Loan amortization schedule API, pay-per-request via x402 on Base with USDC.
What it does
This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 69 in the URL path). 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 via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. The x402 challenge indicates 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 advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is handled inline via the X-PAYMENT header per the x402 protocol.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render 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 expects or returns. The endpoint path suggests it serves a pre-configured loan (ID 69), but it is unclear whether the POST body allows customization of loan parameters or if other loan IDs are available. Treat this as a minimally documented endpoint.
Capabilities
Use cases
- —Retrieve a loan amortization schedule showing payment breakdowns over time
- —Integrate loan schedule data into financial planning tools or dashboards
- —Programmatic access to loan payment calculations without API key management
Fit
Best for
- —Agents or apps needing on-demand loan schedule data with crypto micropayments
- —Developers who want keyless, pay-per-call financial APIs on Base
- —Quick prototyping of financial tools without subscription commitments
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Production systems requiring guaranteed SLAs or support contracts
- —Bulk loan portfolio analysis (no evidence of batch or multi-loan endpoints)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/69/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 schema, no request/response examples, and all documentation pages are empty stubs. The specific purpose of this loan schedule endpoint is only inferable from the URL path. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.
- —No OpenAPI or input/output schema provided; request body format and response structure are unknown.
- —The endpoint path is hardcoded to loan ID 69; it is unclear if other loan IDs exist or if parameters can be customized.
- —The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but no evidence of detailed docs for any of them.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/69/schedule
- —Platform advertises $0.02/request uniform 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/69/schedule
- —Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs