Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-5`) is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com 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 share the same $0.02/request pricing. However, this particular endpoint (`/api/endpoint-5`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.
The x402 challenge was successfully captured (HTTP 402 with valid accepts payload), confirming the endpoint is live. Documentation beyond the landing page is essentially empty — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed description of what `/api/endpoint-5` actually returns.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-request USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API calls settled on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows on Base
- —AI agents that need keyless pay-per-call API access
- —Micropayment use cases where $0.02/request is acceptable
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone requiring a well-documented, specific-purpose API (endpoint function is unclear)
- —High-volume use cases where per-request crypto settlement overhead matters
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-5 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of /api/endpoint-5 is unknown — it doesn't match any named endpoint on the landing page. This is effectively a stub listing.
Warnings
- —The endpoint path /api/endpoint-5 does not match any of the named endpoints listed on the lowpaymentfee.com landing page; its actual functionality is unknown.
- —No OpenAPI schema, request format, or response format documentation is available.
- —All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no useful content.
- —Cannot verify what data or service this endpoint actually provides.
Citations
- —The x402 challenge returns HTTP 402 with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/endpoint-5
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/endpoint-5
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com