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Api Endpoint

Saylor Innovations Dev Tools

Loan amortization schedule calculator - monthly payment, total interest, payoff time and first 12 payments, with savings from an extra monthly payment

Open interactive test console

Offering

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

Endpoint context

URL
https://saylorinnovations.com/api/calc/amortization
MIME type
Not provided
First seen
2026-10-16T01:51:51.176Z
Last seen
Tags
calc, amortization, calculator

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: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7"
  }
]

Observed health

Status
Healthy
Latest latency
582 ms
Average latency
178 ms
HTTP status
402
Last checked
Reachability
100% over 2 checks

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

Input schema

{
  "additionalProperties": false,
  "properties": {
    "method": {
      "enum": [
        "GET",
        "POST",
        "PUT",
        "PATCH",
        "DELETE",
        "HEAD"
      ],
      "type": "string"
    },
    "queryParams": {
      "properties": {
        "extra_payment": {
          "description": "optional extra monthly payment",
          "type": "string"
        },
        "principal": {
          "description": "Loan amount",
          "type": "string"
        },
        "rate": {
          "description": "Annual interest rate in percent",
          "type": "string"
        },
        "years": {
          "description": "Loan term in years",
          "type": "string"
        }
      },
      "type": "object"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method"
  ],
  "type": "object"
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET",
            "POST",
            "PUT",
            "PATCH",
            "DELETE",
            "HEAD"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "extra_payment": {
              "description": "optional extra monthly payment",
              "type": "string"
            },
            "principal": {
              "description": "Loan amount",
              "type": "string"
            },
            "rate": {
              "description": "Annual interest rate in percent",
              "type": "string"
            },
            "years": {
              "description": "Loan term in years",
              "type": "string"
            }
          },
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "first_12_payments": {
              "items": {
                "properties": {
                  "balance": {
                    "type": "number"
                  },
                  "interest": {
                    "type": "number"
                  },
                  "month": {
                    "type": "number"
                  },
                  "payment": {
                    "type": "number"
                  },
                  "principal": {
                    "type": "number"
                  }
                },
                "type": "object"
              },
              "type": "array"
            },
            "interest_saved_by_extra": {
              "type": "number"
            },
            "monthly_payment": {
              "type": "number"
            },
            "payoff_months": {
              "type": "number"
            },
            "total_interest": {
              "type": "number"
            },
            "total_paid": {
              "type": "number"
            },
            "yearly": {
              "items": {
                "properties": {
                  "balance": {
                    "type": "number"
                  },
                  "interest_paid": {
                    "type": "number"
                  },
                  "principal_paid": {
                    "type": "number"
                  },
                  "year": {
                    "type": "number"
                  }
                },
                "type": "object"
              },
              "type": "array"
            }
          },
          "required": [
            "monthly_payment",
            "total_interest",
            "payoff_months"
          ],
          "type": "object"
        },
        "type": {
          "const": "json",
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}