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 at `/api/v1/transfers/38` is labeled "Premium API Access" and requires a POST request with an x402 payment header. The 402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised.
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 listed at the same $0.02/request price point.
However, the specific functionality behind the `/api/v1/transfers/38` endpoint is unclear. The endpoint path suggests a transfer-related resource, but the description is generic ("Premium API Access") and no request/response schema documentation is available. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further content. Without documentation or example payloads, the actual behavior of this endpoint cannot be confirmed.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without traditional API key registration
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Testing x402 protocol integrations with low-cost endpoints
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that need keyless, pay-per-use API access
- —Users who want to avoid subscription commitments for API usage
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/38 \
-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 no explanation of what the /transfers/38 endpoint actually does. The docs, pricing, and API pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no content
- —The specific functionality of /api/v1/transfers/38 is unknown; the path suggests transfers but the description is generic
- —No request body schema or response schema is documented anywhere
- —No OpenAPI spec, no AI plugin manifest, no agents.txt found
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/38
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base network USDC)https://lowpaymentfee.com/api/v1/transfers/38