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. 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/transactions/186` is listed as "Premium API Access" and returns `application/json` via POST.
The platform advertises four endpoint 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 follow the x402 payment protocol — callers send an `X-PAYMENT` header containing a signed USDC payment on Base, and the server fulfills the request once payment is verified.
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 schema, no request/response examples, and no detailed description of what the `/api/v1/transactions/186` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts up to 20,000 base units of USDC (i.e., $0.02) per call.
Capabilities
Use cases
- —Accessing analytics metrics and reports on a per-call basis without subscription
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-request USDC payments
- —Fetching real-time crypto prices, gas estimates, and exchange rates
- —Geocoding, data validation, and format conversion via utility endpoints
Fit
Best for
- —Developers who want API access without API keys or rate limits
- —Agents and bots that can settle x402 micropayments in USDC on Base
- —Projects needing low-cost, pay-as-you-go access to diverse API categories
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Applications requiring high-throughput bulk access with negotiated pricing
- —Developers without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/186 \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but documentation is effectively nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the specific /api/v1/transactions/186 endpoint returns. The listing is largely a stub.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.
- —No OpenAPI or JSON schema available — request and response formats are unknown.
- —The specific purpose of /api/v1/transactions/186 ('Premium API Access') is not described anywhere; it is unclear what data it returns.
- —The platform lists many endpoint categories but none have documented schemas or examples.
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/transactions/186 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base.https://lowpaymentfee.com/api/v1/transactions/186
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.https://lowpaymentfee.com
- —Documentation, API, pricing, and README pages render only a 'Connect wallet' prompt.https://lowpaymentfee.com/docs