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 `/api/v1/transfers/118` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, subscriptions, or rate limits are required — each request is paid individually via the x402 payment header.
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 and settle in USDC on Base.
The specific functionality behind the `/api/v1/transfers/118` endpoint is unclear from available documentation. The endpoint accepts POST requests and returns `application/json`. Documentation pages (`/docs`, `/pricing`, `/README`) all resolve to a minimal "Connect wallet" page with no further technical detail, so the actual request/response schema for this endpoint is unknown.
Capabilities
Use cases
- —Accessing premium API data without requiring API keys or subscriptions
- —Making one-off API calls paid in USDC on Base
- —Agent-driven workflows that need permissionless, pay-as-you-go API access
Fit
Best for
- —Developers who want zero-signup API access paid in crypto
- —AI agents that need to autonomously purchase API calls
- —Users already holding USDC on Base network
Not for
- —Users who need detailed API documentation or schemas before integrating
- —Anyone without USDC on Base network or an x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/118 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, the actual functionality of /api/v1/transfers/118 is completely undocumented — no input schema, no response schema, no examples. All documentation pages return only 'Connect wallet' with no content. This is effectively a stub listing.
Warnings
- —The specific purpose and functionality of /api/v1/transfers/118 ('Premium API Access') is not documented anywhere.
- —All documentation pages (/docs, /pricing, /README) contain no useful content — only 'Connect wallet'.
- —No input or output schema is available for this endpoint.
- —The platform lists many API categories (AI, finance, analytics, infrastructure) but provides no evidence these endpoints return real data.
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/transfers/118
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/118
- —Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com