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/156` is listed as "Premium API Access" and accepts POST requests with payment via the x402 exact scheme. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request given USDC's 6 decimals.
The broader platform advertises multiple API categories including 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 with no API keys, no rate limits, and no minimum commitments required.
However, the specific functionality of the `/api/v1/transfers/156` endpoint is unclear — it does not map to any of the documented API categories on the landing page, and the description "Premium API Access" is generic. Documentation pages (/docs, /api, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform.
Capabilities
Use cases
- —Accessing premium API endpoints with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to data, AI, finance, or utility endpoints without subscriptions
Fit
Best for
- —Developers who want to pay per request without API key management
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayment access to API services
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
- —High-volume use cases where per-request pricing may be inefficient
Quick start
# The endpoint requires an x402 payment header (USDC on Base, $0.02/call)
curl -X POST https://lowpaymentfee.com/api/v1/transfers/156 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no meaningful documentation (all doc pages show only 'Connect wallet'), and the specific purpose of /api/v1/transfers/156 is undocumented. The listing is effectively a stub.
Warnings
- —The specific endpoint /api/v1/transfers/156 is not listed among the documented APIs on the landing page — its actual functionality is unknown.
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI schema, request format, or response examples are available for any endpoint.
- —The platform's actual data sources and AI model capabilities are unverified — the landing page lists categories but provides no technical details.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transfers/156
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages return only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs