Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-67`) is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, 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 broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-67`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.
The x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live. Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed feature description available for this specific endpoint.
Capabilities
Use cases
- —Agent-driven API consumption where per-call USDC micropayments replace traditional API key subscriptions
- —Programmatic access to premium data or services without upfront registration
- —Testing x402 payment protocol integrations on Base
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402 protocol users settling in USDC on Base
- —Low-volume callers who prefer per-request billing over subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-67 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/endpoint-67 actually does — no input/output schema, no examples, and the path doesn't match any named endpoint on the landing page. Docs pages are empty stubs.
Warnings
- —The path /api/endpoint-67 does not match any of the named endpoints listed on the lowpaymentfee.com landing page; its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' stub with no usable content.
- —No request or response schema is available — callers cannot determine what input is expected or what output is returned.
- —The platform lists many endpoint categories (AI, finance, data, infrastructure) but provides no evidence that any of them return real data.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request.https://lowpaymentfee.com/api/endpoint-67
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.https://lowpaymentfee.com/docs