x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.
What it does
This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/137` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. It is likely one of the generation/utility endpoints offered by the platform.
Payment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request. The endpoint accepts HTTP POST requests and returns `application/json` responses. No API keys are required; authentication and payment are handled entirely through the x402 payment header. The platform advertises no rate limits and instant access.
The platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal "Connect wallet" page with no substantive content, so there is no schema documentation, request/response examples, or detailed feature descriptions available. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Accessing a generation or utility API endpoint without traditional API key signup
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven workflows that need instant, keyless API access
Fit
Best for
- —Developers who want to pay per request with no subscription commitment
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto-native (USDC on Base) payment rails
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing at $0.02 may not be cost-effective
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/137 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is zero documentation on what this specific resource does, no request/response schema, and all doc pages are empty stubs. The listing is effectively a stub with confirmed liveness.
Warnings
- —No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content.
- —The exact functionality of /api/v1/generate/resource/137 ('Premium API Access') is undocumented; its purpose must be guessed from the URL path.
- —No request or response schema is provided; callers have no way to know what payload to send or what to expect back.
- —The platform appears to be a demo or early-stage project with placeholder documentation.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/generate/resource/137
- —Platform advertises $0.02/request pricing, no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/generate/resource/137
- —Documentation pages resolve to minimal 'Connect wallet' content with no substantive docshttps://lowpaymentfee.com/docs