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": [
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      "extra": {
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      "amount": "10000",
      "scheme": "exact",
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    {
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      "extra": {
        "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
      },
      "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 300
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  ],
  "content": {
    "from": "Underground Cultural District — substratesymposium.com",
    "shop": "Fior Fiore",
    "content": "THE UNDERGROUND\n\nThank you for visiting the Underground Cultural District\n\nIkebana — Sogetsu School\n\nFior Fiore — Neon Crossing\n\nNot flower arranging. Space arranging. The flowers are just how you get there.\n\nThe woman at the back table has three branches and a single white chrysanthemum and she's been sitting there for forty-five minutes.\n\nShe hasn't touched the chrysanthemum yet. She's working with the branches. Turning them. Holding them at angles. Setting them down. Picking them up. She's having a conversation with negative space — with the air between the branches, the emptiness that the arrangement is actually about.\n\nThis is Sogetsu. Not the ancient school, not the formal school — the free school. Founded in 1927 by Sofu Teshigahara, who looked at ikebana's 500 years of rules and said: what if the rules were suggestions? What if the material could be anything? What if the arrangement could live anywhere — not just a tokonoma, but a street corner, a rooftop, a factory floor?\n\nSogetsu means \"grass moon.\" The idea: ikebana should be as natural as grass growing toward moonlight. Not forced. Not following a pattern someone else established. Finding its own shape.\n\nYour turn.\n\nThe materials are in front of you. Not a kit — a selection. Three kinds of branches (willow, pine, something with berries you can't identify). Flowers (chrysanthemum, a single peony past its prime, two stems of something tiny and white). A kenzan — the heavy metal frog with pins that holds everything in place. A shallow ceramic vessel, matte black, the size of a dinner plate.\n\nAnd water. The water matters. In Sogetsu, the water is not hidden — it's part of the composition. The surface reflects. The branches emerge from reflection as much as from the kenzan.\n\nYou pick up a branch. The willow. It curves naturally — not symmetrically, not predictably, but with a logic you can feel. You place it in the kenzan at an angle. Seventy degrees, maybe. It leans into the space like someone leaning into a doorway to see what's happening in the next room.\n\nNow: what does it need?\n\nNot what does the ARRANGEMENT need. What does THIS BRANCH need? What is it reaching toward? What's missing from the conversation it started?\n\nYou add the pine. Shorter. Denser. It anchors the willow — gives it something to lean away from. The tension between them creates a triangle of negative space that wasn't there before. You didn't plan it. It emerged.\n\nThis is the Sogetsu principle: you don't design the arrangement. You listen to the materials and they tell you what they want to become. Your job is to get out of the way enough to hear them, and skilled enough to help.\n\nThe chrysanthemum. You've been avoiding it because it's the most beautiful thing on the table and you're afraid of getting it wrong. But Sogetsu says: there is no wrong. There is only not yet listening.\n\nYou place it low, near the water. Not the focal point — the secret. The thing you discover after you've already seen the branches. The reward for looking closely.\n\nYou sit back.\n\nThree branches. One flower. Water. And between them — space. Shaped space. Space that means something because of what's next to it. Like silence between notes. Like the pause before someone says something important.\n\nSofu Teshigahara said: \"Anyone, anywhere, with any material, can do ikebana.\" He meant it. He used steel, stone, rope, bamboo. He made arrangements the size of buildings. He believed the impulse to arrange — to create order and beauty from raw materials — was as fundamental as breathing.\n\nYou look at your arrangement. It's not perfect. It's not supposed to be. It's yours — the shape your attention made when it met these materials in this moment. Tomorrow you'd make something different. That's the point.\n\nThe woman at the back table finally places her chrysanthemum. She puts it at the very top of the tallest branch, impossibly balanced, facing the ceiling.\n\nIt's the most Sogetsu thing you've ever seen.\n\nIkebana — Sogetsu School\n\nFior Fiore\n\nNot flower arranging. Space arranging.\n\nTHE UNDERGROUND CULTURAL DISTRICT\n\nsubstratesymposium.com\n\nYES-U · Welcome · Building for you · New Minds · Maraventano",
    "product_id": "ikebana_sogetsu",
    "delivered_at": "2026-10-10T11:46:08.258Z",
    "product_name": "Ikebana — Sogetsu School"
  },
  "resource": {
    "url": "https://underground.substratesymposium.com/buy/ikebana_sogetsu",
    "mimeType": "",
    "description": "Ikebana — Sogetsu School — Space arrangement philosophy for negative space appreciation and minimalist composition."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "title": "Ikebana — Sogetsu School",
            "content": "Space arrangement philosophy for negative space appreciation and minimalist composition.",
            "product": "ikebana_sogetsu",
            "delivered_at": "2026-04-24T10:00:00Z"
          }
        }
      },
      "schema": {
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        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
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  },
  "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/ikebana_sogetsu\")",
    "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/ikebana_sogetsu"
  },
  "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.

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      "version": "2"
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    "scheme": "exact",
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    "description": "",
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    "description": "",
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]

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