Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
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 `/api/v1/payments/179` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or upfront commitments are required — each request is individually settled on-chain.
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 endpoint probed here (`/api/v1/payments/179`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access," and no further documentation, request/response schemas, or examples are available. The docs, pricing, and other pages on the site returned only a "Connect wallet" prompt with no substantive content. Without knowing what this endpoint actually returns, agents should treat it as an opaque paid endpoint with uncertain functionality.
Capabilities
Use cases
- —Programmatic access to a paid API endpoint without needing API key registration
- —Agent-driven workflows that settle per-call costs in USDC on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, on-chain-settled API access
- —Low-cost per-request API consumption without subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before calling
- —Anyone without a Base-network USDC wallet
- —High-throughput use cases where per-call on-chain settlement adds latency
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/179 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.
- —The endpoint path '/api/v1/payments/179' does not match any of the documented API categories on the homepage; its actual functionality is unknown.
- —No request or response schema is provided; callers cannot know what to send or what to expect back.
- —No OpenAPI spec, ai-plugin manifest, or agents.txt discovered.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/payments/179
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/179
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages return only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs