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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transfers/91` is listed as "Premium API Access" and accepts POST requests settled via the x402 exact-payment scheme.
The platform advertises 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 (geocoding, validation, conversion, generation). All endpoints appear to follow the same $0.02 pricing model.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The x402 challenge for this specific endpoint confirms it is live, accepting POST requests, and requires payment of up to 20,000 base units of USDC (i.e., $0.02) on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration
- —Fetching real-time financial data like token prices, exchange rates, and gas estimates on a per-call basis
- —Running data analytics queries and exporting data with instant pay-per-use billing
- —Using utility services like geocoding, validation, and conversion without subscription overhead
Fit
Best for
- —Agents or developers wanting zero-signup, pay-per-call API access
- —Use cases requiring low-cost micropayments ($0.02) settled on Base in USDC
- —Prototyping or low-volume usage where subscriptions are unnecessary
Not for
- —High-volume production workloads where per-request pricing may add up quickly
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating
Quick start
# Pay $0.02 in USDC on Base via x402 to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/transfers/91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the specific /transfers/91 endpoint is unclear beyond its generic 'Premium API Access' label. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request/response formats for any endpoint
- —The specific purpose of /api/v1/transfers/91 ('Premium API Access') is not documented — unclear what it returns
- —No request or response examples available from any source
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/transfers/91 requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transfers/91
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs