What it costs to mail a letter from Claude or ChatGPT: 15 services compared
What 15 services charge to print and mail one letter from an AI app, read from their price pages on November 14, 2026. Certified Mail runs $8.83 to $20.00.
At least fifteen services now let Claude, ChatGPT or another AI app put a real letter in the US mail. You ask in the chat, the service prints the letter, puts it in an envelope and hands it to the Postal Service. For the same one-page letter they charge anywhere from about one dollar to five, and for Certified Mail from under nine dollars to twenty.
This page lists what each one charged on November 14, 2026, read from its own price page. Each name links to the page we read, so you can check it. We run Mailsnail, one of the fifteen, so read this as a comparison written by a competitor: every number has a source, and where another service is cheaper or does something we do not, we say so.
The short version
- Certified Mail: Mailsnail was the lowest of the fifteen, at $8.83 for a one-page letter paid by card and $11.83 with an electronic return receipt. The next lowest was PostalForm at $11.40 and $14.40. The highest was mailbox.bot at $20.00 and $24.00.
- A First-Class letter: Mailsnail was $1.51 paid by card, or $1.21 from a prepaid balance. DirectMailAmerica was two cents lower at $1.49. Two services built for developers and businesses were lower still: RobotPostal at $1.02 and MailStream at $1.05. The other nine ran from $2.00 to $5.00.
- Doing it yourself: at the post office a stamp is $0.82 and Certified Mail is $6.37, plus the paper, the envelope and the trip.
One page by First-Class Mail
A plain letter with a stamp: no tracking and no proof of delivery. Prices are for one black-and-white page mailed to a US address.
| Service | Price |
|---|---|
| Do it yourself at the post officeThe price of a stamp. You print the letter, find an envelope and mail it. | $0.82 |
| RobotPostalAn API for people who build agents. It prices at USPS retail plus 20%. No Certified Mail listed. | $1.02 |
| MailStreamA direct-mail tool for businesses. Your first purchase of credit is at least $50. $0.89 on its $99-a-month plan. No Certified Mail listed. | $1.05 |
| DirectMailAmerica$0.25 for each extra page. In Claude's directory. | $1.49 |
| Mailsnail$1.21 from a prepaid balance. Extra pages cost about ten cents each. | $1.51 |
| mailbox.botPaid from credit you buy first. | $2.00 |
| Postmarkr$0.20 for each extra page. In Claude's directory. No Certified Mail listed. | $2.05 |
| Mail A Letter$0.49 for each extra page. | $2.49 |
| Letter IRLSold in packs: two letters for $5. $2.00 each in a pack of five, $1.80 in a pack of fifty. No Certified Mail listed. | $2.50 |
| PostalFormThe price includes an address page it adds to every letter. | $3.40 |
| SendPaperThe price covers up to five pages. | $4.00 |
| PaperAgentThe price covers up to six pages. In Claude's directory. New York sales tax is added where it applies. | $4.99 |
| PostedlyBefore tax. In Claude's directory. Also sends faxes, postcards and handwritten cards. | $4.99 |
| MatterSnailBuilt for law firms. This is its own example of a two-page letter on the free plan. $3.00 on the $18-a-month plan. | $5.00 |
Piloxa and PieterPost are in the next table. Piloxa sells Certified Mail only, and the price PieterPost lists for a US letter is for Certified Mail.
One page by Certified Mail
Certified Mail gives you a tracking number and a record that the letter was mailed and delivered. A return receipt adds the signature of whoever accepted it. The electronic kind is a PDF. The green card is the paper card that is mailed back to you.
| Service | Certified Mail | With electronic return receipt |
|---|---|---|
| Do it yourself at the post officeA stamp plus the $5.55 Certified Mail fee. The electronic receipt adds $2.91 and the green card $4.65. | $6.37 | $9.28 |
| Mailsnail$8.61 and $11.64 from a prepaid balance. With the green card: $14.42. | $8.83 | $11.83 |
| PostalForm | $11.40 | $14.40 |
| PiloxaA first letter is $9.95 without the receipt, once per account. | $12.97 | $15.97 |
| DirectMailAmerica | $12.99 | $15.39 |
| PostedlyBefore tax. | $14.99 | not listed |
| SendPaper | $15.00 | $19.00 |
| Mail A Letter | $15.48 | not listed |
| MatterSnailIts own example of a five-page letter on the free plan. | $16.35 | |
| PieterPostIts Certified Mail always includes the electronic receipt. | $16.50 | |
| PaperAgentIts price page says the service comes with no signature copy or return receipt. | $19.00 | not offered |
| mailbox.bot | $20.00 | $24.00 |
Postmarkr, Letter IRL, RobotPostal and MailStream do not list Certified Mail. The paper green card is on our price list. We did not find it on the others.
What the price covers
Pages. Most of these prices are for one page. PaperAgent's covers up to six pages and SendPaper's up to five, so the gap narrows for a long letter. A six-page First-Class letter is $4.99 at PaperAgent, $4.40 at SendPaper, $2.74 at DirectMailAmerica and about $2.00 at Mailsnail.
Tax. PaperAgent adds New York sales tax where it applies, and Postedly lists its prices before tax. Mailsnail's price is the whole charge.
How you pay. Mailsnail, PaperAgent, Piloxa and Postmarkr take one card payment for the one letter. Letter IRL sells packs. mailbox.bot and MailStream draw on credit you buy first. Mailsnail also has a prepaid balance, which is where its lower price comes from.
