Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/335` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.
The broader platform advertises multiple API 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 utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
However, the specific endpoint probed (`/api/v1/transactions/335`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access" with no further documentation on what data or functionality it returns. The docs, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unclear.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Programmatic access to various utility and data endpoints without subscriptions
Fit
Best for
- —Developers who want to pay per request without API key management
- —AI agents with x402-compatible wallets on Base network
- —Low-volume or bursty usage patterns where subscriptions are wasteful
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/335 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific endpoint's purpose ("Premium API Access" at /api/v1/transactions/335) is unexplained. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.
- —The endpoint path /api/v1/transactions/335 does not correspond to any of the documented API categories on the landing page.
- —No OpenAPI schema, request body schema, or response examples are available.
- —Actual functionality behind 'Premium API Access' is unknown — the description is generic.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/335
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/335
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com