Loan amortization schedule API on Base, pay $0.02 per request via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 23 in the probed URL). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and utility categories, all settled on the Base network using USDC via the x402 protocol.
The x402 challenge confirms the endpoint is live and accepts POST requests. The price is 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The endpoint returns application/json.
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 spec, no request/response schema documentation, and no example payloads available. The specific loan schedule endpoint (/api/v1/loans/23/schedule) is not listed on the homepage's API catalog, so its exact input parameters and response format are unknown. The listing description "Premium API Access" is generic and does not describe the endpoint's actual functionality. Users should expect to experiment with POST body parameters to discover the correct request format.
Capabilities
Use cases
- —Retrieving a detailed amortization schedule for a loan showing principal and interest breakdown per period
- —Integrating loan schedule data into financial planning or lending applications
- —Agents autonomously fetching loan repayment details without pre-registration or API keys
Fit
Best for
- —Developers needing on-demand loan amortization data without subscription commitments
- —AI agents that can settle micropayments on Base for financial data
- —Applications requiring per-request pricing with no rate limits
Not for
- —Users who need comprehensive financial API documentation before integrating
- —Bulk or high-volume loan data retrieval where per-request pricing becomes expensive
- —Users without a Base-compatible wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/23/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint path is not listed in the site's own catalog. Effectively a stub listing with confirmed liveness.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —The /api/v1/loans/23/schedule endpoint is not listed on the provider's homepage API catalog
- —All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no content
- —The loan ID '23' is hardcoded in the URL; it is unclear whether other loan IDs are supported or how loans are created
Citations
- —The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/23/schedule
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/loans/23/schedule
- —Platform advertises $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —Documentation pages return only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs