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 88 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 returns a 402 Payment Required challenge, indicating it accepts x402 payments with a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). The payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts POST requests and returns application/json responses.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content. The specific loan schedule endpoint is not listed on the homepage's API catalog, and no request/response schema is documented. The endpoint path suggests it returns an amortization schedule for a pre-existing loan resource (ID 88), but the input parameters and response structure are unknown. The platform advertises no API keys, no rate limits, and instant access at a flat $0.02 per request across all endpoints.
Capabilities
Use cases
- —Retrieving an amortization schedule for a loan to see payment breakdowns over time
- —Integrating loan schedule data into a financial planning application
- —Agents needing on-demand loan payment calculations without API key management
Fit
Best for
- —Developers needing quick, keyless access to loan schedule data
- —AI agents that can settle micropayments on Base via x402
- —Applications requiring per-call billing with no subscription commitment
Not for
- —Users who need to create or configure custom loans (endpoint is for a fixed loan ID)
- —Applications requiring detailed API documentation or guaranteed SLAs
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/88/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"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 for this specific endpoint, no request/response schema, and the loan ID is hardcoded in the path. The docs pages returned no useful content. This is effectively a stub listing.
Warnings
- —No request or response schema documented for this endpoint
- —The endpoint path contains a hardcoded loan ID (88); unclear if other loan IDs are supported or how loans are created
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content
- —This specific endpoint is not listed in the homepage API catalog
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/88/schedule
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/88/schedule