x402-payable loan data endpoint on Base, $0.02 per request via USDC
What it does
This endpoint at lowpaymentfee.com provides access to a loan resource (ID 9) via the x402 payment protocol. It accepts POST requests and returns JSON data upon payment of 20,000 base units of USDC on the Base network, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider lowpaymentfee.com hosts a broad catalog of x402-payable endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per call. This specific endpoint (/api/v1/loans/9) is listed under "Premium API Access" but its exact response schema and the nature of the loan data it returns are not documented in the available crawl material. The docs, pricing, and README pages all render only a wallet-connect prompt with no additional technical documentation.
The endpoint is confirmed live: it returns a proper HTTP 402 challenge with x402 version 1, advertising payment to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The maximum timeout for payment settlement is 300 seconds. However, without documentation on the response payload or input parameters, callers should treat this as an exploratory integration.
Capabilities
Use cases
- —Retrieving loan record data without traditional API key registration
- —Programmatic access to loan information via autonomous agents with USDC wallets
- —Integrating pay-per-request loan data into DeFi or fintech workflows
Fit
Best for
- —Agents or bots with Base USDC wallets needing on-demand loan data
- —Developers exploring x402 protocol integrations
- —Low-volume, keyless API consumption at $0.02 per call
Not for
- —High-volume bulk loan data retrieval where per-call costs add up
- —Users who need detailed API documentation and response schema guarantees before integrating
- —Non-crypto users without a Base network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/9 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation on request parameters, response schema, or what 'loans/9' actually returns. Docs pages are empty wallet-connect stubs. The listing is essentially a stub with pricing and liveness confirmed but no functional detail.
Warnings
- —No documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no technical content
- —Response schema for /api/v1/loans/9 is completely unknown; the 'Premium API Access' label is generic
- —No OpenAPI spec or AI plugin manifest found
- —The specific nature of the 'loan' data returned is undocumented — could be placeholder or demo content
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge advertising USDC on Basehttps://lowpaymentfee.com/api/v1/loans/9
- —maxAmountRequired is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/loans/9
- —All endpoints on the site are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300 second timeouthttps://lowpaymentfee.com/api/v1/loans/9