Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.
The specific endpoint at `/api/v1/transfers/93` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises categories including: metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The specific functionality behind the `/api/v1/transfers/93` path is unclear — the name "Premium API Access" is generic and no input/output schema details are provided beyond the x402 challenge metadata.
Capabilities
Use cases
- —Programmatic access to various data, AI, finance, and utility endpoints without API key management
- —Agent-driven workflows that need instant, keyless API access settled in USDC on Base
- —Prototyping integrations where per-call pricing avoids subscription commitments
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or bursty workloads where flat per-request pricing is economical
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/request adds up significantly
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and the specific purpose of the /transfers/93 endpoint is unknown. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —The exact functionality of /api/v1/transfers/93 ('Premium API Access') is undocumented and unclear
- —All documentation pages (/docs, /pricing, /README, /api) returned no useful content — only 'Connect wallet'
- —No input or output schema is available; request body format is unknown
- —The platform lists many endpoint categories but none are individually documented or verified
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/93
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transfers/93