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/135` is listed as "Premium API Access" and advertises a maximum 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 and returns application/json. However, the exact functionality of this particular transactions endpoint is not documented — the site's landing page lists categories like analytics, AI, finance, and utilities but does not include a `/transactions/` route among them.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to be behind a wallet-connect gate and did not yield substantive content during crawling, so detailed request/response schemas for any endpoint are unavailable.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Making one-off paid API calls from an AI agent with x402-compatible wallet
- —Programmatic access to analytics, AI inference, or financial data at micro-transaction pricing
Fit
Best for
- —Developers or agents wanting frictionless pay-per-use API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or bursty workloads where subscription pricing is wasteful
Not for
- —High-volume production workloads needing SLAs or guaranteed uptime
- —Users without a Base-network USDC wallet or x402-capable client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/135 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC per call on Base). However, the specific /transactions/135 endpoint has no documentation, no request/response schema, and its purpose is unclear. All doc pages are gated behind wallet-connect and returned no content. This is effectively a stub listing.
Warnings
- —The /api/v1/transactions/135 endpoint is not listed among the site's documented API categories — its exact functionality is unknown.
- —All documentation pages (docs, pricing, README) are behind a wallet-connect gate and returned no usable content.
- —No OpenAPI spec, request schema, or response schema is available for any endpoint.
- —The purpose of 'Premium API Access' at this specific transactions path is ambiguous.
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/135 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/transactions/135
- —The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.https://lowpaymentfee.com