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/129` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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 at $0.02 per request.
However, the specific endpoint being listed here (`/api/v1/transfers/129`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access," and no documentation, request schema, or response schema is available for this particular path. The docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without further documentation, the exact functionality of this endpoint remains unclear.
Capabilities
Use cases
- —Programmatic access to premium API services with per-call USDC micropayments
- —Agent-driven workflows that need keyless, instant API access on Base
- —Integrating pay-as-you-go API calls without subscription commitments
Fit
Best for
- —Developers wanting no-signup, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost micropayment-gated endpoints
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Applications requiring free or subscription-based access models
- —Use cases needing non-USDC or non-Base-network payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/129 \
-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 request/response schema, and the specific endpoint path '/api/v1/transfers/129' does not correspond to any documented API on the site. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.
- —The endpoint path /api/v1/transfers/129 does not match any of the documented API categories on the landing page; its actual functionality is unknown.
- —No request or response schema is provided; callers cannot know what to send or what to expect back.
- —No OpenAPI spec or AI plugin manifest found.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/transfers/129
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/transfers/129
- —The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com