Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, rate limits, or subscriptions required.
The specific endpoint at `/api/v1/transfers/6` is labeled "Premium API Access" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to the specified payTo address, with a 300-second timeout window.
The broader platform lists 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 identically at $0.02. Documentation pages exist but appear to require wallet connection and contain no visible content beyond that prompt, so detailed request/response schemas are unavailable.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
- —Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment
- —Running data analytics or export jobs paid individually via USDC on Base
- —Geocoding or data validation as a utility service with no subscription commitment
- —Demonstrating or testing x402 payment protocol integrations
Fit
Best for
- —AI agents and bots that can pay per-call via x402/USDC on Base
- —Developers wanting zero-setup API access without registration or API keys
- —Low-volume or bursty workloads where subscription pricing is wasteful
Not for
- —High-volume production workloads where per-call pricing at $0.02 adds up quickly
- —Users who cannot transact in USDC on the Base network
- —Applications requiring detailed SLAs, guaranteed uptime, or enterprise support
Quick start
# Pay $0.02 in USDC on Base per call via x402
curl -X POST https://lowpaymentfee.com/api/v1/transfers/6 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and all docs/pricing/README pages return only a 'Connect wallet' prompt with no usable content. The specific purpose of the /api/v1/transfers/6 endpoint beyond 'Premium API Access' is unknown.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are entirely unknown for this endpoint
- —All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no visible content
- —The specific function of /api/v1/transfers/6 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint
- —The platform lists many endpoint categories but none have documented schemas or example payloads
Citations
- —Flat pricing of $0.02 per request across all endpointshttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transfers/6
- —Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com