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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment protocol means agents or users simply attach a payment header to each HTTP call.
The specific endpoint at `/api/v1/transfers/8` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD) per call on the Base network, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a "Connect wallet" prompt with no further technical detail, so request/response schemas for any endpoint are unknown.
Capabilities
Use cases
- —Agent-driven API consumption where per-call USDC micropayments replace traditional API keys
- —Accessing data analytics, AI inference, or financial data without subscription commitments
- —Programmatic pay-as-you-go access to utility services like geocoding, validation, and conversion
Fit
Best for
- —Developers or agents wanting zero-setup, keyless API access via x402
- —Micropayment experimentation on Base L2 with USDC
- —Scenarios requiring no rate limits and instant access
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where per-call pricing may be inefficient compared to bulk plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/8 \
-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, there is no documentation for the specific /transfers/8 endpoint, no request or response schema, and all doc pages return only 'Connect wallet' with no content. The endpoint's actual functionality is unknown.
Warnings
- —The exact purpose and functionality of /api/v1/transfers/8 ('Premium API Access') is undocumented — it is unclear what data or service it provides.
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no technical content.
- —No request body schema or response schema is available for any endpoint on this platform.
- —The broad range of advertised endpoints (AI, finance, analytics, utilities) could not be verified for actual functionality.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/8
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/8