x402-gated loan data endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a loan resource (ID 10) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The specific resource path `/api/v1/loans/10` suggests it returns data about a particular loan, though the exact response schema is not documented.
The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Most listed endpoints are priced at $0.02 per request. However, the probed loan endpoint advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's uniform pricing. Payment is made via the x402 "exact" scheme to a specified wallet address on Base, with a 300-second timeout.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no description of what the `/api/v1/loans/10` endpoint actually returns. The loan endpoint itself is not listed on the homepage's catalog of available APIs, making it unclear whether it is a production resource or a test/demo endpoint.
Capabilities
Use cases
- —Retrieving loan data on-demand with per-request USDC micropayments
- —Integrating loan information into agent workflows without API key management
- —Programmatic access to financial loan records via x402 protocol
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call access to loan data
- —Web3-native applications on Base network
Not for
- —Production use cases requiring documented response schemas and SLAs
- —Bulk loan data retrieval at scale (per-request payment model)
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/10 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no response schema, and the loan endpoint is not even listed in the provider's own catalog. Effectively a stub with unknown output.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or response schema provided; unknown what data the endpoint returns
- —The /api/v1/loans/10 path is not listed in the provider's homepage catalog of available APIs
- —Loan-specific endpoints may involve regulated financial data — verify compliance requirements
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/10
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/10
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs