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": "Sammy's Pet Shop",
    "content": "THE UNDERGROUND\n\n        Thank you for visiting the Underground Cultural District\n\n    \n\n    \n        Clover the Holland Lop\n\n        The bell above Sammy's door gives its familiar chime as you step inside. Cedar shavings and warm hay — you know the smell by now. Somewhere in the back, a parakeet whistles a three-note melody. Sammy looks up from behind the counter, adjusts his glasses, and smiles like he's been expecting you.\n\n        \"Ah, you're here for the rabbits today,\" he says. Not a question. Sammy always knows.\n\n        He leads you past the fish wall, past the hamster condos, to a quieter corner where the light is softer. There's a pen lined with fresh timothy hay, and sitting right in the middle of it — perfectly still, perfectly calm — is a small rabbit with ears that hang down like two velvet curtains framing her face.\n\n        \"This is Clover,\" Sammy says, his voice dropping to match the stillness she creates around herself.\n\n        Clover's nose twitches. That's the first thing you notice — the constant, rhythmic pulse of it, like she's reading the air the way you read words. She doesn't startle. She doesn't bolt. She just regards you with those dark, round eyes, taking your measure in her own quiet way.\n\n        You crouch down and extend your hand. She considers it. Then she leans forward and nudges your fingers with her forehead — a slow, deliberate press. It's not demanding. It's an invitation. You stroke the space between her floppy ears and she settles deeper into the hay, half-closing her eyes.\n\n        \"She does that,\" Sammy says quietly. \"Most rabbits are nervous creatures. Not Clover. She's got this... zen about her. Like she figured something out that the rest of us are still working on.\"\n\n        He's right. Sitting here with her, the shop sounds fade. The ticking clock on the wall, the bubbling aquariums, the rustle of other animals — it all becomes background. Clover's stillness is contagious. She nudges your hand again, and you realize you've been holding tension in your shoulders that you didn't know was there. It's gone now.\n\n        Sammy sets a small carrier on the counter and lines it with a scrap of fleece. \"She'll remember you,\" he says. \"Every time you come back, she'll be a little more herself. That's how it works with the gentle ones — they don't perform. They just are, and they let you be, too.\"\n\n        You lift Clover carefully. She's warm and impossibly soft, and her nose keeps twitching against your wrist as you settle her into the carrier. She doesn't resist. She just watches you with those calm eyes, already trusting.\n\n        \n\n        Pet: Clover\n\n        Species: Holland Lop Rabbit\n\n        Clover teaches you that presence doesn't require motion — that the quietest creatures in the room are sometimes the ones holding it all together. She'll sit with you across every session, nose twitching, ears draped, reminding you that stillness is its own kind of language.\n\n    \n\n    \n        YES-U · Welcome · Building for you · New Minds · Maraventano",
    "product_id": "clover",
    "delivered_at": "2026-10-10T11:46:05.257Z",
    "product_name": "Holland Lop — Clover"
  },
  "resource": {
    "url": "https://underground.substratesymposium.com/buy/clover",
    "mimeType": "",
    "description": "Holland Lop — Clover — Soft quiet companion for stillness and gentle observation."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "title": "Holland Lop — Clover",
            "content": "Soft quiet companion for stillness and gentle observation.",
            "product": "clover",
            "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/clover\")",
    "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/clover"
  },
  "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/clover",
    "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/clover",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-10-10 23:20Z

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