Loan amortization schedule API, pay-per-request via x402 on Base (USDC).
What it does
This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 64) via a POST request. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled on the Base network using USDC through the x402 protocol.
The x402 challenge confirms the endpoint is live and accepts payments of up to $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is made in USDC on Base to the specified wallet address, with no API keys or rate limits required. The response MIME type is application/json.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request body documentation, and no example responses available. The specific endpoint path suggests it returns a payment schedule for loan ID 64, but the expected input parameters (loan amount, interest rate, term, etc.) and output format are entirely unknown from the available material. The platform advertises uniform $0.02 pricing across all endpoints, no API keys, no rate limits, and instant access.
Capabilities
Use cases
- —Generating an amortization schedule for a loan to see principal and interest breakdowns per period
- —Integrating loan schedule data into a fintech application or dashboard
- —Agent-driven financial planning that needs per-payment loan breakdowns
Fit
Best for
- —Developers needing quick loan schedule calculations without managing API keys
- —AI agents that can pay per-call via x402 for financial computations
- —Prototyping fintech features with zero-commitment pricing
Not for
- —Production systems requiring documented, stable API contracts with SLAs
- —Use cases needing customizable loan IDs (this endpoint is hardcoded to loan 64)
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/64/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint path is hardcoded to a single loan ID with no explanation of input parameters or output format. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt with no content.
- —No OpenAPI or request/response schema provided; input parameters and output format are unknown.
- —Endpoint path is hardcoded to loan ID 64 — unclear if other loan IDs are supported or how to configure loan parameters.
- —The broader platform lists many API categories (AI, analytics, finance, utilities) all at $0.02, but none have visible documentation, raising questions about actual functionality.
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/loans/64/schedule
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC, 6 decimals)https://lowpaymentfee.com/api/v1/loans/64/schedule
- —Payment is in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/loans/64/schedule
- —Platform advertises $0.02/request, no API keys, no rate limits, instant accesshttps://lowpaymentfee.com