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 specific loan resource (`/api/v1/loans/59`) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract `0x8335…2913`) with a maximum charge of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises a range of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/loans/59` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to send or what response to expect.
Capabilities
Use cases
- —Retrieving loan data on a per-request payment basis without needing an API key
- —Integrating pay-per-call financial data into agent workflows settled on Base L2
- —Programmatic access to loan information with USDC micropayments
Fit
Best for
- —Agents or applications that need on-demand loan data without subscription commitments
- —Developers experimenting with x402 pay-per-call protocols on Base
- —Low-volume consumers who prefer per-request pricing over monthly plans
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-USDC or non-Base-network payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/59 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on request format, response schema, or what 'loans/59' actually represents. No OpenAPI spec, no examples, and all doc pages are empty wallet-connect stubs. Effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; unknown what data /api/v1/loans/59 returns or what POST body it expects
- —The endpoint path '/api/v1/loans/59' references a specific resource ID (59) with no explanation of what it represents
- —The broader platform lists many endpoint categories but none are documented beyond titles and prices
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/loans/59
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/loans/59
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs