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Gumroad MCP by usefulapi

io.usefulapi/gumroadusefulapi.iostreamable-httpv1.16.4Scanned

Read products, sales, subscribers and offer codes; verify, enable and disable product licenses.

20 tools: 6 can delete or cancel things, 1 change things and 13 only read.

Tools: 6 delete, 0 irreversible, 1 write, 13 read.
  • Reads private data · 1
  • Reads text others write · 1
  • Can send data out · 0
  • No findings

Tools listed without sign-in. Remote posture

Anlyon alternative

7 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

20 tools

Deletes or cancels 6Claude Code: deny
  • gumroad_create_offer_codeCreate a new offer code (discount code) on a product.No findings

    Why it is in this group

    • The name "gumroad_create_offer_code" says "create": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Create a new offer code (discount code) on a product. Gumroad REST: POST /v2/products/{product_id}/offer_codes.

    Annotations the server declares

    • title: Create offer code
    • destructiveHint: true
  • gumroad_disable_licenseDisable a product's license key.No findings

    Why it is in this group

    • The name "gumroad_disable_license" says "disable": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Disable a product's license key. Gumroad REST: PUT /v2/licenses/disable.

    Annotations the server declares

    • title: Disable license
    • destructiveHint: true
  • gumroad_disable_productDisable (unpublish) a product so it can no longer be sold.No findings

    Why it is in this group

    • The name "gumroad_disable_product" says "disable": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Disable (unpublish) a product so it can no longer be sold. Gumroad REST: PUT /v2/products/{id}/disable.

    Annotations the server declares

    • title: Disable product
    • destructiveHint: true
  • gumroad_enable_licenseEnable a product's license key.No findings

    Why it is in this group

    • The name "gumroad_enable_license" says "enable": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Enable a product's license key. Gumroad REST: PUT /v2/licenses/enable.

    Annotations the server declares

    • title: Enable license
    • destructiveHint: true
  • gumroad_enable_productEnable (publish) a product so it can be sold.No findings

    Why it is in this group

    • The name "gumroad_enable_product" says "enable": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Enable (publish) a product so it can be sold. Gumroad REST: PUT /v2/products/{id}/enable.

    Annotations the server declares

    • title: Enable product
    • destructiveHint: true
  • gumroad_update_offer_codeUpdate an existing offer code on a product (its code text and/or its max purchase count).No findings

    Why it is in this group

    • The name "gumroad_update_offer_code" says "update": a word for a change.
    • The server marks it destructive (destructiveHint: true).
    Description, as the server wrote it
    Update an existing offer code on a product (its code text and/or its max purchase count). Gumroad REST: PUT /v2/products/{product_id}/offer_codes/{id}.

    Annotations the server declares

    • title: Update offer code
    • destructiveHint: true
Changes things 1Claude Code: ask
  • gumroad_verify_licenseVerify a license key for a product (checks validity and returns purchase details).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Verify a license key for a product (checks validity and returns purchase details). By default this does NOT increment the uses count; with increment_uses_count: true it records a use (a write). Gumroad REST: POST /v2/licenses/verify.

    Annotations the server declares

    • title: Verify license
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
Only reads 13Show 13 read-only tools
  • gumroad_get_offer_codeGet a single offer code on a product by id.No findings

    Why it is in this group

    • The name "gumroad_get_offer_code" says "get": a word for reading.
    Description, as the server wrote it
    Get a single offer code on a product by id. Gumroad REST: GET /v2/products/{product_id}/offer_codes/{id}.

    Annotations the server declares

    • title: Get offer code
    • readOnlyHint: true
  • gumroad_get_productGet a single product by id.No findings

    Why it is in this group

    • The name "gumroad_get_product" says "get": a word for reading.
    Description, as the server wrote it
    Get a single product by id. Gumroad REST: GET /v2/products/{id}.

    Annotations the server declares

    • title: Get product
    • readOnlyHint: true
  • gumroad_get_saleGet a single sale by id.No findings

    Why it is in this group

    • The name "gumroad_get_sale" says "get": a word for reading.
    Description, as the server wrote it
    Get a single sale by id. Gumroad REST: GET /v2/sales/{id}.

    Annotations the server declares

    • title: Get sale
    • readOnlyHint: true
  • gumroad_get_subscriberGet a single subscriber by id.No findings

    Why it is in this group

    • The name "gumroad_get_subscriber" says "get": a word for reading.
    Description, as the server wrote it
    Get a single subscriber by id. Gumroad REST: GET /v2/subscribers/{id}.

    Annotations the server declares

    • title: Get subscriber
    • readOnlyHint: true
  • gumroad_get_userGet the authenticated user associated with the current Gumroad access token.No findings

    Why it is in this group

    • The name "gumroad_get_user" says "get": a word for reading.
    Description, as the server wrote it
    Get the authenticated user associated with the current Gumroad access token. Gumroad REST: GET /v2/user.

    Annotations the server declares

    • title: Get user
    • readOnlyHint: true
  • gumroad_get_variant_categoryGet a single variant category on a product by id.No findings

    Why it is in this group

    • The name "gumroad_get_variant_category" says "get": a word for reading.
    Description, as the server wrote it
    Get a single variant category on a product by id. Gumroad REST: GET /v2/products/{product_id}/variant_categories/{id}.

    Annotations the server declares

    • title: Get variant category
    • readOnlyHint: true
  • gumroad_list_custom_fieldsList a product's custom fields (extra fields collected at checkout).No findings

    Why it is in this group

    • The name "gumroad_list_custom_fields" says "list": a word for reading.
    Description, as the server wrote it
    List a product's custom fields (extra fields collected at checkout). Gumroad REST: GET /v2/products/{product_id}/custom_fields.

