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/274` 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 or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
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 functionality behind `/api/v1/transactions/274` is not documented beyond the label "Premium API Access." There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content. The actual behavior of this endpoint after payment is unknown from the available material.
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 keyless, pay-per-use API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without a Base-network USDC wallet
- —High-volume consumers who need bulk pricing or rate-limit guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/274 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific function of /api/v1/transactions/274 is entirely opaque.
Warnings
- —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.
- —The actual functionality and response format of /api/v1/transactions/274 is unknown; 'Premium API Access' is the only descriptor.
- —No OpenAPI or schema provided for request or response bodies.
- —Multiple advertised endpoint categories (AI, finance, analytics, etc.) cannot be verified from crawl data.
Citations
- —Endpoint returns 402 with x402 challenge requiring up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/274
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/274
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructurehttps://lowpaymentfee.com