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/146` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
The broader platform offers endpoints across four categories: 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 priced uniformly at $0.02 per request.
However, the specific functionality of the `/api/v1/transfers/146` endpoint is not documented beyond its title "Premium API Access." The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for any endpoint. The endpoint is confirmed live (402 challenge captured), but what it actually returns after payment is unknown.
Capabilities
Use cases
- —Programmatic access to premium API data with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless API access with crypto micropayments
- —Users who want per-request billing without subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base network USDC wallet
- —Production workloads requiring well-documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/146 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific endpoint path '/api/v1/transfers/146' doesn't match any of the advertised categories, making its purpose unclear.
Warnings
- —No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content
- —The specific endpoint /api/v1/transfers/146 is not listed among the advertised API categories on the homepage
- —No OpenAPI schema or request/response examples available
- —Actual response payload after payment is completely unknown
- —The platform's advertised endpoints (AI, analytics, finance, etc.) may be placeholders — no evidence of real functionality
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transfers/146
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, pricing, and API pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs