Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.
The specific endpoint at `/api/v1/item/26` 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 platform advertises four categories of APIs: 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 specific functionality behind `/api/v1/item/26` is not documented beyond the generic "Premium API Access" label, and the docs, pricing, and API pages all appear to be behind a wallet-connect gate with no further content available.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without signup or API keys
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting data with micropayment-based access control
- —Using utility services like geocoding, validation, and conversion without rate limits
Fit
Best for
- —Agents and bots that need instant, keyless API access via crypto micropayments
- —Developers prototyping with low-cost, no-commitment API calls
- —Web3-native applications that already hold USDC on Base
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume production workloads where per-request crypto payments add latency or cost overhead
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/26 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'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 functionality of /api/v1/item/26 is entirely unclear. The docs, pricing, and API pages are all gated behind wallet-connect with no visible content.
Warnings
- —The specific functionality of /api/v1/item/26 ('Premium API Access') is not documented — it is unclear what data or service this endpoint provides.
- —No OpenAPI spec, request schema, or response schema is available.
- —All documentation pages (docs, pricing, API, README) appear to be behind a wallet-connect gate and returned no useful content.
- —The platform lists many endpoints on its landing page, but none have detailed documentation visible in the crawl.
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02.https://lowpaymentfee.com/api/v1/item/26
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com