Pay-per-call API platform on Base network via x402 — $0.02/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-12`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.
The broader 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 endpoints are priced identically at $0.02 per call with no API keys, no rate limits, and no minimum commitments required.
However, this particular endpoint (`/api/endpoint-12`) does not correspond to any of the named endpoints listed on the site's landing page, and no documentation, input/output schema, or usage examples are available. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without knowing what this endpoint actually does, its practical utility is unclear.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without API key registration
- —Agent-driven workflows that settle per-request payments in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that need keyless, pay-as-you-go API access on Base
- —Low-cost per-request API consumption without subscriptions
Not for
- —Users who need documented input/output schemas before calling an endpoint
- —Production workloads requiring SLA guarantees or detailed error handling documentation
- —Anyone needing free or non-crypto payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-12 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the endpoint path does not match any named service on the site. The docs pages are empty. It is effectively a stub listing.
Warnings
- —Endpoint path /api/endpoint-12 does not match any of the named endpoints listed on the provider's landing page — its actual functionality is unknown.
- —No input schema, output schema, or usage examples are available.
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content.
- —No OpenAPI spec, ai-plugin manifest, or agents.txt discovered.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x8335…) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/endpoint-12
- —The site advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com