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 (ID 81) 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 per request is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" payment scheme, with a timeout of 300 seconds.
The broader lowpaymentfee.com platform advertises a range of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint (/api/v1/loans/81) is not listed on the homepage's catalog, so it may be a less-documented or specialized resource. The response MIME type is application/json and the endpoint accepts HTTP POST requests.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what the loan resource contains or what POST body it expects. Without further documentation, the exact data returned and the required input format remain unknown.
Capabilities
Use cases
- —Retrieving loan data for a specific loan record (ID 81) via a single micropayment
- —Integrating pay-per-request loan information into automated financial workflows
- —Agent-driven access to loan resources without API keys or subscriptions
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that need on-demand loan data without subscription overhead
- —Projects already using USDC on Base for micropayments
Not for
- —Users needing detailed API documentation or request/response schemas before integration
- —Bulk loan data retrieval across many records (only a single loan ID is exposed here)
- —Non-crypto users who cannot pay with USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/81 \
-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 pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific /loans/81 resource is not even listed on the site's homepage catalog. The purpose and data format of this endpoint are entirely unclear.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /api/v1/loans/81 path is not listed among the site's advertised APIs — its purpose is undocumented
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —Request body format and response structure are completely unknown
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/loans/81
- —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
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/81