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 52 in the URL path). It is part of a broader platform offering 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 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is made via the x402 "exact" scheme to a specified wallet address. The response MIME type is application/json. The endpoint accepts POST requests and is marked as discoverable.
Documentation beyond the landing page is extremely sparse — 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 loan schedule response contains or what POST body (if any) is expected. The loan ID 52 is hardcoded in the URL, and it is unclear whether other loan IDs are available or how loans are created. The platform advertises uniform $0.02/request pricing, no API keys, no rate limits, and instant access.
Capabilities
Use cases
- —Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period
- —Integrate loan schedule data into financial planning or lending applications
- —Automate loan payment calculations without managing API keys or subscriptions
Fit
Best for
- —Developers needing quick, keyless access to loan schedule data
- —Agents that can settle micropayments via x402 on Base
- —Prototyping financial tools without subscription commitments
Not for
- —Production lending platforms needing configurable loan parameters (no documented input schema)
- —Users who cannot pay with USDC on the Base network
- —Applications requiring bulk or batch loan schedule generation
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/52/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The loan ID is hardcoded and it's unclear what the endpoint actually returns or accepts. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request body and response structure are completely unknown
- —All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no content
- —The loan ID (52) is hardcoded in the endpoint URL; it is unclear if other loan IDs exist or how loans are created
- —The specific endpoint /api/v1/loans/52/schedule is not listed on the provider's landing page among their advertised APIs
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/52/schedule
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/52/schedule
- —Documentation pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs