envelope, PS Form 3800, the line and the paper slip you keep for a year. And an AI agent cannot stand in line for you.
No. Claude, ChatGPT and other MCP clients can quote a letter and prepare the send, and the sandbox runs the whole path free. A quote is bound to that exact recipient, letter and price for 30 minutes. Every send spends only what a person put there: a payment link you approve, or a credit code you bought and handed over.
No. Pay per letter with a card or Apple Pay. Your email gets a receipt and a private tracking link, and that is the entire relationship.
Certified Mail is a USPS service that gives you proof you mailed something and proof it arrived. Use it for security deposit demands, notice to a landlord, IRS correspondence, insurance disputes and anything a court might ask about. The electronic Return Receipt adds the recipient’s delivery record.
Your card is held for the quoted total and charged once, when the letter prints. If screening refuses the letter or we cannot print it, the hold is released and you are not charged.
No, and it does not try to be. The counter costs less in fees if your time is free. $12.99, or $14.99 with the electronic Return Receipt, buys one all-in price, a USPS address check, the exact PDF before you pay, and no account.
Documents are encrypted in transit and at rest, are never used for anything except printing your letter, and are deleted 30 days after delivery. An automated screen, with human review only when flagged, checks for fraud and threats, for the same reason the post office has rules.
Connect an AI agent or send one letter yourself. Same USPS service, one all-in price from $0.99.