x402-gated loan data endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a specific loan resource (loan ID 21) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
The broader lowpaymentfee.com platform advertises a range of x402-gated APIs spanning data & analytics, 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payments settle on the Base network using USDC.
However, the specific endpoint being listed here (/api/v1/loans/21) is not documented on the site's landing page or in any crawled documentation. There is no schema describing the request body or the response format for this loans endpoint. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without documentation or example responses, the actual data returned by this endpoint is unknown.
Capabilities
Use cases
- —Retrieving loan data for loan ID 21 via a single paid API call
- —Programmatic access to financial loan records without API key management
- —Agent-driven data retrieval with automatic USDC micropayments on Base
Fit
Best for
- —Agents or applications that can settle x402 payments in USDC on Base
- —Use cases requiring keyless, pay-per-request access to loan data
- —Developers exploring x402 protocol integrations
Not for
- —Users who need detailed documentation or response schemas before integrating
- —High-volume batch retrieval where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/21 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02 per call. However, the /api/v1/loans/21 path is not documented anywhere on the site, there is no request/response schema, no example payloads, and all documentation pages are empty stubs. The listing is effectively a stub with only the payment challenge as evidence.
Warnings
- —The /api/v1/loans/21 endpoint is not listed among the site's documented APIs — its purpose and response format are unknown.
- —All documentation pages (docs, pricing, API, README) returned no substantive content beyond 'Connect wallet'.
- —No request body schema or response schema is available for this endpoint.
- —The 'loans' category does not appear anywhere in the site's advertised API catalog.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/loans/21
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/loans/21
- —Documentation pages (docs, pricing, API, README) contain only 'Connect wallet' with no substantive content.https://lowpaymentfee.com/docs