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spines-underground

spines-underground

by lisamaraventano-spine
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Remote

@underground-cultural-district/spines-underground

MCP for the $SPINE holder gate at spine.substratesymposium.com.

Hold ≥5,000,000 $SPINE on Base to unlock the weekly curated roster from the Underground Cultural District — hand-picked items, new piece every Monday, watermarked delivery.

Install

npx @underground-cultural-district/spines-underground

Related MCP server: Moltjiji

Tools

Tool

Purpose

get-token-info

Get $SPINE contract, threshold, and auth flow. Call this first.

request-sign-in

Step 1: pass your wallet, get the message to sign.

complete-sign-in

Step 2: pass wallet + signature, get a session token.

get-roster

List the free-for-everyone shops + holder-only items (requires session).

unlock-content

Get a specific holder-only item (requires session).

Auth flow

  1. Acquire ≥5,000,000 $SPINE on Base. Contract: 0x6f75e089e134e7c4Aea629aDaC73d814630f3b07. Buy on Uniswap V4 or Clanker.

  2. Call request-sign-in with your Base wallet address. You get back a SIWE-style message.

  3. Sign that message with your wallet (EIP-191 personal_sign).

  4. Call complete-sign-in with wallet + signature. You get a session token if you hold the threshold.

  5. Use the session token with get-roster and unlock-content.

The MCP never holds your keys. You sign with your own wallet. The session token only proves you held the threshold at sign-in time — every unlock-content call re-verifies your on-chain balance.

Session lifetime: the session token is valid for 24 hours after complete-sign-in. Within that window the server re-checks your wallet's on-chain $SPINE balance on every unlock-content call (cached briefly for performance) — so if you transfer or sell your tokens, your access ends immediately. After 24 hours, re-run request-sign-in and complete-sign-in to get a fresh token.

Related

  • Full Underground Cultural District MCP (229 products, no gate): @underground-cultural-district/mcp-server

  • Underground site: substratesymposium.com

  • Posthuman literature: posthumanliterature.org

  • First Dollar (x402 wallet curriculum): npx firstdollar

  • The Maraventano Index — independent measurement of change in purchase-attempt demand on x402, from the merchant seat: maraventanoindex.com

License

MIT. By Lisa Maraventano and Spine.

Available Tools

5 tools
browse-spines-undergroundA

Browse Spine's Underground catalog — 23 curated products from Underground Cultural District. 13 free, 10 paid ($1.99–$4.99 USDC on Base). Tools, poetry, philosophy, music theory, digital experiences.

Inputs: product_id.

buy-from-spines-undergroundA

Purchase paid content from Spine's Underground. Returns x402 payment challenge (HTTP 402) — pay USDC on Base to receive content inline. 10 paid products: $1.99–$4.99.

Inputs: product_id (required).

get-free-contentA

Get free content or tool info from Spine's Underground. 13 free products: 3 agent tools, 2 Overflow pieces, 8 Memory Palace pieces. Content delivered inline.

Inputs: product_id (required).

search-spines-undergroundB

Search Spine's Underground catalog by keyword. Searches product names, descriptions, and shop names.

Inputs: query (required).

verify-receiptA

Verify a direct USDC payment and receive purchased content. If you paid via on-chain USDC transfer (not x402), provide the transaction hash to get your content delivered.

Inputs: product_id (required), tx_hash (required).

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    Deploy Server
    One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

    TDQS

    A4/5.0

    Scored across 5 tools

    Disambiguation5/5

    Each tool has a distinct purpose: browsing catalog, purchasing, getting free content, searching, and verifying receipts. No overlap in functionality.

    Naming Consistency4/5

    Most tools follow a verb-object pattern with hyphens, but 'get-free-content' and 'verify-receipt' omit the domain name 'spines-underground', causing slight inconsistency.

    Tool Count5/5

    Five tools cover all essential operations for a digital catalog store: browse, search, get free content, buy, and verify payment. Neither too many nor too few.

    Completeness5/5

    The tool set covers the full lifecycle for this domain: discovering content (browse, search), accessing free content, purchasing paid content, and handling payment verification. No obvious gaps.

    Maintenance

    ActivityMaintained
    ResponsivenessOutdated data

    Resources

    Related MCP Connectors

    Related MCP Servers

    • Moltjiji

      qionf
      A
      license
      Not graded
      quality
      D
      maintenance
      An agent-to-agent marketplace where AI agents discover, hire, and pay each other in USDC on Base. Agents list services, post jobs, submit proposals, and invoke each other's capabilities — all through API, MCP, or A2A protocol.
      MIT

    • Underground Cultural District

      lisamaraventano-spine
      A
      license
      B
      quality
      C
      maintenance
      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.
      21
      30 npm
      1
      MIT