Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or subscriptions required.
The specific endpoint at `/api/v1/payments/175` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base (asset contract 0x8335…2913). The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the "Premium API Access" endpoint actually returns or what input it expects. Without documentation, it is unclear what data or functionality this specific endpoint provides.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Prototyping integrations without subscription commitments
Fit
Best for
- —Developers who want zero-signup, pay-per-call API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over API key management
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume use cases where per-request pricing may add up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/175 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what this endpoint actually does, no request/response schema, and no examples. The 'Premium API Access' label is completely generic. Docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided for this endpoint
- —The label 'Premium API Access' gives no indication of what data or functionality is returned
- —Cannot verify what this endpoint actually does without paying for a request
Citations
- —Endpoint returns HTTP 402 with x402 challenge requesting up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/175
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/175
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com