Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at `/api/v1/loans/52` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific resource at `/loans/52` is labeled "Premium API Access" and returns JSON data via HTTP POST. Payment is settled on the Base network using USDC (contract `0x8335...2913`) through the x402 exact-payment scheme.
The x402 challenge advertises a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request, consistent with the site-wide pricing of $0.02/request displayed on the landing page. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
Documentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data the `/api/v1/loans/52` endpoint actually returns. The endpoint path suggests loan-related financial data (possibly a specific loan record with ID 52), but this is purely inferred from the URL structure. The broader site lists many endpoint categories but this specific loans path does not appear on the landing page's API directory, making its purpose unclear.
Capabilities
Use cases
- —Fetching loan-related data on a per-request payment basis without API keys
- —Integrating pay-per-call financial data into agent workflows via x402
- —Accessing premium data endpoints using USDC micropayments on Base
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access
- —Users comfortable with x402 protocol and USDC on Base
- —Low-volume or sporadic data consumers who prefer no subscriptions
Not for
- —Users needing detailed API documentation or schemas before integration
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/52 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually returns. No OpenAPI schema, no request/response examples, and the /loans/52 path isn't even listed on the site's own API directory. Effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —The /api/v1/loans/52 endpoint is not listed in the site's own API directory on the landing page
- —No request body schema or response schema is provided; the purpose and output of this endpoint are unknown
- —Cannot verify what data is returned without making a paid request
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/52
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/52