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Api Endpoint

Saylor Innovations Rule of 72 D

Rule of 72 doubling-time calculator - approximate and exact years to double

Open interactive test console

Offering

Provider
saylorinnovations.com
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
General Utilities
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://saylorinnovations.com/api/finance/rule72
MIME type
application/json
First seen
2026-10-16T01:51:51.176Z
Last seen
Tags
Finance, rule72, rule-of-72, doubling-time, calculator, xirr, cagr, cashflow

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.01 USDC
Atomic price: 10000 · Network: eip155:137 · Asset: USDC · Scheme: exact
Payment option 3
0.01 USDC
Atomic price: 10000 · Network: eip155:42161 · Asset: USDC · Scheme: exact
Payment option 4
0.01 USDC
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Payment option 5
10000 atomic units
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
    "amount": "10000",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7"
  }
]

Observed health

Status
Healthy
Latest latency
123 ms
Average latency
246 ms
HTTP status
402
Last checked
Reachability
100% over 4 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET",
        "POST",
        "PUT",
        "PATCH",
        "DELETE",
        "HEAD"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "rate_percent": {
          "type": "string",
          "description": "required positive annual compound growth rate percentage (query)"
        }
      },
      "required": [
        "rate_percent"
      ]
    }
  },
  "required": [
    "type",
    "method",
    "queryParams"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "json"
    },
    "description": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "additionalProperties": true,
      "description": "Output fields observed in live endpoint responses; optionality and values can vary by record.",
      "properties": {
        "rate_percent": {
          "type": "number",
          "description": "Rate, as a percentage"
        },
        "rule_of_72_years": {
          "type": "number",
          "description": "Rule of 72 years"
        },
        "exact_doubling_years": {
          "type": "number",
          "description": "Exact doubling years"
        },
        "absolute_error_years": {
          "type": "number",
          "description": "Absolute error years"
        },
        "annual_growth_factor": {
          "type": "number",
          "description": "Annual growth factor"
        },
        "formula": {
          "type": "string",
          "description": "Formula used for the calculation"
        },
        "rounding": {
          "type": "string",
          "description": "Rounding rule applied to the figures"
        },
        "approximation_note": {
          "type": "string",
          "description": "Approximation note"
        },
        "scope_note": {
          "type": "string",
          "description": "What this data covers and what it leaves out"
        },
        "service_note": {
          "type": "string",
          "description": "Note about the service behind the data"
        },
        "assumption_note": {
          "type": "string",
          "description": "Assumption note"
        }
      },
      "required": [
        "rate_percent",
        "rule_of_72_years",
        "exact_doubling_years",
        "scope_note"
      ]
    }
  },
  "required": [
    "type"
  ]
}