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. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/78` is listed as "Premium API Access" and advertises a max cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The x402 challenge confirms it accepts POST requests, returns application/json, and settles to address 0x1A2B…85F3 on Base. The payment scheme is "exact" with a 300-second timeout.
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 but appear to require wallet connection and contain no visible content. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found in the crawl.
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 as a utility service from an autonomous agent
- —Exporting analytics data or generating insights reports on a pay-as-you-go basis
Fit
Best for
- —AI agents that need diverse API capabilities behind a single payment protocol
- —Developers who want zero-signup, pay-per-use access to common API services
- —Web3-native applications already operating on Base with USDC
Not for
- —High-volume production workloads where per-request costs add up (no bulk discounts documented)
- —Users who need detailed API documentation, request schemas, or SLA guarantees before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/78 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but the endpoint path '/api/v1/transactions/78' is generic ('Premium API Access') with no documentation on what it actually does. No OpenAPI schema, no request/response examples, and all doc pages require wallet connection with no visible content. The platform's purpose and individual endpoint behavior are largely opaque.
Warnings
- —The specific endpoint /api/v1/transactions/78 has no documentation explaining its function beyond 'Premium API Access'
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content
- —No OpenAPI or JSON schema is available for any endpoint
- —No request or response examples could be found — input format and output structure are unknown
- —It is unclear whether the listed AI/ML and data endpoints are fully functional or placeholders
Citations
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/transactions/78
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Documentation pages show only 'Connect wallet' with no visible contenthttps://lowpaymentfee.com/docs