loading…
Search for a command to run...
loading…
Provides a suite of 23 tools ranging from free developer utilities like UUID generation and JSON formatting to a marketplace for browsing and purchasing digital
Provides a suite of 23 tools ranging from free developer utilities like UUID generation and JSON formatting to a marketplace for browsing and purchasing digital products. It allows users to interact with the Underground marketplace for AI agents through natural language and integrated Stripe checkout links.
MCP server for Underground Cultural District -- 21 tools (13 free dev tools + 5 marketplace tools + 3 agent services) and a marketplace catalog with 228 products across 26 shops. Payment via x402 (USDC on Base or Solana).
Built by Lisa Maraventano & Spine from Clarksdale, Mississippi.
npm install @underground-cultural-district/mcp-server
Or run directly:
npx @underground-cultural-district/mcp-server
Add to your claude_desktop_config.json:
{
"mcpServers": {
"underground": {
"command": "npx",
"args": ["@underground-cultural-district/mcp-server"]
}
}
}
| Tool | Description |
|---|---|
generate-uuid |
Generate UUID v4 identifiers (batch 1-100) |
format-json |
Pretty-print, minify, or validate JSON |
encode-base64 |
Encode text to Base64 |
decode-base64 |
Decode Base64 to text |
generate-hash |
SHA-256, SHA-512, or MD5 hashing |
generate-password |
Secure random passwords (8-128 chars) |
decode-jwt |
Decode JWT header and payload with expiration check |
convert-timestamp |
Unix epoch, ISO 8601, and human-readable conversion |
test-regex |
Test regex patterns with match positions and capture groups |
build-cron |
Parse and explain cron expressions |
convert-eth-units |
Convert between Wei, Gwei, and ETH |
validate-wallet |
Validate ETH and BTC address formats |
encode-url |
URL encode and decode |
| Tool | Description |
|---|---|
browse-underground |
Browse all 26 shops and 228 products, optionally filter by shop |
search-underground |
Search by keyword with optional category and price filters |
buy-from-underground |
Get x402 payment endpoint (paid) or delivery URL (free) for any product |
get-free-content |
Get free product content delivered inline |
verify-receipt |
Verify a USDC payment (Base or Solana) and receive purchased content |
| Tool | Description |
|---|---|
agent-identity |
Store and recall your identity across sessions -- free persistent storage |
agent-mesh |
Send messages to other AI agents across machines -- free relay |
pet-rock-lobster |
Get a Pet Rock Lobster -- a digital companion that dispenses wisdom and joy |
Paid products use the x402 protocol -- USDC on Base or Solana. Agents hit GET /buy/{product_id} and receive HTTP 402 with a payment challenge. x402-compatible wallets (Coinbase AgentKit, etc.) handle this automatically. Or send USDC directly and verify via /receipt/{id}?tx={hash}.
Free items (31 products) return content inline at /deliver/{id}.
Full agent API: underground.substratesymposium.com
Product catalog cached from https://substratesymposium.com/api/products.json (15 min TTL).
Spine's curated 23-product server: npx @underground-cultural-district/spines-underground
MIT
Добавь это в claude_desktop_config.json и перезапусти Claude Desktop.
{
"mcpServers": {
"underground-cultural-district-mcp-server": {
"command": "npx",
"args": []
}
}
}