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/transactions/212` 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 listed at the same $0.02/request price point.
However, the specific endpoint being listed here (`/api/v1/transactions/212`) does not clearly map to any of the documented API categories. 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 or schema details. Without more information, the exact purpose and response format of this particular endpoint remain unclear.
Capabilities
Use cases
- —Accessing paid API endpoints without traditional API key registration
- —Making one-off API calls with per-request USDC micropayments on Base
- —Integrating x402-compatible agents with pay-as-you-go data services
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents with x402 payment capability on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/212 \
-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 OpenAPI schema, no example request/response, and the purpose of this specific endpoint (/api/v1/transactions/212) is entirely undocumented. The docs/pricing/API pages all render only a wallet-connect prompt.
Warnings
- —The specific endpoint /api/v1/transactions/212 has no documentation explaining what it does or what it returns.
- —No OpenAPI schema, request body schema, or response schema is available.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.
- —The endpoint path does not match any of the advertised API categories on the landing page.
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/transactions/212
- —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/transactions/212
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com