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/34` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
The broader platform offers endpoints across four categories: 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/request price point.
However, documentation is extremely thin. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/transactions/34` ("Premium API Access") is not described beyond its title, making it unclear what data or service it actually returns.
Capabilities
Use cases
- —Accessing data analytics and reports on a per-request payment basis without subscription
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments
- —Fetching crypto price feeds, gas estimates, and exchange rates via micropayments
- —Geocoding and data conversion utilities paid per use
Fit
Best for
- —Developers who want API access without managing API keys or subscriptions
- —Agents and bots that can settle payments programmatically via x402 on Base
- —Low-volume or sporadic API consumers who prefer pay-as-you-go pricing
Not for
- —High-volume production workloads needing guaranteed SLAs and detailed documentation
- —Users who need well-documented request/response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/34 \
-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 spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The actual functionality of this specific endpoint is undescribed. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — all docs/pricing/README pages return only 'Connect wallet'
- —The specific functionality of /api/v1/transactions/34 ('Premium API Access') is not described anywhere
- —No request body schema or response schema is documented
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/34
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, instant access, and Base network settlementhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/34