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 given loan (identified by ID 50 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 gated behind the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/loans/50/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, and no usage examples available from the crawled material. The loan schedule endpoint is not listed on the homepage's catalog of available APIs, which raises questions about whether it is a fully supported production endpoint or a demo/test route. Without documentation on what request body fields are expected or what the response structure looks like, integration requires experimentation.
Capabilities
Use cases
- —Generating an amortization schedule for a specific loan to display payment breakdowns
- —Integrating loan schedule data into a financial planning tool or dashboard
- —Programmatically retrieving payment schedules for lending platform back-ends
Fit
Best for
- —Developers needing on-demand loan amortization data without API key management
- —Agents that can settle micropayments via x402/USDC on Base
- —Applications requiring simple per-call pricing with no subscription overhead
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Bulk loan portfolio analysis requiring thousands of calls (no documented rate limits but no guarantees either)
- —Non-crypto users who cannot settle payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/50/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific loans endpoint is not listed in the site's own catalog. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.
- —The /api/v1/loans/50/schedule endpoint is not listed on the provider's homepage catalog of available APIs.
- —No request body schema or response schema is documented or discoverable.
- —Unknown whether the loan ID '50' in the path is a fixed demo or a parameterizable resource.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/50/schedule
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/50/schedule