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 16) via the x402 payment protocol. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories, all gated behind x402 micropayments settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the payment parameters (asset, amount, recipient address), construct an on-chain USDC payment on Base, and include the payment proof in the X-PAYMENT header. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The specific functionality of the /api/v1/loans/16 endpoint is not well-documented. The existing title and description simply say "Premium API Access" without detailing what loan data is returned or what input parameters the POST body expects. The broader site lists many endpoint categories (analytics, AI, finance, infrastructure, etc.) but this particular loans endpoint does not appear in the site's main API listing, suggesting it may be a less prominent or specialized resource. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.
Capabilities
Use cases
- —Retrieving loan data for a specific loan record via micropayment
- —Integrating pay-per-request loan information into agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Agents needing on-demand loan data without API key registration
- —Developers experimenting with x402 micropayment protocol
- —Low-volume, pay-as-you-go data access
Not for
- —High-volume bulk loan data retrieval (no documented batch support)
- —Users who need detailed documentation or OpenAPI specs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/16 \
-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 no documentation on what the /loans/16 endpoint actually returns, no OpenAPI schema, no example requests or responses, and the endpoint doesn't appear in the site's own API listing. The crawled docs/pricing/README pages returned only 'Connect wallet' with no useful content.
Warnings
- —The /api/v1/loans/16 endpoint is not listed among the site's advertised APIs, raising questions about its purpose and support status.
- —No documentation, OpenAPI schema, or example request/response bodies are available for this endpoint.
- —The docs, pricing, README, and API pages all returned minimal content ('Connect wallet'), suggesting documentation is incomplete or requires authentication to view.
- —The specific data returned by this loan endpoint is unknown — the description 'Premium API Access' is generic.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/16
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/16
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com