Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/54` is listed as "Premium API Access" and returns `application/json` via POST.
The platform advertises four main 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 call.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The x402 challenge for this specific endpoint confirms it is live, accepting POST requests, and requires payment of up to 20,000 base units of USDC (i.e., $0.02) on Base network to address 0x1A2B...85F3.
Capabilities
Use cases
- —Accessing premium API data without needing API key registration
- —Making one-off paid API calls settled instantly in USDC on Base
- —Integrating pay-per-use analytics, AI inference, or financial data into agent workflows
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost micropayment-gated endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring free or subscription-based API access
- —Use cases needing high-throughput batch processing with volume discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/54 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of this specific endpoint (/api/v1/transactions/54) is unclear beyond the generic label "Premium API Access."
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; it is unknown what input this endpoint expects or what it returns.
- —The specific function of /api/v1/transactions/54 ('Premium API Access') is not explained anywhere in the crawled material.
- —This endpoint is not listed among the advertised API catalog on the homepage, raising questions about its purpose.
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base network.https://lowpaymentfee.com/api/v1/transactions/54
- —The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompt.https://lowpaymentfee.com/docs