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 94 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 via the x402 protocol using USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the platform's uniform $0.02-per-request pricing. No API keys, rate limits, or upfront commitments are required; access is instant once payment is attached.
The specific loan schedule endpoint sits under `/api/v1/loans/{id}/schedule`, suggesting a parameterized route for different loan IDs. However, no detailed documentation on request body schema, supported parameters (e.g., loan amount, interest rate, term), or response structure was found in the crawl. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content. The platform lists many other endpoints (analytics, AI, finance, infrastructure) at the same price point, but none had detailed documentation available.
Capabilities
Use cases
- —Generate an amortization schedule for a given loan to see payment breakdowns over time
- —Integrate loan schedule calculations into fintech applications without managing API keys
- —Programmatically retrieve payment schedules for lending platforms or dashboards
Fit
Best for
- —Developers building lending or mortgage tools who need on-demand amortization schedules
- —AI agents that need to compute or retrieve loan payment breakdowns autonomously
- —Applications requiring pay-per-use financial calculations without subscription overhead
Not for
- —Users needing detailed API documentation or schema validation before integration
- —High-volume batch processing where per-request pricing may add up quickly
- —Non-crypto users who cannot settle payments via USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/94/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 USDC on Base). However, there is no documentation on request/response schemas, no OpenAPI spec, and the docs/pricing/API pages are empty stubs. The specific purpose of this loan schedule endpoint is inferred from the URL path alone.
Warnings
- —No request or response schema documentation available — input parameters and output format are unknown
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content
- —The loan ID '94' is hardcoded in the probed URL; it is unclear whether arbitrary loan IDs are supported or how loans are created
- —Platform appears to list many diverse endpoints but none have detailed documentation
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/94/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/94/schedule