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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments required. Payments settle in USDC on the Base network.
The specific endpoint at `/api/v1/transfers/167` 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 given USDC's 6 decimals. The platform advertises a uniform $0.02 per request across all its endpoints.
The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data export. However, 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 documentation for any endpoint, including this one. The actual functionality behind `/api/v1/transfers/167` (labeled "Premium API Access") is unclear and not described beyond its title.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to various data, AI, finance, and utility endpoints without subscription
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments on Base in USDC
- —Users who prefer crypto micropayments over traditional API key subscriptions
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request pricing may add up compared to flat-rate plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/167 \
-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 OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint ('Premium API Access' at /transfers/167) is completely undescribed. Docs pages return only 'Connect wallet' with no content.
Warnings
- —No OpenAPI schema or endpoint documentation available
- —The specific functionality of /api/v1/transfers/167 ('Premium API Access') is not described anywhere
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no useful content
- —No request or response examples available — integration requires trial and error
- —This endpoint path (/transfers/167) does not appear in the site's listed API catalog, making its purpose unclear
Citations
- —Uniform pricing of $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (equals $0.02)https://lowpaymentfee.com/api/v1/transfers/167
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transfers/167