# Saylor Innovations Credit Card Payoff Calculator

> Saylor Innovations Credit Card Payoff Calculator is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Calculates months to pay off a credit card given balance, APR, and a fixed monthly payment, returning total interest, total paid, and interest share percentage

## Facts

- Endpoint: GET https://saylorinnovations.com/api/finance/credit-card-payoff?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-credit-card-payoff-calculator-9bdffcff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fcmJleP_g_hNId3ii8n11

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-credit-card-payoff-calculator-9bdffcff
```

Example prompt: How long will it take me to pay off a $4,500 credit card balance at 22.99% APR if I pay $150 a month, and how much interest will I end up paying in total?

## When to prefer this

Choose this endpoint when you need a fast, lightweight amortization calculation specifically for credit card debt with a fixed monthly payment — it returns not just payoff timeline but also interest share percentage and a minimum payment estimate, making it ideal for debt counseling, budgeting agents, or financial planning workflows without requiring a full loan amortization library

## Known failure modes

- Missing required query parameters (balance, apr, monthly_payment) returns an error
- Monthly payment too low to cover accruing interest may return an error or infinite payoff projection
- Non-numeric strings passed for numeric fields cause validation errors
- APR of 0 or negative values may produce unexpected results

## How this service works

Credit card payoff time from balance, APR and a fixed payment - months, total interest, total paid and what share of payments goes to interest

## Output

Returns a JSON object with months_to_payoff, years_to_payoff, total_interest, total_paid, interest_share_percent, monthly_payment, balance, apr_percent, typical_minimum_payment_first_month, and an optional practical tip about holding the payment constant

## Request schema (JSON Schema)

```json
{
 "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",
     "required": [
      "balance",
      "apr",
      "monthly_payment"
     ],
     "properties": {
      "apr": {
       "type": "string",
       "description": "Annual rate in percent"
      },
      "balance": {
       "type": "string",
       "description": "Current balance"
      },
      "monthly_payment": {
       "type": "string",
       "description": "Fixed monthly payment"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "months_to_payoff",
      "total_interest"
     ],
     "properties": {
      "tip": {
       "type": [
        "string",
        "null"
       ],
       "description": "Practical note on holding the payment constant"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "balance": {
       "type": "number",
       "description": "Balance in whole units"
      },
      "total_paid": {
       "type": "number",
       "description": "Total paid"
      },
      "apr_percent": {
       "type": "number",
       "description": "Apr, as a percentage"
      },
      "total_interest": {
       "type": "number",
       "description": "Total interest"
      },
      "monthly_payment": {
       "type": "number",
       "description": "Monthly payment amount"
      },
      "years_to_payoff": {
       "type": [
        "number",
        "null"
       ],
       "description": "Years to payoff"
      },
      "months_to_payoff": {
       "type": "number",
       "description": "Months to payoff"
      },
      "interest_share_percent": {
       "type": "number",
       "description": "Interest share, as a percentage"
      },
      "typical_minimum_payment_first_month": {
       "type": [
        "number",
        "null"
       ],
       "description": "Typical minimum payment first month"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-credit-card-payoff-calculator-9bdffcff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)