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 51 in this case). 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 accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the site's advertised flat $0.02/request pricing across all endpoints. No API keys, subscriptions, or rate limits are required; access is instant upon payment.
The specific endpoint `/api/v1/loans/51/schedule` appears to be a loan-specific resource. The broader platform lists endpoints for analytics, AI inference (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Documentation pages exist but returned minimal content ('Connect wallet') during crawl, so detailed request/response schemas are not available.
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 tools without managing API keys
- —Programmatic access to loan payment calculations for fintech applications
Fit
Best for
- —Agents or apps needing on-demand loan amortization data
- —Developers who want keyless, pay-per-call financial APIs
- —Crypto-native applications that can settle micropayments on Base
Not for
- —Users who need free or subscription-based bulk access to financial data
- —Applications that cannot handle x402 payment flows or USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/51/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages returned only 'Connect wallet' with no useful content. The specific loan endpoint (loan ID 51) is opaque — it's unclear whether this is a demo resource or a real parameterized endpoint. Effectively a stub listing.
Warnings
- —No request or response schema available — input parameters and output format are unknown
- —Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content during crawl
- —The endpoint references a hardcoded loan ID (51); it is unclear if this is parameterizable or a fixed demo resource
- —The platform lists many diverse API categories but all docs are empty, raising questions about maturity
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/51/schedule
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/loans/51/schedule