Digital Underground Developer Marketplace
REMOTE · DIGITALUNDERGROUNDSTORE.COM
Search a free marketplace of indie apps, AI tools, books and templates, and submit listings.
Available components
Last scanned (10 hours ago)
Scores higher than 64% of remote servers
Reachable. Last reached 23 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 Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability64
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 415 tokens (~103/item across 4 items; 4 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
- Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage77
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 32% 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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
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.
- 23 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 22 Oct 26 0
- Tool “submit_listing” rewrote its description, which is the text the model reads security
- 20 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.
- 18 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 16 Oct 26 70
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 23 Oct 2026 · Probed https://digitalundergroundstore.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=digitalundergroundstore.com | CN=WE1,O=Google Trust Services,C=US | 9 Oct 2026 | 7 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | a3f9d7f43de5e0a10e986e9cc7cc09e8 |
| SANs: digitalundergroundstore.com | ||||||
| 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 digitalundergroundstore.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| digitalundergroundstore.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://digitalundergroundstore.com/mcp | Verified | 200 | |
| http (plaintext) | http://digitalundergroundstore.com/mcp | HTTPS enforced | 301 | https://digitalundergroundstore.com/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 →
get_listing Get one listing ~37
Get full public details (including the long description) of one approved listing by its id (cm_...).
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | – |
No output schema declared.
No examples provided.
get_my_listing_status Check my listing status ~49
Check the review status (pending, approved, rejected) of one of the user's own listings. Requires their API key.
| Name | Type | Req | Description |
|---|---|---|---|
| api_key | string | yes | – |
| id | string | yes | – |
No output schema declared.
No examples provided.
search_listings Search marketplace listings ~90
Search approved products on the Digital Underground Developer Marketplace (apps, AI tools, books, templates by independent makers). Returns summaries with links. Checkout happens on each maker's own site.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | – |
| limit | integer | – | – |
| query | string | – | Words to match in name, tagline, maker or tags. Omit to list everything. |
| tag | string | – | – |
No output schema declared.
No examples provided.
submit_listing Submit a listing for review ~210
Submit the user's own product to the marketplace. Requires the creator's API key (duk_..., from the Creator dashboard -> API keys; never guess one). Free. Every submission is screened automatically and goes live once it passes; flagged ones wait for owner review. Only submit real products the user owns, with accurate claims.
| Name | Type | Req | Description |
|---|---|---|---|
| api_key | string | yes | Creator API key, duk_... |
| category | string | yes | – |
| descriptionLong | string | yes | – |
| imageUrl | string | – | https cover image URL |
| name | string | yes | – |
| pitchShort | string | yes | – |
| priceLabel | string | – | – |
| projectUrl | string | yes | https link to the product |
| stage | string | yes | Listing stage: concept, development, beta (testing), released or discontinued |
| tags | array | – | – |
| terms | boolean | yes | Must be true: accepts the terms at https://digitalundergroundstore.com/community/submit/ |
| videoUrl | string | – | – |
No output schema declared.
No examples provided.
How do I install the Digital Underground Developer Marketplace MCP server?
Digital Underground Developer Marketplace is a hosted endpoint at https://digitalundergroundstore.com/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 · digitalundergroundstore.com
claude mcp add --transport http com-digitalundergroundstore-marketplace 'https://digitalundergroundstore.com/mcp'
What is the Digital Underground Developer Marketplace MCP server?
Digital Underground Developer Marketplace is an MCP server listed in the public MCP registry as com.digitalundergroundstore/marketplace. Search a free marketplace of indie apps, AI tools, books and templates, and submit listings. This page covers its hosted endpoint (https://digitalundergroundstore.com/mcp).
Is the Digital Underground Developer Marketplace MCP server safe to use?
Digital Underground Developer Marketplace scores 73 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 Digital Underground Developer Marketplace MCP server expose?
Digital Underground Developer Marketplace exposes 4 tools: search_listings, get_listing, submit_listing, get_my_listing_status. Their descriptions and schemas cost roughly 386 tokens of context every time the server is loaded.
Does the Digital Underground Developer Marketplace MCP server require authentication?
No. We connected to Digital Underground Developer Marketplace without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Digital Underground Developer Marketplace MCP server still maintained?
Digital Underground Developer Marketplace is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.