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/267` 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. 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, the crawled documentation pages (docs, api, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual functionality behind each endpoint is unverified. The specific purpose of the `/api/v1/transactions/267` endpoint is unclear from available material.
Capabilities
Use cases
- —Accessing data analytics and reports on a per-request basis without subscriptions
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with micropayments
- —Fetching financial data like exchange rates, token quotes, and gas estimates
- —Using utility services like geocoding, validation, and conversion
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost API calls without managing API keys or rate limits
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/267 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of the /api/v1/transactions/267 endpoint is entirely unclear. The docs, API, pricing, and README pages are all empty stubs.
Warnings
- —The specific functionality of /api/v1/transactions/267 ('Premium API Access') is not documented anywhere — its purpose is unknown.
- —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no actual content.
- —No OpenAPI spec, request schema, or response schema is available.
- —The broad catalog of endpoints (AI, finance, data, utils) is advertised on the landing page but none have been independently verified for functionality.
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/267 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/transactions/267
- —The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com