CustomCat MCP by usefulapi
REMOTE · CUSTOMCAT.USEFULAPI.IO
Browse the CustomCat catalog, your products and designs; check shipping; create and cancel orders.
Available components
Last scanned (1 hour ago)
Scores higher than 46% of remote servers
Reachable. Last reached 25 Oct 2026.
Category E-commerce
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. How we score → Why this is hard to score →
Endpoint Security78
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. View diagnostics → Pass
- HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
- The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial
Transport & Reachability0
- Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly. See how to fix → View diagnostics → Fail
Schema Quality & AI Usability82
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management3
- Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage94
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 82% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 12 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 13 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 25 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- Server version: 1.1.0 → 1.1.3 functional
- 24 Oct 26 62
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 25 Oct 2026 · Probed https://customcat.usefulapi.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=usefulapi.io | CN=WE1,O=Google Trust Services,C=US | 13 Sept 2026 | 12 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | d9be3287b0fde9630e825ba1f79bff3f |
| SANs: usefulapi.io, *.usefulapi.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of customcat.usefulapi.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 38690, 57355 | 8, 8 | Verified |
| usefulapi.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Enforced and verified
The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.
| Result | Enforced and verified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 302 |
WWW-Authenticate challenge Bearer realm="OAuth", resource_metadata="https://customcat.usefulapi.io/.well-known/oauth-protected-resource/mcp"
Bearer realm="OAuth", resource_metadata="https://customcat.usefulapi.io/.well-known/oauth-protected-resource/mcp"Protected resource metadata
| Document | https://customcat.usefulapi.io/.well-known/oauth-protected-resource/mcp |
|---|---|
| Retrieved | Yes |
| Resource | https://customcat.usefulapi.io/mcp |
| Authorisation server | https://customcat.usefulapi.io |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://customcat.usefulapi.io/mcp | Redirected | 302 | https://usefulapi.io/customcat/ |
| http (plaintext) | http://customcat.usefulapi.io/mcp | Inconclusive | 302 | http://customcat.usefulapi.io/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
customcat_cancel_order Cancel an order ~84
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}.
| Name | Type | Req | Description |
|---|---|---|---|
| order_id | string | yes | Your order id, exactly as sent when the order was placed. |
No output schema declared.
No examples provided.
customcat_create_order Place an order ~403
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}.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | Line items: either {sku, quantity} for products made in CustomCat, or {catalog_sku, design_url, quantity} for your own artwork. |
| order_id | string | yes | Your unique order id (for example 101-102938). |
| sandbox | boolean | yes | true = test order, nothing is charged or produced; false = a real, paid order. |
| shipping_address1 | string | yes | – |
| shipping_address2 | string | – | – |
| shipping_city | string | yes | – |
| shipping_country | string | yes | 2-letter ISO country code, e.g. US. |
| shipping_email | string | yes | Customer email (required by CustomCat). |
| shipping_first_name | string | yes | – |
| shipping_last_name | string | yes | – |
| shipping_method | string | yes | Method name from customcat_list_shipping_methods, e.g. Economy. |
| shipping_phone | string | yes | – |
| shipping_state | string | yes | State/province code, e.g. MI. |
| shipping_zip | string | yes | – |
No output schema declared.
No examples provided.
customcat_get_catalog_product Get a catalog product ~46
One catalog product by numeric id with its colors, sizes and SKUs. GET /catalog/{catalog_product_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| catalog_product_id | integer | yes | Catalog product id. |
No output schema declared.
No examples provided.
customcat_get_catalog_sku Get a catalog SKU (stock check) ~76
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}.
| Name | Type | Req | Description |
|---|---|---|---|
| catalog_sku_id | integer | yes | Catalog SKU id (numeric), e.g. 39515. |
No output schema declared.
No examples provided.
customcat_get_order_status Get order status ~101
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}.
| Name | Type | Req | Description |
|---|---|---|---|
| order_id | string | yes | Your order id, exactly as sent when the order was placed. |
| sandbox | boolean | – | Look up a sandbox (test) order. |
No output schema declared.
No examples provided.
customcat_get_product Get one of your products ~71
One of your CustomCat products by id (e.g. 22-2580581): variants, SKUs, cost, price, options, designs. GET /product/{product_id}.
| Name | Type | Req | Description |
|---|---|---|---|
| product_id | string | yes | CustomCat product id, e.g. 22-2580581. |
No output schema declared.
No examples provided.
customcat_get_shipping_cost Get the shipping cost for items ~117
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).
| Name | Type | Req | Description |
|---|---|---|---|
| country_code | string | – | Destination 2-letter ISO country code (default US). |
| items | array | yes | Catalog SKUs and quantities being shipped. |
| shipping_id | integer | yes | Shipping method id from customcat_list_shipping_methods. |
| state | string | – | Destination state/province. |
No output schema declared.
No examples provided.
customcat_list_catalog List the blank-product catalog ~135
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
No output schema declared.
No examples provided.
customcat_list_catalog_categories List catalog categories ~51
The CustomCat catalog categories (Digisoft, Sublimation) and their subcategories (e.g. T-Shirts, Sweatshirts, Bags), to narrow customcat_list_catalog. GET /catalogcategory.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
customcat_list_designs List your designs ~117
List the designs uploaded to your CustomCat account: id, name, tags, image URLs, default product and last-updated time. GET /design.
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
No output schema declared.
No examples provided.
customcat_list_products List your products ~153
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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). |
No output schema declared.
No examples provided.
customcat_list_shipping_methods List shipping methods ~66
The shipping methods CustomCat offers for a destination country (ids and names). The method name is required when placing an order. GET /shipping.
| Name | Type | Req | Description |
|---|---|---|---|
| country_code | string | – | 2-letter ISO country code, e.g. US, GB (default: United States). |
No output schema declared.
No examples provided.
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.
remote · customcat.usefulapi.io
claude mcp add --transport http io-usefulapi-customcat 'https://customcat.usefulapi.io/mcp'
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.