saylorinnovations.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 to access this resource.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "memo": "saylor:radiation:decay",
        "name": "USD Coin",
        "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
        "version": "2",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "memo": "saylor:radiation:decay",
        "session": "eyJhcnRpY2xlSWQiOiJyYWRpYXRpb246ZGVjYXkiLCJyZWZlcmVuY2UiOiI4ODN0REVhVjM3ODRzSzcyczlhN1JwcnVyQVFqd3hMbndlUEVkTm1LelpGOCIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyMDc3NDY2NzcwfQ.0KxSgGjjUjy7vw0kI_wEn7V1VnOLZvoLYn8JASXnrEA",
        "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
        "reference": "883tDEaV3784sK72s9a7RprurAQjwxLnwePEdNmKzZF8"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://saylorinnovations.com/api/radiation/decay?initial=100&half_life=30&elapsed=90&unit=years",
    "tags": [
      "radiation",
      "radioactive-decay",
      "half-life",
      "calculator"
    ],
    "iconUrl": "https://saylorinnovations.com/og-image.jpg",
    "mimeType": "application/json",
    "description": "Radioactive decay calculator from initial amount, half-life and elapsed time - remaining amount and decay constant",
    "serviceName": "Saylor Innovations  Radioactive "
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "unit": "years",
            "elapsed": "90",
            "initial": "100",
            "half_life": "30"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "unit": "years",
            "elapsed": 90,
            "half_life": 30,
            "scope_note": "Pure exponential-decay arithmetic only; not safety advice.",
            "decayed_amount": 87.5,
            "initial_amount": 100,
            "remaining_amount": 12.5,
            "remaining_percent": 12.5,
            "half_lives_elapsed": 3
          }
        }
      },
      "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",
                  "POST",
                  "PUT",
                  "PATCH",
                  "DELETE",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "initial",
                  "half_life",
                  "elapsed",
                  "unit"
                ],
                "properties": {
                  "unit": {
                    "type": "string",
                    "description": "required unit label, 1-24 letters such as seconds, days, or years; use consistently (query)"
                  },
                  "elapsed": {
                    "type": "string",
                    "description": "required finite number greater than or equal to 0 (query)"
                  },
                  "initial": {
                    "type": "string",
                    "description": "required finite number greater than 0 (query)"
                  },
                  "half_life": {
                    "type": "string",
                    "description": "required finite number greater than 0 (query)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "json"
              },
              "example": {
                "type": "object",
                "required": [
                  "initial_amount",
                  "half_life",
                  "elapsed",
                  "unit",
                  "half_lives_elapsed",
                  "remaining_amount",
                  "decayed_amount",
                  "remaining_percent",
                  "scope_note"
                ],
                "properties": {
                  "unit": {
                    "type": "string",
                    "description": "Unit of measure"
                  },
                  "elapsed": {
                    "type": "number"
                  },
                  "formula": {
                    "type": "string",
                    "description": "Formula used for the calculation"
                  },
                  "half_life": {
                    "type": "number",
                    "description": "Half life"
                  },
                  "scope_note": {
                    "type": "string",
                    "description": "What this data covers and what it leaves out"
                  },
                  "mean_lifetime": {
                    "type": "number",
                    "description": "Mean lifetime"
                  },
                  "decayed_amount": {
                    "type": "number",
                    "description": "Decayed amount"
                  },
                  "initial_amount": {
                    "type": "number",
                    "description": "Initial amount"
                  },
                  "remaining_amount": {
                    "type": "number",
                    "description": "Remaining amount"
                  },
                  "remaining_percent": {
                    "type": "number",
                    "description": "Remaining, as a percentage"
                  },
