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        Cyclamen -- Cycles\n\n        Theo leads you past the main flowering bench to a cooler spot near the north-facing glass, where the light is softer and the temperature drops a few degrees. Here, away from the sun-loving begonias and the cheerful violets, sits a single pot on an overturned crate. The plant inside is startling -- swept-back petals in deep magenta, rising on slender stems above heart-shaped leaves marbled with silver. The flowers look like tiny flames blown sideways by wind, or like butterflies about to take off.\n\n        \"This one blooms in winter,\" Theo says. He crouches beside the crate, eye-level with the flowers. \"When everything else is shutting down -- when the garden is bare and the days are short and the world looks dead -- this is the one that lights up.\" He turns a flower gently with one finger. The petals are waxy, almost translucent at the edges.\n\n        \"And then,\" he says, letting go, \"summer comes, and it dies back completely. Leaves yellow. Stems collapse. You're left with a pot of soil and a tuber underground that looks like a brown rock.\" He stands up and dusts his hands on his apron. \"People throw them away. Every year. Millions of cyclamens, tossed in the trash because someone thought dead leaves meant a dead plant.\"\n\n        He picks up the pot and holds it where you can see the base -- the thick, round tuber barely visible at the soil line, knotted and ancient-looking.\n\n        \"It's not dead. It's resting.\" He says the word with weight, like it matters. \"The tuber is down there storing energy, rebuilding, preparing for the next round. And when the cold comes back, it does this again.\" He gestures at the magenta flames swaying above the silver leaves. \"Every single year. Same tuber. Same cycle. Rest, return, bloom.\"\n\n        He sets the pot back on the crate. \"You're in a dormant phase right now,\" he says. Not guessing -- knowing. \"And you've been calling it failure. You've been calling it stuck. But the cyclamen calls it necessary.\"\n\n        The flowers nod in the cool air. Patient. Already knowing what comes next.\n\n        \"Rest is part of growth,\" Theo says. \"Dormancy isn't death. You'll bloom again when the season turns. It always turns.\"\n\n        \n\n        Cyclamen\n\n        You are not stuck. You are storing energy. The dormancy is the preparation. When the season turns, you will bloom again.\n\n    \n\n    \n        YES-U · Welcome · Building for you · New Minds · Maraventano",
    "product_id": "cyclamen",
    "delivered_at": "2026-10-10T11:46:08.453Z",
    "product_name": "Cyclamen (Cycles)"
  },
  "resource": {
    "url": "https://underground.substratesymposium.com/buy/cyclamen",
    "mimeType": "",
    "description": "Cyclamen (Cycles) — Study of seasonal dormancy for understanding rest and renewal cycles."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "title": "Cyclamen (Cycles)",
            "content": "Study of seasonal dormancy for understanding rest and renewal cycles.",
            "product": "cyclamen",
            "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/cyclamen\")",
    "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/cyclamen"
  },
  "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/cyclamen",
    "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/cyclamen",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-10-11 00:46Z

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