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/transfers/85` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.
The 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 utilities (geocoding, validation, conversion, generation). All endpoints follow the same pricing model. However, the specific functionality behind the `/api/v1/transfers/85` path is not documented — the crawled pages only show the generic "Premium API Access" label with no schema, input/output examples, or detailed documentation.
Documentation pages (/docs, /api, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior, request format, and response format of this endpoint remain unknown. Agents should be aware that while the x402 challenge is live and well-formed, the lack of documentation makes it difficult to know what this specific endpoint returns.
Capabilities
Use cases
- —Programmatic access to API services with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Exploring x402 protocol integrations on Base network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base
- —Users who want no-signup, no-API-key access to utility endpoints
Not for
- —Users who need detailed API documentation or schemas before calling
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone without a Base-compatible USDC wallet
Quick start
# The endpoint requires an x402 X-PAYMENT header with USDC on Base.
# Use an x402-compatible client to handle the 402 challenge automatically.
curl -X POST https://lowpaymentfee.com/api/v1/transfers/85 \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/request. However, there is no documentation, no input/output schema, no examples, and the specific purpose of /api/v1/transfers/85 is entirely unclear. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —The specific functionality of /api/v1/transfers/85 is undocumented — 'Premium API Access' is the only label provided.
- —All documentation pages (/docs, /api, /pricing, /README) returned no substantive content, only a 'Connect wallet' prompt.
- —No OpenAPI spec, no request/response schema, and no examples are available.
- —The endpoint path 'transfers/85' suggests a resource-specific route but its purpose is unknown.
Citations
- —The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transfers/85
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com