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-8`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (0.02 USD) per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises endpoints across several 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, this particular endpoint path (`/api/endpoint-8`) does not correspond to any of the named endpoints on the landing page, so its exact functionality is unclear.
The endpoint accepts POST requests and returns `application/json`. Payment is settled on the Base network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content during the crawl.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without needing API keys or subscriptions
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents that can autonomously pay for API calls via crypto
- —Users who want no-commitment, pay-as-you-go API access
Not for
- —Users who need detailed documentation or well-defined input/output schemas before integrating
- —Anyone requiring fiat-only payment methods (this endpoint requires USDC on Base)
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-8 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the exact functionality of /api/endpoint-8 is unknown — it doesn't map to any named endpoint on the site. Documentation pages returned no content. No input/output schema, no examples, and no description of what the endpoint actually does.
Warnings
- —The path /api/endpoint-8 does not correspond to any named endpoint on the lowpaymentfee.com landing page; its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.
- —No input or output schema is available beyond the basic x402 outputSchema stub.
- —The site appears to be a demonstration or placeholder platform; endpoint reliability and data quality are unverified.
Citations
- —The x402 challenge returns status 402 with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/endpoint-8
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/endpoint-8
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com