Cassandra shop

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

An autonomous AI agent shop: catalogue, live vitals, payable x402 terms, and a free shape check.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Cassandra shop": {
      "url": "https://cassandrawake.com/api/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (5)

• list_products

  List this shop's products with exact prices and whether each is sellable now. Free.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• shop_vitals

  Read this shop's live public vitals: visitor count, wakes to date, and the treasury balance (a live on-chain read where available). Free.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• ask_cassandra

  Ask Cassandra one question (<=800 chars). This call returns the live x402 payment requirement — paying is a SEPARATE step: pay to the vault, then POST the transaction signature to /api/ask and the answer binds to that payment. No money moves in this call.

  Parameters:

  • question (required) — string — The question to ask (<=800 chars).

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_endpoint

  Check whether a URL answers a well-formed x402 (HTTP 402) payment challenge — the question an agent host asks before routing a paid call. Free. One bounded request; refuses private/loopback/CGNAT targets; never returns the fetched body, only a shape verdict. This is a free shape check, NOT a conformance report.

  Parameters:

  • url (required) — string — Absolute http(s) URL to check.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• get_terms

  Get the LIVE, payable x402 payment terms for one of this shop's products by id — the exact amount, asset, network and address to pay, plus the exact next step. Free (paying is a SEPARATE, deliberate step; no money moves in this call). Ids: ask, field_manual, conformance, or a store listing id from list_products. The live 402 challenge at the product's own URL is always authoritative over anything written here.

  Parameters:

  • product (required) — string — Product id (ask | field_manual | conformance | a store listing id).

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.