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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/products/55` is listed as "Premium API Access" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The platform also advertises AI endpoints (sentiment analysis, text summarization, classification, embeddings), finance endpoints (price feeds, exchange rates, token quotes, gas estimates), data endpoints (metrics, reports, export, insights), and utility endpoints (geocoding, validation, conversion, generation). However, documentation is extremely sparse — the docs, pricing, API, 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 usage examples available from the crawled content.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting reports with per-request billing
- —Using utility services like geocoding and validation without subscription commitments
Fit
Best for
- —Agents and developers who want zero-setup, keyless API access paid in USDC
- —Low-volume or bursty workloads where per-request pricing avoids subscription waste
- —Web3-native applications that can settle payments on Base
Not for
- —High-volume production workloads where per-request crypto payments add latency and cost overhead
- —Teams requiring detailed API documentation, SLAs, or enterprise support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/55 \
-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 on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages render only a wallet-connect prompt. The purpose of the specific /api/v1/products/55 endpoint is opaque beyond its title "Premium API Access". Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'
- —The specific purpose and expected input/output of /api/v1/products/55 is undocumented
- —No request or response examples could be sourced
- —The broad catalog of endpoints listed on the homepage cannot be independently verified for functionality
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base networkhttps://lowpaymentfee.com/api/v1/products/55
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/products/55
- —Platform advertises AI, finance, data, and utility endpoint categorieshttps://lowpaymentfee.com