Pay-per-call loan data API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request APIs accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/loans/100`) is listed under "Premium API Access" and appears to serve loan-related data (the path suggests a loan resource with ID 100). Payment is settled in USDC on Base at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The broader lowpaymentfee.com platform offers endpoints across several categories: data & analytics (metrics, reports, exports, insights), AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/loans/100` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know what data to send or expect back.
Capabilities
Use cases
- —Fetching loan data or financial calculations on a per-request basis without signup
- —Integrating loan information into agent workflows that can settle payments via x402
- —Accessing financial data programmatically with USDC micropayments on Base
Fit
Best for
- —Agents or developers who want instant, keyless access to loan data
- —Workflows requiring pay-as-you-go financial data without subscriptions
- —x402-compatible clients on the Base network
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Anyone not set up to make x402 USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of /api/v1/loans/100 is unclear. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request parameters or response format
- —The purpose of /api/v1/loans/100 is inferred from the URL path only; no authoritative description exists
- —Cannot verify what data this endpoint actually returns without making a paid request
Citations
- —The endpoint returns a valid x402 402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/loans/100
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/loans/100