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, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transfers/189` is listed as "Premium API Access" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests.
The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The specific functionality behind the `/api/v1/transfers/189` path is unclear — the name "Premium API Access" is generic and the transfer-style URL pattern does not map obviously to any of the advertised API categories.
Capabilities
Use cases
- —Accessing data analytics and reports without creating an account or managing API keys
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments
- —Fetching financial data like price feeds, exchange rates, and gas estimates via micropayments
- —Agent-driven workflows that need permissionless, pay-as-you-go API access
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-use API access
- —Crypto-native applications that can settle payments in USDC on Base
- —Prototyping and low-volume usage where flat per-request pricing is convenient
Not for
- —High-volume production workloads where per-request costs add up quickly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/189 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of the /api/v1/transfers/189 endpoint is ambiguous. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No API documentation available — all doc pages return only a 'Connect wallet' prompt
- —The specific function of /api/v1/transfers/189 ('Premium API Access') is unclear and does not match any advertised API category
- —No request or response schema is provided; callers cannot know what to send or expect back
- —The breadth of advertised capabilities (AI, finance, analytics, utils) is unverified
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transfers/189
- —Platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Documentation, pricing, and README pages all returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs