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 35 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 endpoint 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 beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what fields the POST body should contain or what the schedule response looks like. The endpoint path suggests it returns an amortization schedule for a pre-existing loan resource (ID 35), but it is unclear whether the loan parameters are fixed server-side or supplied in the request body.
Capabilities
Use cases
- —Retrieve a detailed amortization schedule showing principal and interest breakdowns per payment period
- —Integrate loan schedule data into financial planning or lending applications
- —Automate loan analysis workflows with per-call micropayments and no API key management
Fit
Best for
- —Developers needing on-demand loan amortization data without subscription overhead
- —AI agents that need to fetch financial schedules via x402 micropayments
- —Prototyping financial tools where pay-per-use pricing is preferred
Not for
- —Production systems requiring documented request/response schemas and SLAs
- —Users who need to create or configure custom loans (this endpoint targets a fixed loan ID)
- —High-volume batch processing where per-request fees may accumulate
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/35/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific loan endpoint (ID 35) is not listed on the landing page, and it is unclear what input it expects or what output it produces. Effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only a wallet connect prompt
- —No OpenAPI or schema definition for request or response bodies
- —The endpoint targets a hardcoded loan ID (35); it is unclear if this is a demo resource or a real loan
- —The loan schedule endpoint is not listed among the advertised APIs on the landing page
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/35/schedule
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/35/schedule