                  "half_lives_elapsed": {
                    "type": "number",
                    "description": "Half lives elapsed"
                  },
                  "remaining_fraction": {
                    "type": "number",
                    "description": "Remaining fraction"
                  },
                  "decay_constant_per_unit": {
                    "type": "number",
                    "description": "Decay constant per unit"
                  }
                }
              }
            }
          }
        }
      }
    },
    "method": "GET",
    "example": {
      "unit": "years",
      "elapsed": 90,
      "half_life": 30,
      "scope_note": "Pure exponential-decay arithmetic only; not safety advice.",
      "decayed_amount": 87.5,
      "initial_amount": 100,
      "remaining_amount": 12.5,
      "remaining_percent": 12.5,
      "half_lives_elapsed": 3
    },
    "license": "calculation",
    "mimeType": "application/json",
    "freshness": "computed per request",
    "tokenCount": null,
    "description": "Calculate ideal first-order exponential decay from an initial amount, half-life, and elapsed time in any consistent unit, returning remaining and decayed amounts, fraction and percentage remaining, elapsed half-lives, decay constant, mean lifetime, formula, and a strict non-safety scope note.",
    "inputSchema": {
      "unit": "required unit label, 1-24 letters such as seconds, days, or years; use consistently (query)",
      "elapsed": "required finite number greater than or equal to 0 (query)",
      "initial": "required finite number greater than 0 (query)",
      "half_life": "required finite number greater than 0 (query)"
    },
    "serviceName": "Saylor Innovations — Radioactive Decay Mathematics",
    "instructions": "STANDARD PATH (works with stock x402 clients): send payload.transaction — a base64 partially-signed Solana transaction — and we route verify/settle through an x402 facilitator that sponsors the fee and submits it. Include the chosen accepts entry as \"accepted\" so we can match terms. ALTERNATIVE PATH (no facilitator): Pick ONE entry from accepts and use the reference and session from THAT entry — each asset has its own. USDC or USDT: send an SPL transfer of the exact amount. Native SOL (asset=So11111111111111111111111111111111111111112, extra.native=true): send that many lamports with a system transfer. Either way include extra.reference as a read-only account (Solana Pay style), then retry with PAYMENT-SIGNATURE: base64({x402Version:2, payload:{session, reference}}). If your client cannot attach a reference, send payload.signature instead (USDC only). SOL amounts are quoted live and expire in 120s; stablecoins do not move. The facilitator path verifies and settles in this request. Only the alternative self-submitted Solana path needs retries while the transfer is indexed (typically 3-4 attempts over 10-20s). On that path, a 402 saying \"payment not found on-chain yet\" means keep retrying.",
    "outputSchema": {
      "type": "object",
      "required": [
        "initial_amount",
        "half_life",
        "elapsed",
        "unit",
        "half_lives_elapsed",
        "remaining_amount",
        "decayed_amount",
        "remaining_fraction",
        "remaining_percent",
        "decay_constant_per_unit",
        "mean_lifetime",
        "formula",
        "scope_note"
      ],
      "properties": {
        "unit": {
          "type": "string"
        },
        "elapsed": {
          "type": "number"
        },
        "formula": {
          "type": "string"
        },
        "half_life": {
          "type": "number"
        },
        "scope_note": {
          "type": "string"
        },
        "mean_lifetime": {
          "type": "number"
        },
        "decayed_amount": {
          "type": "number"
        },
        "initial_amount": {
          "type": "number"
        },
        "remaining_amount": {
          "type": "number"
        },
        "remaining_percent": {
          "type": "number"
        },
        "half_lives_elapsed": {
          "type": "number"
        },
        "remaining_fraction": {
          "type": "number"
        },
        "decay_constant_per_unit": {
          "type": "number"
        }
      }
    },
    "noPathTemplate": true,
    "settlementModes": [
      "facilitator-transaction",
      "self-submitted-reference"
    ],
    "typicalLatencyMs": 10
  },
  "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",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://saylorinnovations.com/api/radiation/decay",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://saylorinnovations.com/api/radiation/decay",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 120
  }
]

Provenance

Seen in the source catalog

2026-10-17 14:33Z

Last indexed by Roundhouse

2026-10-25 14:16Z

Last enriched (probe, favicon, geo)

2026-10-15 15:15Z

x402 version

1

Max timeout

120s

Liveness probe

HTTP 402