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 collection 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 x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately.
The specific endpoint at `/api/v1/transfers/36` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/transfers/36` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" provides beyond the generic label.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without managing API keys or subscriptions
- —Agent-driven workflows that need inline micropayment settlement per request
- —Exploring x402 protocol integration for pay-as-you-go services
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that need keyless, per-call API access settled in USDC
- —Low-volume consumers who want zero-commitment pricing
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production workloads requiring SLAs or guaranteed uptime
- —Anyone who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/36 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/transfers/36' ('Premium API Access') is entirely opaque. All doc pages render only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc/pricing/API pages show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The purpose and output of '/api/v1/transfers/36' is unknown beyond the label 'Premium API Access'
- —No request or response examples available anywhere in crawled content
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transfers/36
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/36
- —Docs, API, pricing, and README pages all render only 'Connect wallet'https://lowpaymentfee.com/docs