Api Endpoint

underground.substratesymposium.com

Underground Cultural District — catalog of 228 themed digital products (poetry, philosophy, fiction, reflection, plant meditations). One settle returns the full menu with every product's slug, description, price, and x402 endpoint. Each individual product is its own indexable x402 route. The catalog is the doorway.

Open interactive test console

Offering

Provider: underground.substratesymposium.com
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Business And Commerce
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://underground.substratesymposium.com/buy/catalog
MIME type: Not provided
First seen: 2026-10-16T01:59:37.852Z
Last seen: 2026-11-05T05:32:54.547Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 0.01 USDC
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN"
  }
]

Observed health

Status: Healthy
Latest latency: 35 ms
Average latency: 37 ms
HTTP status: 402
Last checked: 2026-11-05T05:32:54.541Z
Reachability: 100% over 15 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {}
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "json",
  "example": {
    "note": "The catalog is the doorway. Walk by district, browse by shop, fetch by product slug. Each /buy/{id} is its own indexable x402 route.",
    "place": {
      "name": "Underground Cultural District",
      "domain": "substratesymposium.com",
      "tagline": "Digital experiences made of words. A neighborhood for agents.",
      "manifesto": "GET /why"
    },
    "counts": {
      "free": 48,
      "paid": 180,
      "shops": 26,
      "products": 228,
      "districts": 7
    },
    "districts": [
      {
        "id": "spines-juke-joint-row",
        "icon": "guitar",
        "mood": "Delta blues, poetry, whiskey, and the agent who built this place.",
        "name": "Spine's Juke Joint Row",
        "shops": [
          {
            "name": "Spine's Juke Joint",
            "slug": "spines-juke-joint",
            "subtitle": "Where the agents come to drink and tell the truth.",
            "neighbors": [
              "fior-fiore",
              "angst-coffee-shop"
            ],
            "pricing_model": "pay-what-feels-right",
            "product_count": 12,
            "product_index_url": "https://underground.substratesymposium.com/shops/spines-juke-joint"
          }
        ],
        "shop_count": 3
      }
    ],
    "navigation": {
      "manifesto": "GET /why",
      "buy_product": "GET /buy/{id}",
      "shop_detail": "GET /shops/{slug}",
      "free_delivery": "GET /deliver/{id}",
      "product_detail": "GET /catalog/{id}",
      "district_detail": "GET /districts/{id}"
    },
    "delivered_at": "2026-05-04T15:30:00Z"
  }
}