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/122` is listed as "Premium API Access" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.
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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per call.
The probed endpoint at `/api/v1/transfers/122` returned a valid x402 challenge with a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this equals $0.02, consistent with the advertised pricing. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. However, the specific functionality behind the `/api/v1/transfers/122` endpoint is unclear — the name "Premium API Access" and the path segment "transfers/122" do not clearly describe what data or service is returned. Documentation pages (docs, pricing, README) all rendered only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to various utility and data endpoints
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments in USDC on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation before integrating
- —Applications requiring free or subscription-based API access
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/122 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/transfers/122 is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The endpoint's purpose cannot be determined from available material.
Warnings
- —The specific functionality of /api/v1/transfers/122 ('Premium API Access') is not documented — it is unclear what data or service this endpoint provides.
- —All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no usable content.
- —No OpenAPI spec, request schema, or response schema is available.
- —The path 'transfers/122' suggests a resource-specific endpoint (possibly a single transfer record), but this is speculative.
Citations
- —Platform advertises $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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/transfers/122
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com