Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.
What it does
This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 44 in the probed URL). It is part of a broader platform offering dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network using USDC.
The x402 challenge confirms the endpoint is live and accepts POST requests. The price per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is settled on-chain to a specified address, with no API keys, rate limits, or upfront commitments required. The response MIME type is 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, and no example payloads available. The endpoint path suggests it returns a payment schedule for a loan resource, but the exact request body format and response structure are unknown. The loan ID (44) is hardcoded in the probed URL, so it is unclear whether other loan IDs are available or how loans are created.
Capabilities
Use cases
- —Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period
- —Integrate loan schedule data into financial planning or comparison tools
- —Automate loan analysis workflows with per-call payment and no API key management
Fit
Best for
- —Developers needing on-demand loan schedule calculations without subscription overhead
- —Agent-based financial workflows that can pay per request via x402/USDC
- —Prototyping or low-volume loan analysis where $0.02/call is cost-effective
Not for
- —High-volume production use cases where per-call crypto payments add latency or cost
- —Users who need comprehensive loan origination or management (this appears to be read-only schedule data)
- —Anyone requiring detailed API documentation or guaranteed SLAs before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/44/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/call in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific loan schedule functionality is only inferred from the URL path. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content
- —No OpenAPI or JSON schema for request or response bodies; input format is unknown
- —The loan ID 44 is hardcoded in the probed URL; it is unclear how to access other loans or whether loan creation is supported
- —The endpoint's actual behavior and response format are entirely unverified
Citations
- —The endpoint returns HTTP 402 with an x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/loans/44/schedule
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/loans/44/schedule