Seeing it first. Before you pay anyone, check that you are shown the letter as it will be printed and the final price. Mailsnail shows both before anything is charged.
Why Mailsnail's prices are lower
Every service on this page buys printing and postage, then sets its own price for the work around them. We chose to sell at cost. A Mailsnail price is what our print partner charges us for the printing, the envelope and the postage, plus the card processing fee, with nothing added. Our prices and how they are worked out.
When another service is the better choice
- You want it in Claude's directory today. PaperAgent, Postmarkr, Postedly and DirectMailAmerica are listed there, so adding one takes a click. Mailsnail is not in the directory yet. You add it by pasting one address, which Claude allows on every plan, including Free. The steps for Claude.
- You use ChatGPT on a personal plan. OpenAI's help page describes adding a service like ours by hand only for business and school workspaces. Piloxa says it is in ChatGPT's plugin directory and works on ordinary accounts, and Letter IRL is built for ChatGPT. Or use Claude, whose free plan can add Mailsnail.
- The letter is going abroad. Mailsnail mails to US addresses only. Mail A Letter and RobotPostal list international prices. Print and Mail Company, which is in Claude's directory, posts from Europe to most countries.
- You want a postcard, a fax or a handwritten card. Postedly lists all three, and DirectMailAmerica sends postcards. Mailsnail sends letters.
- You are a law firm sending the same notice to many people. MatterSnail is built for that.
- You send marketing mail in volume. Look at MailStream, or at the mail APIs in our comparison with Lob and PostGrid.
How we checked
On November 14, 2026 we opened each service's price page and wrote down the price of one black-and-white page mailed to a US address, with no extras. Where a service gives no single price for one page, the table says what its number is. The post office prices come from the Postal Service's price list, Notice 123, and its page on extra services. Whether a service is in Claude's directory is what we saw in the directory that day.
Prices in this market change often. If a number here is out of date, write to hello@mailsnail.dev or open an issue on GitHub, and we will correct it.
Related guides
FAQ
What is the cheapest way to mail a letter from Claude or ChatGPT?
On November 14, 2026, a one-page First-Class letter cost $1.49 at DirectMailAmerica and $1.51 at Mailsnail when paid by card, or $1.21 at Mailsnail from a prepaid balance. RobotPostal ($1.02) and MailStream ($1.05) list lower prices but are built for developers and businesses. The other services we found charge between $2.00 and $5.00.
What is the cheapest way to send Certified Mail from an AI app?
Mailsnail, at $8.83 for a one-page letter paid by card and $11.83 with an electronic return receipt. The next lowest we found was PostalForm at $11.40 and $14.40. Doing it yourself at a post office costs $6.37 and $9.28, plus the paper, the envelope and the trip.
Why do prices for the same letter differ so much?
Postage is the same for everyone. What differs is each service's own charge for the work around it, and what it bundles in: PaperAgent's price covers up to six pages and SendPaper's up to five, while most others charge by the page. Mailsnail sells at its own cost with no markup.
Is Mailsnail in Claude's connector directory?
Not yet. You add it as a custom connector by pasting https://api.mailsnail.dev/mcp, which Claude allows on every plan, including Free. PaperAgent, Postmarkr, Postedly and DirectMailAmerica were listed in the directory on November 14, 2026.
How current are these prices?
Every price was read from the service's own page on November 14, 2026. Prices in this market move often, so check the linked page before you decide. The date at the top of this page shows when we last re-read the sources.
Send yours from Claude or ChatGPT
Mailsnail adds mailing to the AI app you already use. You connect it once, then ask for a letter in plain words. There is nothing to install and no subscription.
Add Mailsnail to your app
Copy this address. It is the same in every app.
address to pastehttps://api.mailsnail.dev/mcpIn Claude (every plan, including Free)
- On claude.ai or in the Claude desktop app, open Customize, then Connectors.
- Press “+ Add”, then “Add custom connector”.
- Name it Mailsnail, paste the address and press Continue. Keep the settings Claude suggests, then press Add.
- Sign in when Claude asks. The first time, you create your Mailsnail account on the page that opens.
A Free account can hold one custom connector. On Team and Enterprise an owner has to add it first.
In ChatGPT (on the web, and not on every plan)
- On chatgpt.com in a browser, open Plugins. The mobile app cannot add a server.
- Press the plus button, then “Add custom MCP server”.
- Name it Mailsnail and paste the address as the server URL. Choose OAuth for authentication, tick “I understand and want to continue”, and press “Create as a plugin”.
- Install the plugin it creates, and sign in when the Mailsnail page opens. Then, in a new chat, type @ and choose Mailsnail.
OpenAI decides which plans can add a custom server, and that changes. Its help page describes it for Business, Enterprise and Edu workspaces, where an admin or owner adds it. If your plus button has no “Add custom MCP server”, your plan does not include it. Claude’s free plan can add it.
Using another app? The setup page has the steps for Claude Code, Cursor and others.
Ask for your letter
In a new chat, say who the letter goes to and what it should say. For example: “Mail a letter to Jane Doe at 1 Main St, Brooklyn NY 11201 that says thank you for the referral. Show me the proof and the price first.”
Read the proof, then pay for that one letter
You see the letter as it will be printed, and its exact price, before anything is charged. When you approve it, you get a link to pay by card for that letter alone. There is no subscription, and your card is not saved. What a letter costs.