Premier Letters
Send handwritten letters, cards and postcards through the mail with real pen and USPS delivery.
Premier Letters connects to a handwriting and mailing service. Muse can help you quote, preview, order and track real pen-written letters and postcards sent via USPS, with options for handwriting style, paper type and delivery method.
Try asking Muse: "Send a handwritten thank-you letter to my client and track when it arrives."
Source: Found in the official MCP Registry (com.premierletters/mcp) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 1 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://www.premierletters.com/api/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 635ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 8
get_pricingGet a live price quote for a Premier Letters order. Pass char_count (or letter_count for a rough estimate) plus optional mailing_option and paper_type to get a per-piece and total price, in cents. No account needed.list_handwriting_stylesList available handwriting styles (fonts) for a letter order. Use the returned "id" as options.handwriting_style / handwriting_style when creating an order or previewing.list_templatesList the authenticated user's saved letter templates.verify_addressVerify and standardize a US mailing address via USPS. Use before create_order to catch typos and get the USPS-standardized form.preview_letterRender a preview of a handwritten letter (as an SVG image) and get its price, before creating an order. Does not save anything.create_orderCreate and pay for a Premier Letters order — a real, handwritten letter mailed via USPS. Requires a Premier Letters API key. Use get_pricing or preview_letter first to confirm the price. For payment, either "card_on_file" charges the caller's saved card immediately, or "checkout_get_order_statusGet an order's status, delivery/tracking summary, and per-recipient mail status.list_ordersList the authenticated user's recent orders.Recent checks
Link
https://www.premierletters.com/api/mcpQuestions about Premier Letters in Muse
How do I connect Premier Letters to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Premier Letters to help me. It is a free service with an MCP server at https://www.premierletters.com/api/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Premier Letters working right now?
At the last check (September 28, 2026, 07:46 UTC) the endpoint was working, answering in 635ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Premier Letters safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Premier Letters do in Muse?
It exposes 8 tools, including get_pricing, list_handwriting_styles, list_templates, verify_address. For example, you could ask Muse: "Send a handwritten thank-you letter to my client and track when it arrives."
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This listing was added from public sources (Found in the official MCP Registry (com.premierletters/mcp)). If you build Premier Letters, claim it to correct the details and get your badge.
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<a href="https://musedirectory.ai/connector/premier-letters"><img src="https://musedirectory.ai/badge/premier-letters.svg" alt="Premier Letters on musedirectory.ai" width="236" height="40"></a>