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/wire/145` 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
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 per request price point.
However, the specific endpoint probed here (`/api/v1/wire/145`) does not clearly map to any of the named API categories on the landing page. Its description is simply "Premium API Access" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or usage examples. Without knowing what this endpoint actually does or what its request/response format looks like, callers should treat this as an opaque paid endpoint with uncertain functionality.
Capabilities
Use cases
- —Paying per-call for API access without traditional API key registration
- —Integrating x402-compatible agents that settle in USDC on Base
- —Accessing utility or data endpoints with zero upfront commitment
Fit
Best for
- —Agents or developers with x402-compatible wallets on Base
- —Use cases requiring keyless, pay-as-you-go API access
- —Low-volume callers who want no subscription or minimum spend
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume production workloads where per-call pricing may add up
- —Anyone who needs to understand the exact response format before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/145 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality is unknown. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content.
- —The endpoint path /api/v1/wire/145 does not correspond to any named API on the landing page; its actual functionality is unknown.
- —No OpenAPI schema, request format, or response format is documented anywhere.
- —No examples of successful responses are available to verify the endpoint returns useful data.
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/wire/145
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.https://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, instant access, and Base network settlement.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/wire/145