Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/payments/274` is labeled "Premium API Access" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call.
The platform advertises a uniform $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. Endpoints span categories including metrics/reports (Data & Analytics), sentiment analysis/summarization/classification/embeddings (AI & ML), price feeds/exchange rates/token quotes/gas estimates (Finance & Web3), and geocoding/validation/conversion/generation (Infrastructure). The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.
Documentation is extremely sparse — the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind the "Premium API Access" label at this specific path (`/payments/274`) is unclear and may differ from the categorized endpoints listed on the homepage.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token quotes, gas estimates, and exchange rates
- —Running utility operations like geocoding, validation, and data conversion on a per-call basis
- —Integrating pay-per-use analytics and data export into agent workflows
Fit
Best for
- —Agents needing low-friction, keyless API access with crypto micropayments
- —Developers who want pay-as-you-go pricing without subscriptions or rate limits
- —Web3-native applications that can settle in USDC on Base
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Applications requiring high-volume bulk access where per-call pricing is inefficient
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/274 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and settlement details, but documentation is effectively nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/payments/274 ('Premium API Access') is not explained beyond its label. The listing is largely a stub.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.
- —No OpenAPI or JSON schema available for any endpoint.
- —The specific functionality of /api/v1/payments/274 ('Premium API Access') is unclear — it does not match any of the categorized endpoints listed on the homepage.
- —No request or response examples are available anywhere in the crawled material.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/payments/274
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/274
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com