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 26) via a POST request. 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 charges $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled inline via the X-PAYMENT header; no API keys, accounts, or rate limits are required. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule returns or what input parameters the POST body expects. The endpoint path suggests it serves a pre-existing loan record (ID 26), but it is unclear whether the body accepts parameters like loan amount, term, or interest rate, or whether it simply returns a fixed schedule. Use with caution until better documentation is available.
Capabilities
Use cases
- —Retrieving an amortization schedule for a loan to understand payment breakdowns
- —Integrating loan schedule data into a financial planning application
- —Agents autonomously fetching loan payment details without pre-registration
Fit
Best for
- —Developers needing quick, keyless access to loan schedule data
- —AI agents that can settle micropayments on Base via x402
- —Applications requiring on-demand financial calculations without subscription overhead
Not for
- —Users who need comprehensive loan origination or underwriting services
- —Applications requiring bulk or batch loan schedule generation at scale (no documented batch endpoint)
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/26/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), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific loan ID 26 path is ambiguous. Effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; input parameters and output format are unknown.
- —The endpoint path is hardcoded to loan ID 26; it is unclear if other loan IDs are supported or if parameters can be customized.
- —The platform lists many diverse API categories (AI, analytics, finance, utils) all at $0.02 — the actual depth and quality of each endpoint is unverifiable.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/loans/26/schedule
- —Price is $0.02 per request (20,000 base units USDC, 6 decimals)https://lowpaymentfee.com
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/26/schedule