CustomCat
Browse print-on-demand products, manage designs, check shipping costs, and place orders with CustomCat.
Connect to CustomCat to browse your custom products and the full catalog of printable blanks, upload and manage designs, calculate shipping costs to any country, and create or cancel orders. Requires a CustomCat account and API key.
Try asking Muse: "Check the shipping cost to Canada for a custom t-shirt order and then place it."
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Source: Found in the official MCP Registry (io.usefulapi/customcat) · First listed October 29, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 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://customcat.usefulapi.io/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
CustomCat is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://customcat.usefulapi.io/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 1101ms. Worked in n/a of checks over 30 days.
Screening · October 29, 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 · 12
customcat_list_productsList the products you set up in CustomCat (a design on one or more catalog items) with variants, SKUs, cost, price, stock flag and design images. Use the variant SKUs when placing an order for these products. GET /product.customcat_get_productOne of your CustomCat products by id (e.g. 22-2580581): variants, SKUs, cost, price, options, designs. GET /product/{product_id}.customcat_list_designsList the designs uploaded to your CustomCat account: id, name, tags, image URLs, default product and last-updated time. GET /design.customcat_list_catalog_categoriesThe CustomCat catalog categories (Digisoft, Sublimation) and their subcategories (e.g. T-Shirts, Sweatshirts, Bags), to narrow customcat_list_catalog. GET /catalogcategory.customcat_list_catalogBrowse the full CustomCat catalog of printable blank products (the items you can order with your own artwork). Filter by category and subcategory from customcat_list_catalog_categories. The reply carries the total in `total`. GET /catalog.customcat_get_catalog_productOne catalog product by numeric id with its colors, sizes and SKUs. GET /catalog/{catalog_product_id}.customcat_get_catalog_skuOne catalog SKU with its price and stock status. Use it before ordering: a SKU that is out of stock, discontinued or invalid makes the order fail. GET /catalog/sku/{catalog_sku_id}.customcat_list_shipping_methodsThe shipping methods CustomCat offers for a destination country (ids and names). The method name is required when placing an order. GET /shipping.customcat_get_shipping_costCalculate the shipping cost of one shipping method for a destination and a list of catalog SKUs with quantities. Read-only quote: it places nothing. POST /shipping/{shipping_id} (shipping_id from customcat_list_shipping_methods).customcat_get_order_statusStatus of an order by YOUR order id: order status (Pending, Verified, Shipped), per-item production status, shipments with tracking ids, totals and the ship-to address. Set sandbox=true to look up a sandbox test order. GET /order/status/{order_id}.customcat_create_orderWRITE: place an order for CustomCat to print and ship. This CHARGES the payment method on file in your CustomCat account (product cost + shipping; a front+back print adds $5 per line item) unless sandbox=true, which only validates the order. A real order (sandbox=false) also needcustomcat_cancel_orderWRITE: cancel (delete) an order by YOUR order id. CustomCat can only cancel an order that has not gone into production; one already printed or shipped is refused. Needs the Write API key. Confirm with the user first. DELETE /order/{order_id}.Link
https://customcat.usefulapi.io/mcpQuestions about CustomCat in Muse
How do I connect CustomCat to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use CustomCat to help me. It is a free service with an MCP server at https://customcat.usefulapi.io/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 CustomCat working right now?
At the last check (October 29, 2026, 22:46 UTC) the endpoint was working, answering in 1101ms. It is checked every 15 minutes.
Is CustomCat safe to connect to Muse?
It was screened on October 29, 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 CustomCat do in Muse?
It exposes 12 tools, including customcat_list_products, customcat_get_product, customcat_list_designs, customcat_list_catalog_categories. For example, you could ask Muse: "Check the shipping cost to Canada for a custom t-shirt order and then place it."
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This listing was added from public sources (Found in the official MCP Registry (io.usefulapi/customcat)). If you build CustomCat, claim it to correct the details and get your badge.
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