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-61 is an x402-gated "Premium API Access" service settling payments in USDC on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913), which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider's landing page advertises a broad catalog of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. However, this specific endpoint (/api/endpoint-61) does not correspond to any of the named endpoints listed on the site. Its exact functionality is unclear; the x402 challenge describes it only as "Premium API Access" with a JSON MIME type and POST method.
Because there is no OpenAPI schema, no request/response examples, and no documentation beyond the generic landing page, it is impossible to determine what data or computation this particular endpoint returns. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. Agents considering this endpoint should be aware that the actual capability behind /api/endpoint-61 is undocumented.
Capabilities
Use cases
- —Programmatic access to an undocumented premium API endpoint via x402 micropayment
- —Agent-driven pay-per-call workflows on the Base network without API key management
- —Testing x402 payment flows against a live USDC-settled endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that need keyless, pay-per-request API access
- —Low-cost micropayment API consumption at $0.02/call
Not for
- —Users who need documented request/response schemas before integrating
- —Production workloads requiring guaranteed SLAs or detailed error handling
- —Anyone needing to know exactly what the endpoint returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-61 \
-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 zero documentation on what /api/endpoint-61 actually does — no OpenAPI schema, no request/response examples, and no description beyond the generic title. The docs pages are empty. This is effectively a stub listing.
Warnings
- —Endpoint /api/endpoint-61 does not match any named endpoint on the provider's landing page — its actual functionality is unknown.
- —No OpenAPI schema, request format, or response format is documented anywhere.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.
- —The provider lists many endpoints on the homepage but none at this specific path; it may be a test or placeholder endpoint.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/endpoint-61
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no additional contenthttps://lowpaymentfee.com/docs