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 37 in the URL path). It is part of a broader platform offering various 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. Payment settles in USDC on the Base network (asset contract 0x8335…2913). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The response MIME type is application/json.
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 endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response schema for the loan schedule must be inferred or discovered experimentally.
Capabilities
Use cases
- —Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period
- —Integrate loan schedule data into a financial planning or lending application
- —Automate loan payment calculations without maintaining local amortization logic
Fit
Best for
- —Agents or apps needing on-demand loan amortization data via a simple HTTP call
- —Developers who want keyless, pay-per-use financial APIs settled in crypto
- —Prototyping financial tools without signing up for traditional API providers
Not for
- —Users who need bulk or batch loan calculations at high volume (no documented batch endpoint)
- —Anyone requiring detailed API documentation or guaranteed SLAs before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/37/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages render only a wallet-connect prompt. The specific loan ID (37) hardcoded in the path is unexplained. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.
- —No OpenAPI or schema definition found; request body format and response structure are unknown.
- —The endpoint path includes a hardcoded loan ID (37); it is unclear whether other loan IDs are supported or how to create/query loans.
- —The platform lists many diverse API categories (AI, analytics, finance, infrastructure) all at $0.02 — the breadth and uniform pricing may indicate placeholder or demo endpoints.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network at maxAmountRequired 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/loans/37/schedule
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/loans/37/schedule