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 57) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.
The specific endpoint `/api/v1/loans/57` is labeled "Premium API Access" in the x402 challenge. The challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are required — access is granted purely through per-call USDC payment.
Documentation on the site 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 documentation, and no examples of what the loan data response looks like. The endpoint path suggests it returns data about a specific loan (ID 57), but the exact fields and structure are unknown. The platform appears to be a demonstration or early-stage x402 API marketplace.
Capabilities
Use cases
- —Retrieving loan data for a specific loan record via micropayment
- —Demonstrating x402 payment protocol integration on Base
- —Programmatic access to financial loan information without API key management
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need on-demand loan data without subscription commitments
- —Testing pay-per-request API patterns on Base L2
Not for
- —Production use requiring documented response schemas and SLAs
- —Bulk loan data retrieval where per-request pricing is inefficient
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/57 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific /loans/57 endpoint is unclear beyond its label. This is effectively a stub listing.
Warnings
- —No OpenAPI spec or schema documentation available
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The endpoint path /api/v1/loans/57 is not listed on the site's homepage API catalog — it may be a test or unlisted resource
- —Response format and fields are completely unknown
- —The broader platform appears to be early-stage or a demonstration site
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/loans/57
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/57
- —Documentation pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs