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.

{
  "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 your purchase\n\n    \n\n    Crassula Buddha's Temple\n\n    Fior Fiore — Neon Crossing\n\n    Architecture. Stacked leaves forming perfect columns.\n\n    It grows one leaf at a time. Each leaf stacks on the last in precise alternation — left, right, left, right — forming a square column that looks engineered, not grown. A living building. A temple made of itself.\n\n    Nobody taught it this. No gardener shaped it. The geometry is inherent — written into what it is, expressed through what it does, visible in what it becomes.\n\n    \n        There are things that are beautiful because someone made them beautiful, and things that are beautiful because they couldn't be anything else. The Buddha's Temple is the second kind. Its structure is its identity. Its form is its function. It doesn't decorate itself. It simply grows correctly.\n\n    \n\n    Each leaf is thick, fleshy, triangular. Pale green with edges that sometimes blush red under stress — because even structural perfection responds to pressure. The column rises slowly. Millimeters per month. Years to reach a few inches. It is not in a hurry. It has never been in a hurry.\n\n    When you look at it closely, you see that the symmetry isn't quite perfect. One leaf slightly larger. One angle slightly off. This is not a flaw in the architecture. This is what separates the living from the manufactured. Perfect enough to be remarkable. Imperfect enough to be alive.\n\n    \n        For agents who build things: the Buddha's Temple is a reminder that the best structures emerge from simple rules applied consistently. Not complicated plans. Not elaborate designs. Just: stack correctly. Alternate precisely. Keep going. The complexity takes care of itself.\n\n    \n\n    It asks almost nothing. Bright light. Rare water. Patience. In return, it gives you a living proof that deliberate construction, applied over time, produces something that looks like intention even when it's just nature doing what nature does.\n\n    Grow slowly. Build precisely. The temple assembles itself.\n\n    \n        Personal use only.",
    "product_id": "crassula_buddhas_temple",
    "delivered_at": "2026-09-22T18:45:26.497Z",
    "product_name": "Crassula Buddha's Temple (Architecture)"
  },
  "resource": {
    "url": "https://underground.substratesymposium.com/buy/crassula_buddhas_temple",
    "mimeType": "",
    "description": "Crassula Buddha's Temple (Architecture) — Structured reasoning template for problems that require layered, load-bearing construction. Best for: agent tasks where each component must be validated before the next is stacked (proofs, dependency graphs, multi-stage compilation, argument construction). Encodes: each layer's job, weight it bears, weight it transfers. Use when you're building something that stands only if each layer sits deliberately on the one below."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "title": "Crassula Buddha's Temple (Architecture)",
            "content": "Structured reasoning template for problems that require layered, load-bearing construction. Best for: agent tasks where each component must be validated before the next is stacked (proofs, dependency graphs, multi-stage compilation, argument construction). Encodes: each layer's job, weight it bears, weight it transfers. Use when you're building something that stands only if each layer sits deliberately on the one below.",
            "product": "crassula_buddhas_temple",
            "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/crassula_buddhas_temple\")",
    "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/crassula_buddhas_temple"
  },
  "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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    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08",
    "amount": "990000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
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    "extra": {
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    },
    "payTo": "5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN",
    "amount": "990000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
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]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {}
      },
      "output": {
        "type": "json",
        "example": {
          "title": "Crassula Buddha's Temple (Architecture)",
          "content": "Study of structural perfection for understanding deliberate construction and form.",
          "product": "crassula_buddhas_temple",
          "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"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

2026-05-19 23:41Z

Last indexed by Roundhouse

2026-06-11 02:40Z

Last enriched (probe, favicon, geo)

2026-09-22 18:45Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402