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 56 in the URL path). It is part of a broader platform offering dozens of pay-per-call APIs 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 endpoint 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, and no usage examples available. The specific input parameters for the loan schedule endpoint (e.g., loan amount, term, interest rate) are unknown from the available material. The endpoint is live and responding with a proper 402 challenge.
Capabilities
Use cases
- —Generating an amortization schedule for a loan to see payment breakdowns over time
- —Integrating loan schedule calculations into fintech applications without managing API keys
- —Agent-driven financial planning that needs per-call loan computations
Fit
Best for
- —Developers needing on-demand loan amortization calculations
- —AI agents that can settle USDC payments on Base via x402
- —Applications requiring pay-as-you-go financial computation without subscriptions
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume batch loan calculations where per-request pricing may add up
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/56/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 ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The loan ID is hardcoded in the URL path (56), and it's unclear what POST body parameters are expected or what the response structure looks like. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only a wallet connect prompt
- —No OpenAPI or request/response schema provided; input parameters for the loan schedule endpoint are unknown
- —The URL contains a hardcoded loan ID (56); it is unclear whether this is parameterizable or a fixed resource
- —The platform lists many endpoint categories (AI, analytics, finance, etc.) but none have visible documentation
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/56/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/56/schedule