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 60 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 settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/loans/60/schedule` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the docs, pricing, and API 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 endpoint is live (returns a proper 402 challenge), but without documentation it is difficult to know the expected input format or output structure beyond the MIME type (application/json).
Capabilities
Use cases
- —Generating an amortization schedule for a loan to see payment breakdowns over time
- —Integrating loan schedule data into a financial planning application
- —Agents autonomously fetching loan repayment details for advisory workflows
Fit
Best for
- —Developers needing on-demand loan amortization data via a simple API call
- —AI agents that can settle micropayments on Base to access financial calculations
- —Applications requiring no-signup, keyless access to loan schedule computations
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Production systems requiring guaranteed SLAs or support contracts
- —Bulk batch processing of thousands of loans (no documented batch endpoint)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/60/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of the endpoint can only be inferred from the URL path. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; input parameters for the POST body are unknown
- —The endpoint is hardcoded to loan ID 60 — it is unclear whether other loan IDs are supported or how loans are created
- —No examples of successful responses exist in the crawled material
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/60/schedule
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/60/schedule