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/transactions/281` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader 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). However, the specific functionality behind the `/api/v1/transactions/281` path is not documented beyond the generic "Premium API Access" label, and the docs, pricing, and API pages all render only a wallet-connect prompt with no further detail.
Capabilities
Use cases
- —Accessing data analytics and reports on a per-request basis without subscriptions
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments
- —Fetching financial data like exchange rates, token quotes, and gas estimates via micropayments
- —Using utility services like geocoding, validation, and conversion without API key management
Fit
Best for
- —Developers who want pay-as-you-go API access without accounts or API keys
- —Agents and bots that can settle payments programmatically via x402 on Base
- —Low-volume or sporadic API consumers who don't want subscription commitments
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs
- —Consumers without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/281 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is essentially no documentation for what this specific endpoint does. The docs, pricing, and API pages all render only a wallet-connect prompt. No OpenAPI spec, no request/response schemas, and no examples are available. The "Premium API Access" label is generic and uninformative.
Warnings
- —The specific functionality of /api/v1/transactions/281 is undocumented — 'Premium API Access' is the only description available.
- —All documentation pages (docs, pricing, api, README) render only a wallet-connect prompt with no actual content.
- —No OpenAPI spec or request/response schema is provided for any endpoint.
- —The broad catalog of endpoints listed on the homepage cannot be verified as functional from the crawl data alone.
Citations
- —All endpoints are priced at $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/281 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/transactions/281
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com