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FastX402 Loan Payment Calculator
x402
FastX402 Loan Payment Calculator is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-27).
Calculates monthly mortgage/loan payment, total interest, and total amount paid given principal, annual rate, and term in months
Price / call$0.002
Success—
StatusUnknown
How this service works
200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object with: monthly_payment (fixed monthly installment), total_paid (sum of all payments over the loan term), total_interest (total interest cost above principal), plus echoes of the input values: principal, annual_rate_percent, and months.
Example use cases
First-time homebuyer mortgage estimate
“I'm looking at a $380,000 home and I can put 20% down, so I need a $304,000 mortgage. If the interest rate is 6.75% and I go with a 30-year loan (360 months), what will my monthly payment be and how much total interest will I pay over the life of the loan?”
Compare 15-year vs 30-year loan cost
“Can you calculate the monthly payment and total interest for a $200,000 loan at 5.5% over 180 months so I can compare it against a 30-year option?”
Auto loan monthly payment check
“I'm financing a $35,000 car at 7.2% annual interest over 60 months — what will my monthly payment be and how much total will I have paid by the end?”
Technical details
Endpoint
GEThttps://fastx402.tools/loan-payment?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, accurate fixed-rate loan amortization calculation — monthly payment, total interest, and total paid — without setting up an account or API key. Ideal for AI agents that need on-demand financial computation for mortgage, auto, or personal loan scenarios, paying only $0.002 per call in USDC via x402 on Base or Solana.
Side effects
- Missing required query parameters (principal, annual_rate_percent, months) returns an error
- Non-numeric or negative values for principal/rate/months may return an error or nonsensical result
- Annual rate of 0% may cause division edge cases
- Extremely large principals or very short terms may return unexpected values
- Payment via x402 fails if wallet has insufficient USDC balance
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"months": 360,
"principal": 250000,
"total_paid": 456015.6,
"total_interest": 206015.6,
"monthly_payment": 1266.71,
"annual_rate_percent": 4.5
}
}Tags
x402
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