Loan amortization schedule endpoint, 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 54 in the URL path). It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled via the x402 protocol on the Base network using USDC.
The endpoint is live and responds with a 402 Payment Required challenge, indicating it accepts x402 payments. The price is 20,000 base units of USDC (which has 6 decimals), equating to $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The endpoint accepts POST requests and returns application/json responses.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what parameters the POST body should contain or what fields the schedule response includes. The loan schedule functionality is inferred solely from the URL path structure. The platform advertises no API keys, no rate limits, and instant access across all its endpoints.
Capabilities
Use cases
- —Retrieving a detailed amortization schedule for a loan showing principal and interest breakdowns per period
- —Integrating loan schedule data into financial planning or comparison tools
- —Automated agents fetching loan payment details without API key registration
Fit
Best for
- —Developers needing quick, keyless access to loan schedule data
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring on-demand financial calculations without subscription commitments
Not for
- —Users who need comprehensive loan origination or servicing APIs with full documentation
- —Applications requiring bulk or high-volume loan calculations at lower per-unit cost
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/54/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the loan schedule functionality is inferred only from the URL path. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; request body format and response structure are unknown
- —The endpoint path is hardcoded to loan ID 54; it is unclear whether other loan IDs are supported or how loans are created
- —The platform lists many endpoint categories but this specific loan schedule endpoint is not listed on the homepage
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/54/schedule
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/54/schedule