Pay-per-call loan data API 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 41) 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 cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is handled entirely through the x402 protocol on the Base L2 network.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific purpose and data shape of the /api/v1/loans/41 endpoint is unclear beyond its generic "Premium API Access" label. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to know what input it expects or what output it produces.
Capabilities
Use cases
- —Retrieving loan data for a specific loan record via pay-per-call
- —Agent-driven data access without API key provisioning
- —Programmatic access to financial data with per-request USDC micropayments
Fit
Best for
- —Agents that need keyless, pay-per-call access to loan data
- —Developers experimenting with x402 payment protocol integrations
- —Use cases requiring no subscription or rate-limit constraints
Not for
- —Production workloads requiring well-documented request/response schemas
- —Users who need bulk or batch loan data retrieval at scale
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/41 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and no examples. The purpose of '/api/v1/loans/41' is opaque — effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.
- —No OpenAPI or schema definition found; request body format and response structure are unknown.
- —The specific data returned by /api/v1/loans/41 is undocumented; 'Premium API Access' is a generic label.
- —The provider lists many diverse API categories (AI, finance, infrastructure) at identical pricing, which may indicate placeholder or demo endpoints.
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/loans/41
- —USDC on Base network, maxAmountRequired 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/loans/41
- —All endpoints priced at $0.02/request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no technical contenthttps://lowpaymentfee.com/docs