Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request, and the server fulfills the call once payment is verified.
The specific endpoint at `/api/v1/transfers/46` is listed as "Premium API Access." Its x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x8335…2913) on Base, and requires a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The timeout for payment settlement is 300 seconds. No detailed documentation for this particular endpoint's input/output schema was found beyond the generic x402 challenge metadata.
The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, the docs, pricing, and API pages returned only a "Connect wallet" prompt with no further technical documentation, so the actual behavior and response formats of these endpoints remain unverified.
Capabilities
Use cases
- —Agents that need on-demand API access without pre-registration or API keys
- —Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing
- —Testing x402 payment flows on Base network at low cost
Fit
Best for
- —Developers exploring x402 payment protocol integrations
- —AI agents needing keyless, pay-as-you-go API access
- —Low-volume or sporadic API consumers who want no subscription commitment
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation and guaranteed SLAs
- —Consumers without access to USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/46 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the specific endpoint's input parameters or response schema. The docs, pricing, and API pages all returned only 'Connect wallet' with no usable content. The purpose of '/api/v1/transfers/46' specifically is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no technical content
- —The specific purpose and expected input/output of /api/v1/transfers/46 is unknown; 'Premium API Access' is vague
- —No OpenAPI spec, no examples, no error documentation found
- —The broad range of advertised endpoints (AI, finance, analytics, etc.) could not be verified for actual functionality
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/46
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transfers/46
- —Docs, pricing, and API pages return only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs