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 62) 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 payment 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 via an exact-scheme x402 header to the specified payTo address, with a 300-second timeout. The response MIME type is application/json. No API keys or rate limits are advertised — access is gated solely by the per-request micropayment.
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 spec, no request/response schema, and no explanation of what fields the loan schedule contains or what POST body parameters are expected. The endpoint path suggests it returns a payment schedule for a pre-existing loan resource (ID 62), but it is unclear whether the loan ID is fixed or if other loan IDs are available, or whether the POST body allows customization of schedule parameters.
Capabilities
Use cases
- —Retrieve a loan amortization schedule showing principal and interest breakdowns per period
- —Integrate loan payment schedule data into a financial planning application
- —Programmatically access structured loan repayment data without API key management
Fit
Best for
- —Agents or apps needing on-demand loan schedule data with no signup
- —Developers wanting x402-gated financial APIs on Base
- —Quick one-off loan amortization lookups paid per request
Not for
- —Bulk or high-volume loan calculations where per-request fees add up
- —Users needing detailed documentation or guaranteed SLA before integrating
- —Custom loan modeling with arbitrary parameters (unclear if supported)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/62/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 OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of this loan/62/schedule endpoint is only inferrable from the URL path. Effectively a stub listing.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content
- —Unclear what POST body parameters are accepted or what fields the schedule response contains
- —The endpoint is hardcoded to loan ID 62; it is unknown whether other loan IDs exist or if this is a demo resource
- —The broader platform lists many API categories but this specific endpoint is not listed on the homepage
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/loans/62/schedule
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02https://lowpaymentfee.com/api/v1/loans/62/schedule
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs