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 93 in the URL path). It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/loans/93/schedule` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
While the endpoint is live and returns a valid 402 challenge, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule contains or what input parameters the POST body expects. The loan-specific path (`/loans/93/schedule`) suggests this may be a demo or fixed-resource endpoint rather than a general-purpose loan calculator. Without documentation, the exact request format and response structure remain unknown.
Capabilities
Use cases
- —Retrieving an amortization schedule for a specific loan
- —Integrating loan payment breakdowns into financial dashboards
- —Agent-driven loan analysis workflows that pay per call
Fit
Best for
- —Developers needing simple pay-per-call loan schedule data
- —AI agents with x402/USDC payment capability on Base
- —Prototyping financial tools without API key signup
Not for
- —Production loan origination systems requiring documented, stable APIs
- —Users needing configurable loan parameters (no docs on input schema)
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/93/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request parameters or response schema. The docs/pricing/README pages are all empty beyond a wallet connect prompt. The loan-specific path (/loans/93) suggests a fixed resource rather than a general API, and no examples exist.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —Endpoint path references a specific loan ID (93); unclear if this is a demo or if other loan IDs are supported
- —No information on what POST body fields are expected
Citations
- —Uniform $0.02/request pricing, no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/93/schedule
- —USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/93/schedule