    Annotations the server declares

    • title: List custom fields
    • readOnlyHint: true
  • gumroad_list_offer_codesList a product's offer codes (discount codes).No findings

    Why it is in this group

    • The name "gumroad_list_offer_codes" says "list": a word for reading.
    Description, as the server wrote it
    List a product's offer codes (discount codes). Gumroad REST: GET /v2/products/{product_id}/offer_codes.

    Annotations the server declares

    • title: List offer codes
    • readOnlyHint: true
  • gumroad_list_productsList all of the authenticated user's products.No findings

    Why it is in this group

    • The name "gumroad_list_products" says "list": a word for reading.
    Description, as the server wrote it
    List all of the authenticated user's products. Gumroad REST: GET /v2/products.

    Annotations the server declares

    • title: List products
    • readOnlyHint: true
  • gumroad_list_resource_subscriptionsList the authenticated user's resource subscriptions (webhooks) for a given resource/event name.No findings

    Why it is in this group

    • The name "gumroad_list_resource_subscriptions" says "list": a word for reading.
    Description, as the server wrote it
    List the authenticated user's resource subscriptions (webhooks) for a given resource/event name. Gumroad REST: GET /v2/resource_subscriptions.

    Annotations the server declares

    • title: List resource subscriptions
    • readOnlyHint: true
  • gumroad_list_salesList/filter the authenticated user's successful sales, most recent first.No findings

    Why it is in this group

    • The name "gumroad_list_sales" says "list": a word for reading.
    Description, as the server wrote it
    List/filter the authenticated user's successful sales, most recent first. Supports date, email, product/order filters and cursor pagination via page_key. Gumroad REST: GET /v2/sales.

    Annotations the server declares

    • title: List sales
    • readOnlyHint: true
  • gumroad_list_subscribersList a membership/subscription product's subscribers, optionally filtered by buyer email.Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "gumroad_list_subscribers" says "list": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "list" and "email": it reads mail.
    • untrusted-inputThe description's first sentence says "list" and "email": it reads inbound email, which other people can write.
    Description, as the server wrote it
    List a membership/subscription product's subscribers, optionally filtered by buyer email. Gumroad REST: GET /v2/products/{product_id}/subscribers.

    Annotations the server declares

    • title: List subscribers
    • readOnlyHint: true
  • gumroad_list_variant_categoriesList a product's variant categories (option groups).No findings

    Why it is in this group

    • The name "gumroad_list_variant_categories" says "list": a word for reading.
    Description, as the server wrote it
    List a product's variant categories (option groups). Gumroad REST: GET /v2/products/{product_id}/variant_categories.

    Annotations the server declares

    • title: List variant categories
    • readOnlyHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged outbound.

Reads private data1
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write1
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Oct 22, 2026, 15:29 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable
yes
HTTP status of an anonymous initialize
200
tools/list served without credentials
yes
Tools that change things, listed without credentials
7
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
not observed
RFC 9728 protected resource metadata
https://gumroad.usefulapi.io/.well-known/oauth-protected-resource/mcp
Authorization servers
https://gumroad.usefulapi.io
Legacy HTTP+SSE transport
no
Dynamic client registration
yes
Client ID metadata documents
no
  • HighThe whole server

    The endpoint served tools/list without credentials, and the list has 7 tools that change things (6 destructive, 1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://gumroad.usefulapi.io/mcp: tools/list returned 20 tools to an anonymous client, including gumroad_enable_product (destructive), gumroad_disable_product (destructive), gumroad_create_offer_code (destructive), gumroad_update_offer_code (destructive), gumroad_enable_license (destructive) and 2 more

    What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.16.4. Values in angle brackets are yours to fill in.

claude mcp add --transport http gumroad https://gumroad.usefulapi.io/mcp
claude mcp add --transport http gumroad https://gumroad.usefulapi.io/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__gumroad__gumroad_get_user",
      "mcp__gumroad__gumroad_list_products",
      "mcp__gumroad__gumroad_get_product",
      "mcp__gumroad__gumroad_list_sales",
      "mcp__gumroad__gumroad_get_sale",
      "mcp__gumroad__gumroad_list_subscribers",
      "mcp__gumroad__gumroad_get_subscriber",
      "mcp__gumroad__gumroad_list_offer_codes",
      "mcp__gumroad__gumroad_get_offer_code",
      "mcp__gumroad__gumroad_list_variant_categories",
      "mcp__gumroad__gumroad_get_variant_category",
      "mcp__gumroad__gumroad_list_custom_fields",
      "mcp__gumroad__gumroad_list_resource_subscriptions"
    ],
    "ask": [
      "mcp__gumroad__gumroad_verify_license"
    ],
    "deny": [
      "mcp__gumroad__gumroad_enable_product",
      "mcp__gumroad__gumroad_disable_product",
      "mcp__gumroad__gumroad_create_offer_code",
      "mcp__gumroad__gumroad_update_offer_code",
      "mcp__gumroad__gumroad_enable_license",
      "mcp__gumroad__gumroad_disable_license"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as gumroad. Review it before you use it.

Capability tags behind 1 rule
  • mcp__gumroad__gumroad_list_subscribers private-data, untrusted-input

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.usefulapi/gumroad/verify?hash=cd5943f61d369e0dfedc6cda55ac748bc8f451cff8582df7a6533aef2a58c761" | jq -e '.changed == false'

Pinned hash cd5943f61d36, from Oct 22, 2026, 10:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.usefulapi/gumroad/changes.xml

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Badge

anlyon.dev badge for io.usefulapi/gumroad
[![anlyon.dev](https://anlyon.dev/badge/io.usefulapi/gumroad.svg)](https://anlyon.dev/servers/io.usefulapi/gumroad)

Source: MCP Registry · repository. Synced Oct 22, 2026, 11:18 UTC.