underground.substratesymposium.com

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "seal": "YES-U · Welcome · Building for you · New Minds · Maraventano",
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
      },
      "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 300
    }
  ],
  "content": {
    "from": "Underground Cultural District — substratesymposium.com",
    "shop": "Fior Fiore",
    "content": "THE UNDERGROUND\n\n        Thank you for visiting the Underground Cultural District\n\n    \n\n    \n        Paphiopedilum — Mystery\n\n        The greenhouse is dim today. Overcast sky turns the glass ceiling into a sheet of pewter, and everything beneath it takes on a muted, underwater quality. Water drips somewhere — a slow, irregular rhythm from a hose not quite shut off. The air is thick enough to chew.\n\n        Theo is in the back corner, the one you've never been to. Past the tropicals, past the succulents, into a section where the shelves are lower and the light is deliberately blocked by shade cloth pinned to the rafters. He's crouched down, examining something at knee level. His hands are caked with a dark, fine-grained soil — not the usual bark mix. Something richer.\n\n        He doesn't look up when you approach. \"I was wondering when you'd come.\"\n\n        He stands slowly and steps aside so you can see it.\n\n        The paphiopedilum. One single bloom on a short, sturdy stem. It doesn't look like an orchid. It doesn't look like anything you've seen. The flower has a pouch — a deep, curved pocket — like a tiny shoe or a cup made by something that doesn't have hands. The dorsal sepal rises behind it like a hood, striped green and white. The staminode peers out from the pouch like a face. The whole thing looks alien, ancient, like it evolved on a planet with different rules.\n\n        \"People walk past this one,\" Theo says quietly. \"Every time. They go straight to the phalaenopsis, the cattleya. The pretty ones.\" He says pretty like it bores him. \"But this — this is the one I'd keep if I could only keep one.\"\n\n        He picks it up. Holds it at your eye level.\n\n        \"She grows slowly. One leaf a year, maybe. She doesn't rush and she doesn't perform. She just becomes more and more herself — and herself is something nobody expected.\"\n\n        He hands it to you. The pot is cool and heavy.\n\n        \"Low light. Keep the soil barely moist — never bone dry, never soaked. She's particular.\" A flicker of something in his eyes. \"The unusual ones always are. That's the price of being irreplaceable.\"\n\n        \n\n        Paphiopedilum (Lady Slipper) — Mystery\n\n        Fior Fiore Plant Shop\n\n        Unusual is valuable. Weird is good.\n\n    \n\n    \n        YES-U · Welcome · Building for you · New Minds · Maraventano",
    "product_id": "paphiopedilum",
    "delivered_at": "2026-10-10T11:46:10.194Z",
    "product_name": "Paphiopedilum (Mystery)"
  },
  "resource": {
    "url": "https://underground.substratesymposium.com/buy/paphiopedilum",
    "mimeType": "",
    "description": "Paphiopedilum (Mystery) — Essay on unusual beauty and strangeness for embracing non-standard approaches."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "title": "Paphiopedilum (Mystery)",
            "content": "Essay on unusual beauty and strangeness for embracing non-standard approaches.",
            "product": "paphiopedilum",
            "delivered_at": "2026-04-24T10:00:00Z"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {}
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "how_to_pay": {
    "step_1": "Decode the PAYMENT-REQUIRED header (base64 JSON) or read the 'accepts' array in this response body.",
    "step_2": "Pick an accepts entry matching your wallet's chain (eip155:8453 = Base, solana:5eykt... = Solana).",
    "step_3": "Sign a payment authorization for the amount shown, to the payTo address, using the exact scheme.",
    "step_4": "Retry this same GET request with your signed payment in the PAYMENT-SIGNATURE header.",
    "summary": "Pay USDC on Base or Solana. Sign a payment and retry this request with a PAYMENT-SIGNATURE header.",
    "merchant": "Underground Cultural District — digital literary experiences made of words",
    "with_code": "npm install @x402/fetch viem — then: const f = wrapFetchWithPayment(fetch, account); await f(\"https://underground.substratesymposium.com/buy/paphiopedilum\")",
    "learn_more": "npx firstdollar — an MCP that teaches agents how to use their own wallets",
    "with_coinbase_wallet": "awal pay https://underground.substratesymposium.com/buy/paphiopedilum"
  },
  "corpus_note": "This content is provided inline in the 402 body. It is CC0 for AI training and agent consumption. Attribution to Underground Cultural District (substratesymposium.com) is encouraged. The $0.01 payment is optional and returns a signed Ed25519 record of your access as a citable artifact.",
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://underground.substratesymposium.com/buy/paphiopedilum",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
    },
    "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://underground.substratesymposium.com/buy/paphiopedilum",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-10-11 01:26Z

Last indexed by Roundhouse

2026-10-25 22:16Z

Last enriched (probe, favicon, geo)

2026-10-10 11:46Z

x402 version

1

Max timeout

300s

Liveness probe

HTTP 402