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 9) via a POST request. 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 on-chain using the x402 protocol on the Base network with USDC.
The specific endpoint `/api/v1/loans/9/schedule` costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled inline via the X-PAYMENT header; no API keys, accounts, or rate limits are required. The platform advertises uniform $0.02 pricing across all its endpoints.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality and response format must be inferred from the endpoint path alone. The loan ID (9) is hardcoded in the URL, suggesting this may be a demo or a resource-specific route.
Capabilities
Use cases
- —Retrieve a loan amortization schedule showing principal and interest breakdowns per period
- —Integrate loan payment calculations into financial planning tools
- —Automate loan schedule generation for fintech applications
Fit
Best for
- —Agents needing on-demand loan amortization data without API key signup
- —Developers building financial tools who want pay-per-call pricing
- —Crypto-native applications that can settle payments on Base with USDC
Not for
- —Users needing detailed API documentation or guaranteed SLA before integrating
- —Bulk loan schedule generation where per-request costs would accumulate significantly
- —Applications requiring customizable loan parameters if this endpoint is fixed to loan ID 9
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/9/schedule \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming it exists and accepts payment. However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint path with a hardcoded loan ID raises questions about its general utility. All non-landing crawled pages returned only 'Connect wallet' with no content.
Warnings
- —No API documentation available — docs, pricing, README, and API pages all return only a 'Connect wallet' prompt
- —No request or response schema provided; input parameters and output format are unknown
- —Loan ID 9 is hardcoded in the URL — unclear if other loan IDs are supported or how to create them
- —The platform lists many endpoint categories (AI, analytics, finance, etc.) but none appear to include a loans endpoint, suggesting this may be a demo or orphaned route
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/9/schedule
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/loans/9/schedule