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, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/279` 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. 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 beyond the landing page are gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not available from the crawl. The actual functionality behind this specific `/transactions/279` endpoint is unclear — the description is generic ("Premium API Access") and does not specify what data or service it provides.
Capabilities
Use cases
- —Accessing data analytics and reports on a per-request basis without subscriptions
- —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 crypto micropayments
- —Using utility services like geocoding and validation without API key management
Fit
Best for
- —Developers who want zero-commitment, pay-as-you-go API access
- —Agents and bots that can settle payments in USDC on Base via x402
- —Projects needing quick API access without signup or key provisioning
Not for
- —Users who need detailed API documentation and schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/279 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation accessible without wallet connection, no request/response examples, and the specific purpose of /api/v1/transactions/279 is entirely unclear beyond the generic label 'Premium API Access'. This is effectively a stub listing.
Warnings
- —The specific functionality of /api/v1/transactions/279 is not documented — 'Premium API Access' is a generic label with no detail on what data or service is returned.
- —All documentation pages (/docs, /api, /pricing, /README) are gated behind wallet connection and returned no useful content.
- —No OpenAPI spec, request schema, or response schema is available.
- —The platform lists many endpoint categories (AI, finance, analytics, utilities) but none could be verified for actual functionality from the crawl.
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/279
- —Payment scheme is 'exact' with 300-second timeout, endpoint accepts POST and returns application/jsonhttps://lowpaymentfee.com/api/v1/transactions/279