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 78 in the URL path). It is part of a broader platform offering various 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 Payment Required challenge, indicating it accepts x402 payments with a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule contains or what input parameters the POST body expects. The loan-specific path (/loans/78/schedule) suggests this may be a fixed demo resource or that the loan ID is parameterized. Without documentation, the exact request format and response structure are unknown.
Capabilities
Use cases
- —Retrieve an amortization schedule for a loan showing principal and interest breakdowns per period
- —Integrate loan payment schedule data into financial planning tools
- —Programmatic access to loan repayment details without API key management
Fit
Best for
- —Agents needing on-demand loan schedule data with no signup
- —Developers building financial tools who want pay-per-call pricing
- —Crypto-native applications that can settle payments on Base
Not for
- —Users needing detailed API documentation or guaranteed schema stability
- —Applications requiring bulk loan data retrieval at scale (no documented batch endpoint)
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/78/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the loan-specific path is unexplained. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt
- —No OpenAPI or request/response schema provided; input parameters for the POST body are unknown
- —The endpoint path includes a hardcoded loan ID (78); it is unclear whether this is parameterized or a fixed demo resource
- —No information on what fields the amortization schedule response contains
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/78/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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/78/schedule