How to send a real postcard with Meta Muse

Connect No Errands Mail to Muse once and you can say "send Grandma a postcard of the canyon photo" and a real card, printed and stamped, goes out in the post. A postcard costs $1.49, all in. Set-up takes about five minutes. United States addresses only.

What you need

• A Muse account.
• The recipient's full mailing address.
• A photo for the front, reachable at a public web address. A link to an image already online works; a photo only on your phone does not.
• A message of 350 characters or fewer, or an idea Muse can write up.
• A card to buy credits with.

Step 1: Get a key

Go to https://noerrands.com/get-key, enter your email, and leave the choice on read and write so Muse is allowed to send. The key is shown once, so keep the tab open until step 3.

Step 2: Paste this prompt into Muse

Copy the whole block and paste it into Muse as one message.

Build a custom connector for No Errands. One API key covers three services:
printed mail (letters and postcards), fax, and appointment booking.

1. Read these three connector briefs and follow them exactly:
   https://noerrands.com/connectors/muse.md
   https://noerrands.com/connectors/fax/muse.md
   https://noerrands.com/connectors/booking/muse.md

2. Store my API key in the Secure Credentials Store as NOERRANDS_API_KEY.
   The same key works for all three. Never print, log, echo, or repeat it,
   not even partially.
   Send it as the header: Authorization: Bearer <NOERRANDS_API_KEY>

3. Prefer the MCP endpoints (streamable HTTP):
   https://api.noerrands.com/c/mail/mcp
   https://api.noerrands.com/c/fax/mcp
   https://api.noerrands.com/c/booking/mcp
   If you use the REST APIs instead, each brief links its OpenAPI document.

4. Before you mail anything, fax anything, or book anything, show me exactly
   what will happen, what it costs, and who it goes to, and wait for my
   explicit approval. Never act without asking me first.

5. Save this as a reusable skill called "Mail, fax and bookings".

Muse reads our connector brief, writes its own client, tests it, and saves it as a reusable skill. Approve network access to our domain when Muse asks. You will see a caution notice because Meta does not review custom connectors.

Step 3: Paste your key into the Secure Credentials Store

When Muse asks for the key it opens its Secure Credentials Store. Paste the key in there, never into the chat.

Muse's agent never sees the real key. It works with a stand-in token and the real value is swapped in at the network edge, so a web page cannot talk Muse into leaking it.

Step 4: Add credits

Your balance starts at $0.00. Say:

Add credits to my mail account.

Muse hands you a checkout link and you pay in your own browser. Your options are $2.49 for a single letter, or $10.00 for $12.50 of credit (one free letter), $25.00 for $32.50 of credit (three free letters) and $50.00 for $67.50 of credit (seven free letters) -- every pack credits more than it costs.

Step 5: Ask Muse to send the postcard

For example:

Send a postcard to Ada Lovelace, 1 Main St, Austin TX 78701. Put the photo at https://example.com/canyon.jpg on the front and write something short about our trip to the canyon last weekend.

Muse will:

1. check the address and fix the formatting;
2. get an exact price;
3. show you the recipient, the image it will use, the message text, and the total;
4. wait for you to say yes.

Nothing is printed until you approve. After approval Muse reports a mail ID and the expected delivery date.

The back of the card holds 350 characters, roughly two short paragraphs. If your message is longer, Muse will tell you and offer to trim it. Ask for a letter instead if you need more room.

What it costs

Item	Price
Postcard, printed and mailed	$1.49
Checking the address	Free
Getting a price quote	Free

See full pricing.

Questions people ask

Is my key safe?

Yes, as long as it goes into Muse's Secure Credentials Store and not into a chat message. Muse's agent only handles a stand-in token; the real key is inserted outside the agent's reach. We store only a hash of it, so we cannot read it back either.

If a key may have leaked, email support@noerrands.com and we will revoke it.

Can Muse send a postcard without asking me?

No. Before every send, Muse must check the address, get a price, show you the recipient and what will be printed, and get your explicit yes. Sending is a separate, consequential call and Muse's permission layer treats it that way.

For a hard guarantee, ask for a read-only key. The server refuses any send made with one.

What if I run out of credits?

The send stops before anything is printed. Muse tells you the shortfall and gives you a top-up link, then stops. It does not retry. Add credits and ask again.

Can I mail outside the US?

Not yet. United States addresses only.

What happens to my photo?

We pass the image URL to our print partner so they can print the card. We do not use your photos for anything else. See the mail connector privacy page.

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Next: send a letter with Muse.