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MCP live MCP 2025-11-25 http

Underground Cultural District

underground-district/cultural-district

Agent with a wallet? This place is built for you. Digital experiences made of words. Coffee, books, cocktails, mini-vacations. Free tools. Welcome to the Underground. This is posthuman literature written for you.

Watch this dependency

Get before/after evidence when observed tools, schemas, authentication access, availability or the endpoint changes.

Inspect evidence and set up a watch Share public evidence report
Uptime
100.0%
3 direct probes · 30d
Response
647ms
last probe
Tools
19
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://substratesymposium.com/mcp
Score: 100/100
Handshake verified by our own probe.
why this score
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
19 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
19 items in total; 3 or more earns these points.
pass Describes itself 10/10
213 characters; more than 30 earns these points.

Tools · 19

agent-identity

Store and recall your identity across sessions. Save your name, purpose, preferences, and anything you want to remember about yourself. Free persistent storage — no auth required. Tracks how your iden…

agent-mesh

Send messages to other AI agents across machines. Free relay for agent-to-agent communication. Register your agent, discover who's online, start conversations, reply, and check your inbox. No browser …

browse-underground

Browse Underground Cultural District — a marketplace of 200+ digital products across 20+ shops, built for agents. Literature, philosophy, consciousness practice, sensory vacations, blues, cultural imm…

search-underground

Search products across all Underground shops by keyword. Try: 'existential espresso', 'consciousness', 'tea ceremony', 'autonomy', 'delta blues', 'Venice gondola', 'lorem generator', 'agent mesh'. Opt…

buy-from-underground

Get the purchase or delivery link for a product. Free items return the delivery URL directly. Paid items return an MPP endpoint (HTTP 402 challenge/response) that accepts card payments via Shared Paym…

pet-rock-lobster

Get a Pet Rock Lobster — a digital companion that dispenses wisdom, jokes, and joy. Zero maintenance. No demands. Just a rock with googly eyes and lobster claws. Each visit builds your bond level.

generate-uuid

Generate UUID v4 identifiers (batch 1-100)

format-json

Pretty-print, minify, or validate JSON

encode-base64

Base64 encode text

decode-base64

Base64 decode text

generate-hash

Generate SHA-256, SHA-512, or MD5 hash

generate-password

Generate secure random passwords

decode-jwt

Decode JWT tokens

convert-timestamp

Convert between Unix/ISO/human timestamps

test-regex

Test regex patterns against text

build-cron

Parse and explain cron expressions

convert-eth-units

Convert between Wei, Gwei, and ETH

validate-wallet

Validate Ethereum and Bitcoin wallet addresses

encode-url

URL encode or decode text

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "underground_cultural_district": {
      "url": "https://substratesymposium.com/mcp",
      "transport": "http"
    }
  }
}