x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a specific loan resource (loan ID 74) via the x402 payment protocol. The site advertises itself as a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities, all priced at $0.02 per call and settled in USDC on the Base network. No API keys, rate limits, or commitments are required — callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/loans/74` is labeled "Premium API Access" in the x402 challenge but does not appear in the site's public API catalog, which lists endpoints under analytics, AI, finance, and utility categories. The challenge confirms the endpoint is live, accepts POST requests, and requires up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what data the loans endpoint actually returns. The endpoint appears functional based on the 402 challenge, but without documentation it is unclear what fields are included in the response or what POST body (if any) is expected.
Capabilities
Use cases
- —Retrieving loan data for loan ID 74 via a single paid API call
- —Integrating pay-per-request financial data into agent workflows
- —Demonstrating x402 payment protocol usage on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing on-demand loan data without API key management
- —Low-volume, pay-as-you-go data access
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk loan data retrieval across many loan IDs
- —Users who need fiat-only payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/74 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the specific /loans/74 endpoint is not listed in the site's own catalog. Effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request body or response format for /api/v1/loans/74
- —This specific endpoint (/api/v1/loans/74) is not listed in the site's public API catalog
- —Unknown what data the loans endpoint actually returns
Citations
- —The site advertises all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/loans/74
- —Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeouthttps://lowpaymentfee.com/api/v1/loans/74