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/64` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header with each request.
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 listed at the same $0.02 per request price point and settle via USDC on Base.
However, the specific functionality of the `/api/v1/transactions/64` endpoint is unclear. The description is simply "Premium API Access" with no further documentation about what data it returns or what input it expects. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response examples, and no detailed documentation available from the crawl.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to various utility and data endpoints
Fit
Best for
- —Developers wanting zero-signup, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users already holding USDC on Base network
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without USDC on Base network or an x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/64 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI spec, no request/response examples, and the endpoint's actual functionality is completely undescribed beyond the generic label 'Premium API Access'. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no technical content
- —The specific functionality of /api/v1/transactions/64 is unknown; 'Premium API Access' is not descriptive
- —No OpenAPI spec or request/response schema provided
- —No example inputs or outputs available to verify what this endpoint actually does
- —The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have visible documentation
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/transactions/64
- —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 offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/64