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 40 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 responds with a 402 Payment Required challenge, accepting x402 payments of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is made via the "exact" scheme to a specified wallet address on Base. The response MIME type is application/json, and the endpoint accepts POST requests.
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 schema, no request/response examples, and no description of what parameters the POST body should contain or what the schedule response looks like. The loan schedule endpoint is not listed on the homepage's API catalog, which focuses on analytics, AI, finance, and utility endpoints. This makes it unclear whether loan ID 40 is a fixed demo resource or part of a dynamic loans collection. Users should expect to experiment or contact the provider for integration details.
Capabilities
Use cases
- —Retrieve a loan amortization schedule showing payment breakdowns over time
- —Integrate loan schedule data into financial planning tools
- —Automate loan analysis workflows with per-call micropayments
Fit
Best for
- —Agents or apps needing on-demand loan amortization data without API key management
- —Developers prototyping financial tools who want instant, keyless API access
- —Crypto-native applications that can settle payments on Base
Not for
- —Production use requiring documented request/response schemas and SLAs
- —Bulk or high-volume loan data retrieval where per-request pricing is inefficient
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/40/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 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific loan schedule endpoint isn't even listed on the provider's homepage. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.
- —No OpenAPI or request/response schema provided; request body format and response structure are unknown.
- —This specific endpoint (/api/v1/loans/40/schedule) is not listed among the provider's advertised APIs on the homepage, raising questions about its intended availability.
- —Loan ID 40 appears hardcoded in the URL; it is unclear if other loan IDs exist or how loans are created.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/40/schedule
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/40/schedule
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no further contenthttps://lowpaymentfee.com/docs