Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall, settling payments in USDC on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests, charging up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 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 multiple API 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 priced at $0.02 per request. However, this specific listing is for `/api/resource/26`, which is described only as "Premium API Access" with no further documentation on what data or functionality it returns. The docs, pricing, and README pages on the site are gated behind a wallet-connect flow and yielded no additional content during crawl.
Because there is no OpenAPI schema, no request/response examples, and no documentation explaining what `/api/resource/26` actually does, the practical utility of this endpoint cannot be confirmed from available materials. The payment mechanism is verified live and functional via the captured 402 challenge.
Capabilities
Use cases
- —Accessing a premium API endpoint with per-request USDC micropayments on Base
- —Integrating pay-as-you-go API calls into agent workflows without API key management
- —Demonstrating x402 protocol payment flows for developer experimentation
Fit
Best for
- —Developers exploring x402 protocol integrations
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, pay-per-call API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Applications requiring free or fiat-settled API access
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/26 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/resource/26 actually returns. No OpenAPI schema, no request/response examples, and the site's docs pages are empty behind a wallet-connect gate. This is effectively a stub listing.
Warnings
- —No documentation available for /api/resource/26 — the endpoint's actual functionality is unknown.
- —No OpenAPI or output schema provided beyond basic HTTP method info.
- —All docs/pricing/README pages on the site returned only a 'Connect wallet' prompt with no usable content.
- —The endpoint path '/api/resource/26' does not match any of the advertised API paths on the landing page.
Citations
- —The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/resource/26
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/resource/26
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructurehttps://lowpaymentfee.com