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 24 in the URL path). It is part of a broader platform offering 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 is live and returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is made via the x402 "exact" scheme to the specified wallet address. The response MIME type is application/json, and the endpoint accepts POST requests. No API keys or rate limits are advertised — access is gated purely by micropayment.
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 schema, no request body documentation, and no example responses available. The loan schedule endpoint itself is not listed on the homepage (which showcases other API categories), so its exact input parameters and output format are unknown. The platform's general pricing of $0.02 per request aligns with the 402 challenge amount.
Capabilities
Use cases
- —Retrieving a loan amortization schedule showing principal and interest breakdowns per period
- —Integrating loan payment calculations into financial planning tools
- —Agent-driven loan analysis workflows that pay per query
Fit
Best for
- —Developers needing on-demand loan schedule data without API key management
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring pay-as-you-go financial calculation endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume batch loan calculations where per-request pricing adds up
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/24/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no request/response schema, no examples, and the specific endpoint is not even listed on the provider's homepage. Effectively a stub with confirmed liveness.
Warnings
- —No API documentation available — docs, pricing, and README pages all return only a wallet connect prompt
- —No OpenAPI or request/response schema provided; input parameters for the loan schedule endpoint are unknown
- —This specific endpoint (/api/v1/loans/24/schedule) is not listed among the provider's advertised APIs on the homepage
- —Loan ID 24 is hardcoded in the URL path; it is unclear whether other loan IDs are supported or how to create them
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/24/schedule
- —The platform advertises $0.02 per request pricing 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/24/schedule