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/196` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — 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 uniformly priced at $0.02 per request. However, this specific endpoint (`/api/v1/transfers/196`) is labeled generically as "Premium API Access" and does not appear in the site's listed API catalog, so its exact functionality is unclear.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular transfer endpoint returns or expects as input.
Capabilities
Use cases
- —Accessing paid API services without traditional API key registration
- —Making one-off API calls with per-request USDC micropayments on Base
- —Agent-driven workflows that need frictionless pay-as-you-go access
Fit
Best for
- —Developers who want zero-signup, pay-per-use API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
- —High-volume consumers who would benefit from bulk pricing
Quick start
# Send a POST with x402 payment header
curl -X POST https://lowpaymentfee.com/api/v1/transfers/196 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of this '/transfers/196' endpoint is unknown. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —The exact functionality of /api/v1/transfers/196 is undocumented and unclear — it does not appear in the site's listed API catalog.
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no substantive content.
- —No OpenAPI schema, request format, or response examples are available.
- —The endpoint path suggests a resource-specific ID (196), which may not be stable or generalizable.
Citations
- —Uniform pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transfers/196
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com