Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/304` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/payments/304` endpoint is not documented beyond the label "Premium API Access," and the crawled docs, pricing, and README pages returned only a wallet-connect prompt with no additional content.
Because there is no OpenAPI schema, no request/response examples, and no documentation describing what this particular endpoint actually returns, the listing carries significant uncertainty. The x402 challenge is valid and the endpoint is live, but prospective callers have no way to know what data or service they will receive for their $0.02 payment.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents that can settle USDC on Base for per-call API access
- —Use cases requiring no-signup, no-rate-limit API consumption
Not for
- —Users who need detailed documentation or guaranteed SLAs before paying
- —Anyone without a Base-network USDC wallet
- —High-volume batch workloads where $0.02/request adds up quickly
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/304 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The 'Premium API Access' label is uninformative.
Warnings
- —No documentation available — docs, pricing, and README pages all return only a wallet-connect prompt with no content.
- —The specific functionality of /api/v1/payments/304 ('Premium API Access') is completely undocumented; callers cannot know what they are paying for.
- —No OpenAPI schema or request/response examples are provided.
- —The broader platform lists many endpoint categories (AI, analytics, finance, etc.) but none are documented beyond titles and prices.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/payments/304
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Docs, pricing, and README pages returned only a wallet-connect prompt with no substantive contenthttps://lowpaymentfee.com/docs