Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled on the Base network using the x402 protocol and USDC. The specific endpoint at `/api/resource/7` is labeled "Premium API Access" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no subscriptions — just an x402 payment header with each request.
The broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request. The x402 challenge for `/api/resource/7` specifies a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals.
Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what `/api/resource/7` actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific resource provides.
Capabilities
Use cases
- —Programmatic access to premium API resources without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand, per-call billing via crypto
- —Testing x402 protocol integrations with a low-cost live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —AI agents that need keyless, pay-as-you-go API access
- —Low-volume consumers who want per-request pricing with no commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads requiring bulk pricing or rate-limit guarantees
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/7 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The purpose of `/api/resource/7` specifically is undocumented, making this effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content.
- —The specific resource at /api/resource/7 has no description of what it returns or what input it expects.
- —No OpenAPI or output schema provided beyond basic HTTP method and mime type.
- —Platform lists many endpoint categories (AI, finance, data, infra) but none are documented with schemas or examples.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/resource/7
- —Platform advertises endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, pricing, and API pages render only a 'Connect wallet' prompt with no further contenthttps://lowpaymentfee.com/docs