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 collection 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, no rate limits, and no commitments required.
The specific endpoint at `/api/v1/transactions/258` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.
The broader platform advertises endpoints in 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). Documentation pages exist at /docs, /pricing, /api, and /README but all currently render only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment
- —Running geocoding or data validation tasks with no subscription commitment
- —Exporting analytics data or generating insights on a pay-as-you-go basis
Fit
Best for
- —AI agents that need keyless, pay-per-use access to diverse API endpoints
- —Developers prototyping with low-cost, no-commitment API calls
- —Web3-native applications already operating on the Base network
Not for
- —High-volume production workloads where per-request pricing adds up quickly
- —Users who need detailed API documentation and well-defined request/response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/258 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation pages are empty (all show only 'Connect wallet'), there is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/transactions/258 ('Premium API Access') is vague and undifferentiated from the other $0.02 endpoints. This is effectively a stub listing.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no actual content
- —No OpenAPI or schema available — request and response formats for this endpoint are unknown
- —The endpoint path '/api/v1/transactions/258' with description 'Premium API Access' is vague; its specific functionality is unclear
- —Cannot verify what data or service this specific endpoint actually returns
Citations
- —Platform offers endpoints at $0.02/request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com
- —x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transactions/258
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com