Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/endpoint-11` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network. The probed endpoint returns a live 402 challenge confirming it accepts x402 payments.
The specific endpoint `/api/endpoint-11` is labeled "Premium API Access" but its exact functionality is not documented beyond that generic title. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and has a 300-second payment timeout.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/README`) all returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and usage examples are unavailable. The exact capability behind this particular endpoint path remains unclear.
Capabilities
Use cases
- —Accessing a pay-per-request API without needing API keys or subscriptions
- —Making programmatic calls settled in USDC on Base via x402 protocol
- —Agent-driven API consumption with per-call crypto micropayments
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-11 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request USDC on Base). However, the actual functionality behind '/api/endpoint-11' is completely undocumented — the title is just 'Premium API Access' with no schema, parameters, or response examples. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —The specific functionality of /api/endpoint-11 is unknown — 'Premium API Access' is a generic label with no further documentation.
- —All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.
- —No request or response schema is available; integration requires trial-and-error or contacting the provider.
- —This endpoint path does not match any of the documented API paths listed on the homepage (e.g., /api/v1/*, /api/v2/*), raising questions about what it actually does.
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network with a 300-second timeout.https://lowpaymentfee.com/api/endpoint-11
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/endpoint-11