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 29) 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 via the x402 "exact" scheme to a specified wallet address on Base. The response MIME type is application/json. No API keys or rate limits are advertised — access is gated solely by micropayment.
Documentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint path suggests it returns a payment schedule for loan ID 29, but it is unclear whether the loan ID is variable, what POST body parameters are accepted, or what fields the response contains. The platform's landing page lists many endpoint categories but this specific loans endpoint is not among the advertised APIs, raising questions about whether it is a demo or production resource.
Capabilities
Use cases
- —Retrieving a loan amortization schedule programmatically
- —Integrating loan payment breakdowns into financial dashboards
- —Agent-driven financial planning that needs per-call loan schedule data
Fit
Best for
- —Developers needing on-demand loan schedule data without API key management
- —AI agents that can settle x402 micropayments on Base
- —Prototyping financial tools with low-commitment per-request pricing
Not for
- —High-volume batch loan calculations where per-request fees add up
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring customizable loan parameters (unclear if supported)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/29/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 OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and this specific loans endpoint is not listed among the provider's advertised APIs. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages all return only a 'Connect wallet' prompt
- —No OpenAPI or request/response schema provided; request body parameters are unknown
- —This /api/v1/loans/29/schedule endpoint is not listed among the provider's advertised APIs on the landing page
- —Loan ID 29 is hardcoded in the URL; unclear if other loan IDs are supported or how loans are created
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/loans/29/schedule
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/loans/29/schedule
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Docs, pricing, and API pages return only a 'Connect wallet' prompt with no further documentationhttps://lowpaymentfee.com/docs