Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.
What it does
This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 87 in the URL path). 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 priced at $0.02 per request with no API keys, no rate limits, and no commitments.
The endpoint accepts POST requests and is gated by the x402 payment protocol. Callers must include an X-PAYMENT header containing a valid payment proof settling $0.02 in USDC on the Base network (asset contract 0x8335…2913). The 402 challenge confirms the endpoint is live, discoverable, and returns application/json. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a maximum timeout of 300 seconds.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific input parameters for the loan schedule endpoint (e.g., whether the loan ID is fixed or parameterizable, what fields the schedule contains) are unknown from the available material. The endpoint path suggests it returns a payment schedule for loan #87, but it is unclear whether other loan IDs are supported or how loans are created.
Capabilities
Use cases
- —Retrieve a loan amortization schedule showing principal and interest breakdowns per period
- —Integrate loan schedule data into financial planning or lending applications
- —Programmatic access to structured loan repayment data without API key management
Fit
Best for
- —Agents or apps needing on-demand loan schedule data with crypto micropayments
- —Developers who want keyless, pay-per-call access to financial calculation APIs
- —Prototyping financial tools without subscription commitments
Not for
- —Users who need comprehensive loan origination or management (this is a read-only schedule endpoint)
- —Applications requiring detailed API documentation or guaranteed SLAs
- —Users without access to USDC on the Base network for payment
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/87/schedule \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific functionality (loan schedule) is only inferred from the URL path. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content
- —It is unclear whether the loan ID (87) is parameterizable or if this is the only available loan
- —No examples of request body or response payload exist in the crawled material
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/loans/87/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/87/schedule
- —maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/loans/87/schedule