Loan amortization schedule API on Base, pay $0.02 per request via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com returns a loan amortization schedule for a given loan (identified by ID in the URL path). It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled on-chain via the x402 protocol using USDC on the Base network.
The specific endpoint `/api/v1/loans/1/schedule` accepts POST requests and returns JSON. Based on the URL structure, it likely computes or retrieves a payment schedule for loan ID 1, though no detailed input/output schema documentation was found in the crawl. The x402 challenge confirms the endpoint is live and requires a payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals.
The platform advertises no API keys, no rate limits, and instant access. All payments are handled via the x402 payment header — callers attach a signed USDC payment to each request. Documentation pages (/docs, /pricing, /api) returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas are unavailable.
Capabilities
Use cases
- —Generating an amortization schedule for a specific loan to display payment breakdowns
- —Integrating loan schedule data into a fintech dashboard or lending application
- —Automated agents computing or verifying loan payment schedules on behalf of users
Fit
Best for
- —Developers needing on-demand loan schedule calculations without subscription commitments
- —AI agents that need programmatic access to financial calculations with crypto-native payments
- —Applications requiring simple pay-per-call finance APIs without API key management
Not for
- —Bulk batch processing of thousands of loan schedules (no documented batch endpoint)
- —Users who need detailed API documentation or SDKs before integrating
- —Applications requiring fiat-only payment rails (this endpoint requires USDC on Base)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/1/schedule \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{"loanId": 1}'Example
Request
{
"loanId": 1
}Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no documented input/output format, and all documentation pages returned only a wallet-connect prompt. The endpoint's exact request body and response structure are unknown, making this effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all returned only 'Connect wallet' with no content.
- —Request and response schemas are entirely inferred from the URL path; no formal specification exists.
- —The endpoint path hardcodes loan ID 1 — it is unclear whether other loan IDs are supported or how loans are created.
- —Example request JSON is speculative; actual required fields are unknown.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/loans/1/schedule
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/1/schedule
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across data/analytics, AI/ML, finance/web3, and infrastructure categorieshttps://lowpaymentfee.com