Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and general-purpose utilities. All endpoints are paid per request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/transactions/26` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via an x402 exact-scheme challenge: the caller includes an X-PAYMENT header with a signed USDC transfer to the provider's address on Base. The endpoint accepts POST requests and returns JSON.
The broader platform advertises additional 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys
- —Fetching real-time crypto token quotes and gas estimates for DeFi workflows
- —Running geocoding or data validation as part of an automated pipeline with per-call billing
- —Exporting analytics data or generating reports via a simple paid HTTP call
Fit
Best for
- —AI agents and bots that can pay per request with USDC on Base
- —Developers who want instant API access without signup or rate limits
- —Low-volume or bursty workloads where flat per-call pricing is cost-effective
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who cannot transact in USDC on the Base network
- —Applications requiring detailed SLAs, uptime guarantees, or dedicated support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/26 \
-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). However, there is no OpenAPI schema, no request/response examples, and documentation pages all resolve to a 'Connect wallet' stub with no usable content. The specific purpose of '/api/v1/transactions/26' labeled 'Premium API Access' is unclear — it doesn't appear in the site's listed catalog, making its actual functionality unknown.
Warnings
- —The specific endpoint /api/v1/transactions/26 is not listed among the site's advertised API catalog; its actual functionality is unknown.
- —Documentation, pricing, and README pages all render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, request schema, or response schema is available — request/response formats must be guessed.
- —The description 'Premium API Access' is generic and does not clarify what data or service this endpoint provides.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/transactions/26 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base.https://lowpaymentfee.com/api/v1/transactions/26
- —The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/transactions/26