Loan amortization schedule endpoint, pay-per-request via x402 on Base (USDC).
What it does
This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 55 in the URL path). It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via USDC on the Base network using the x402 payment protocol.
The specific endpoint `/api/v1/loans/55/schedule` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… 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, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body fields are expected or what the response schema looks like. The loan ID (55) is hardcoded in the URL, and it is unknown whether other loan IDs are supported or how loans are created.
Capabilities
Use cases
- —Retrieving a loan amortization schedule showing principal and interest breakdowns per period
- —Integrating loan schedule data into financial planning tools or dashboards
- —Agent-driven financial calculations where per-call payment is preferred over subscriptions
Fit
Best for
- —Developers needing on-demand loan schedule calculations without API key management
- —AI agents that can settle payments via x402/USDC on Base
- —Applications requiring simple pay-per-use financial data endpoints
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —Bulk loan processing where per-request pricing at $0.02 would be cost-prohibitive at scale
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/55/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"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 loan endpoint path with a hardcoded ID (55) is unexplained. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all return only a wallet connect prompt
- —No OpenAPI or request/response schema provided; request body format is unknown
- —Loan ID 55 is hardcoded in the URL path; it is unclear how to create loans or access other IDs
- —The endpoint description 'Premium API Access' is generic and does not describe the actual functionality
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/55/schedule
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/55/schedule