Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/341` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.
The broader platform offers 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 endpoints are priced uniformly at $0.02 per request.
However, the specific functionality of the `/api/v1/transactions/341` endpoint is unclear. The description is simply "Premium API Access" with no further documentation, input schema, or example responses available. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional content. Without documentation or output schema details, callers cannot know what data or service this particular endpoint returns.
Capabilities
Use cases
- —Programmatic access to premium API data with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Exploring x402 protocol integration for crypto-native applications
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless API access with crypto micropayments
- —Low-volume, on-demand API consumers who prefer pay-per-call pricing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Developers without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/341 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no example requests or responses, and the purpose of this specific endpoint (/api/v1/transactions/341) is entirely opaque. The docs pages render only 'Connect wallet' with no usable content.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —The specific functionality of /api/v1/transactions/341 is unknown; 'Premium API Access' is not descriptive
- —No input or output schema provided beyond the x402 challenge metadata
- —No example responses available to verify what data is returned
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/341
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/341
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com