# CustomCat MCP by usefulapi (remote · customcat.usefulapi.io)

Browse the CustomCat catalog, your products and designs; check shipping; create and cancel orders.

- Trust score: 62/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-25

## Components

- remote · `customcat.usefulapi.io`: 62/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-customcat/customcat.md), [page](https://verifymcp.io/servers/io-usefulapi-customcat/customcat)

## Channel facts

- Endpoint: `https://customcat.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.1.3`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-25.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 82/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1689 tokens (~140/item across 12 items; 12 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 82% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 12 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 13 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the CustomCat MCP by usefulapi server?

CustomCat MCP by usefulapi is a hosted endpoint at https://customcat.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-customcat 'https://customcat.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-customcat": {
      "url": "https://customcat.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-customcat": {
      "type": "http",
      "url": "https://customcat.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-customcat]
url = "https://customcat.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-customcat": {
      "type": "remote",
      "url": "https://customcat.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-customcat --url 'https://customcat.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-customcat:
    url: "https://customcat.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-customcat": {
      "Transport": "http",
      "Url": "https://customcat.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-customcat -t streamable-http -u 'https://customcat.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-customcat": {
      "type": "http",
      "url": "https://customcat.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-25 (score 62, 0)

- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 1.1.0 → 1.1.3

### 2026-10-24 (score 62)

First indexed and scored.

## MCP tools (12)

### `customcat_list_products` (~153 tokens)

List your products

List 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.

Input parameters:

- `limit` (integer): Results per page, 1-250 (default 25).
- `page` (integer): Page number, from 1 (default 1). Pass the previous reply's next_page.
- `since_id` (string): Only products created after this product id.
- `updated_since` (string): Only products created or updated since this date (as CustomCat expects, e.g. 2026-10-01).

### `customcat_get_product` (~71 tokens)

Get one of your products

One of your CustomCat products by id (e.g. 22-2580581): variants, SKUs, cost, price, options, designs. GET /product/{product_id}.

Input parameters:

- `product_id` (string, required): CustomCat product id, e.g. 22-2580581.

### `customcat_list_designs` (~117 tokens)

List your designs

List the designs uploaded to your CustomCat account: id, name, tags, image URLs, default product and last-updated time. GET /design.

Input parameters:

- `limit` (integer): Results per page, 1-250 (default 25).
- `page` (integer): Page number, from 1 (default 1). Pass the previous reply's next_page.
- `since_id` (integer): Only designs created after this design id.
- `updated_since` (string): Only designs created or updated since this date.

### `customcat_list_catalog_categories` (~51 tokens)

List catalog categories

The CustomCat catalog categories (Digisoft, Sublimation) and their subcategories (e.g. T-Shirts, Sweatshirts, Bags), to narrow customcat_list_catalog. GET /catalogcategory.

### `customcat_list_catalog` (~135 tokens)

List the blank-product catalog

Browse 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.

Input parameters:

- `category` (string): Catalog category (CustomCat's default is Digisoft).
- `limit` (integer): Results per page, 1-250 (default 25).
- `page` (integer): Page number, from 1 (default 1). Pass the previous reply's next_page.
- `subcategory` (string): Subcategory name, e.g. T-Shirts.

### `customcat_get_catalog_product` (~46 tokens)

Get a catalog product

One catalog product by numeric id with its colors, sizes and SKUs. GET /catalog/{catalog_product_id}.

Input parameters:

- `catalog_product_id` (integer, required): Catalog product id.

### `customcat_get_catalog_sku` (~76 tokens)

Get a catalog SKU (stock check)

One 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}.

Input parameters:

- `catalog_sku_id` (integer, required): Catalog SKU id (numeric), e.g. 39515.

### `customcat_list_shipping_methods` (~66 tokens)

List shipping methods

The shipping methods CustomCat offers for a destination country (ids and names). The method name is required when placing an order. GET /shipping.

Input parameters:

- `country_code` (string): 2-letter ISO country code, e.g. US, GB (default: United States).

### `customcat_get_shipping_cost` (~117 tokens)

Get the shipping cost for items

Calculate 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).

Input parameters:

- `country_code` (string): Destination 2-letter ISO country code (default US).
- `items` (array, required): Catalog SKUs and quantities being shipped.
- `shipping_id` (integer, required): Shipping method id from customcat_list_shipping_methods.
- `state` (string): Destination state/province.

### `customcat_get_order_status` (~101 tokens)

Get order status

Status 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}.

Input parameters:

- `order_id` (string, required): Your order id, exactly as sent when the order was placed.
- `sandbox` (boolean): Look up a sandbox (test) order.

### `customcat_create_order` (~403 tokens)

Place an order

WRITE: 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 needs confirm=true, set only after the user confirmed it. The order id is yours and must be new (a duplicate is rejected). Needs the Write API key. Check stock with customcat_get_catalog_sku and the method name with customcat_list_shipping_methods first, and confirm the details with the user before calling. POST /order/{order_id}.

Input parameters:

- `confirm` (boolean): Required (true) for a real order (sandbox=false): set it only after the user has confirmed the items, address, shipping method and that their CustomCat payment method will be charged.
- `items` (array, required): Line items: either {sku, quantity} for products made in CustomCat, or {catalog_sku, design_url, quantity} for your own artwork.
- `order_id` (string, required): Your unique order id (for example 101-102938).
- `sandbox` (boolean, required): true = test order, nothing is charged or produced; false = a real, paid order.
- `shipping_address1` (string, required)
- `shipping_address2` (string)
- `shipping_city` (string, required)
- `shipping_country` (string, required): 2-letter ISO country code, e.g. US.
- `shipping_email` (string, required): Customer email (required by CustomCat).
- `shipping_first_name` (string, required)
- `shipping_last_name` (string, required)
- `shipping_method` (string, required): Method name from customcat_list_shipping_methods, e.g. Economy.
- `shipping_phone` (string, required)
- `shipping_state` (string, required): State/province code, e.g. MI.
- `shipping_zip` (string, required)

### `customcat_cancel_order` (~84 tokens)

Cancel an order

WRITE: 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}.

Input parameters:

- `order_id` (string, required): Your order id, exactly as sent when the order was placed.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-customcat/customcat#diagnostics

## Score history

- 2026-10-25: 62
- 2026-10-24: 62

## Common questions

### What is the CustomCat MCP by usefulapi server?

CustomCat MCP by usefulapi is listed in the public MCP registry as io.usefulapi/customcat. Browse the CustomCat catalog, your products and designs; check shipping; create and cancel orders. This page covers its hosted endpoint (https://customcat.usefulapi.io/mcp).

### Is the CustomCat MCP by usefulapi server safe to use?

CustomCat MCP by usefulapi scores 62 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the CustomCat MCP by usefulapi server expose?

CustomCat MCP by usefulapi exposes 12 tools: customcat_list_products, customcat_get_product, customcat_list_designs, customcat_list_catalog_categories, customcat_list_catalog, and 7 more. Their descriptions and schemas cost roughly 1,420 tokens of context every time the server is loaded.

### Does the CustomCat MCP by usefulapi server require authentication?

Yes. CustomCat MCP by usefulapi asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the CustomCat MCP by usefulapi server still maintained?

CustomCat MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 25 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://customcat.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/customcat/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-customcat/customcat.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-customcat/customcat.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-customcat/customcat