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/369` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises categories including: 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). However, documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no actual technical documentation, so the specific request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Accessing data analytics and metrics without creating an account or managing API keys
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments
- —Fetching financial data like exchange rates, token quotes, and gas estimates via micropayments
- —Using utility services like geocoding, validation, and data conversion on demand
Fit
Best for
- —Agents or developers who want zero-friction API access without signup or subscriptions
- —Crypto-native applications that can settle payments in USDC on Base
- —Low-volume or sporadic API consumers who benefit from pure pay-per-use pricing
Not for
- —High-volume consumers who need bulk pricing or rate-limited throughput guarantees
- —Users without a Base-compatible wallet or USDC holdings
- —Anyone needing detailed API documentation or guaranteed SLAs — docs are currently empty
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/369 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, and the landing page describes the platform's catalog and pricing. However, all documentation pages are empty (showing only 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and the specific functionality of /api/v1/transactions/369 ('Premium API Access') is entirely opaque. This is effectively a stub listing.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) returned no content — only a 'Connect wallet' prompt
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose of /api/v1/transactions/369 ('Premium API Access') is unclear — it does not match any of the advertised endpoint categories on the landing page
- —Request and response body schemas are completely unknown
Citations
- —All endpoints priced at $0.02 per request 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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeouthttps://lowpaymentfee.com/api/v1/transactions/369
- —Platform offers categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no technical contenthttps://lowpaymentfee.com/docs