Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at lowpaymentfee.com/api/endpoint-14 is an x402-gated "Premium API Access" service settled on the Base network using USDC. The x402 challenge confirms it is live and accepts payments of up to 20,000 base units of USDC (0.02 USD per request) to a specified wallet address. The provider advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider's landing page lists a broad catalog of endpoints spanning 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). However, this specific endpoint (/api/endpoint-14) does not appear in the documented catalog, and no schema, request/response examples, or detailed documentation are available for it. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content.
Because there is no OpenAPI spec, no input/output schema beyond the basic x402 challenge metadata, and no documentation describing what this endpoint actually does, its concrete functionality remains unknown. The endpoint is confirmed live (HTTP 402 returned with a well-formed x402 challenge), but agents should treat this as a stub listing until the provider publishes documentation.
Capabilities
Use cases
- —Programmatic pay-per-call access to an undocumented premium endpoint
- —Agent-driven API consumption without pre-registration or API keys
- —Micropayment-gated service calls settled on Base L2
Fit
Best for
- —Agents that can handle x402 payment flows on Base
- —Users who want keyless, pay-as-you-go API access
- —Developers experimenting with x402 protocol integrations
Not for
- —Anyone needing documented input/output schemas before calling
- —Use cases requiring guaranteed SLAs or support contracts
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-14 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but /api/endpoint-14 is not listed in the provider's own catalog, and no documentation, schema, or examples exist. Functionality is entirely unknown, making this effectively a stub.
Warnings
- —Endpoint /api/endpoint-14 does not appear in the provider's published API catalog — its purpose is unknown.
- —No OpenAPI spec, input schema, or response schema available.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no useful content.
- —Actual functionality behind this endpoint cannot be verified without making a paid request.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base networkhttps://lowpaymentfee.com/api/endpoint-14
- —Provider advertises $0.02/request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/endpoint-14
- —Provider lists categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com