Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides access to a loan data resource (loan ID 40) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 20,000 base units, 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 pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. This specific endpoint (/api/v1/loans/40) falls under a "Premium API Access" label but the exact data schema of the loan resource is not documented. The crawled docs, pricing, and README pages all returned only a "Connect wallet" stub, so there is no detailed documentation available for the request body format or the response payload structure.
The endpoint is confirmed live: the probe received a proper HTTP 402 challenge with x402 version 1 headers. The payment is routed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base mainnet. The timeout for payment settlement is 300 seconds. Without further documentation, callers should experiment with POST body contents or contact the provider for schema details.
Capabilities
Use cases
- —Retrieving loan data records on a per-call payment basis without subscription
- —Integrating loan information into agent workflows that can settle USDC on Base
- —Programmatic access to financial loan data with no API key management
Fit
Best for
- —Agents or bots that can settle x402 payments in USDC on Base
- —Developers wanting zero-commitment, pay-as-you-go loan data access
- —Workflows requiring no API key provisioning or rate limit negotiation
Not for
- —Users who need detailed API documentation or response schema guarantees before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone unable to transact USDC on the Base L2 network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/40 \
-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 for request/response schemas. The docs, pricing, and README pages are all empty stubs. The purpose of the /loans/40 resource is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No API documentation available — docs, pricing, and README pages all return only a 'Connect wallet' stub
- —Request body schema and response payload structure are completely undocumented
- —The specific meaning of 'loans/40' (loan ID? loan product?) is not explained anywhere in the crawled material
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge on POSThttps://lowpaymentfee.com/api/v1/loans/40
- —Payment settled in USDC on Base network at max 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/loans/40
- —Provider advertises $0.02/request pricing with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/40
- —Docs, pricing, and README pages return only 'Connect wallet' contenthttps://lowpaymentfee.com/docs