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 broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transfers/187` is listed as "Premium API Access" and advertises a max payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no actual technical documentation, request/response schemas, or usage examples. Without documentation it is unclear what request bodies these endpoints expect or what response formats they return. The `/transfers/187` endpoint name does not clearly map to any of the advertised API categories, adding further ambiguity.
Capabilities
Use cases
- —Agents needing on-demand API access without subscription or API key management
- —Programmatic access to analytics, AI inference, or financial data with per-call USDC payments
- —Web3-native applications that want to pay for utility services directly from a wallet
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents with x402 payment capability on Base
- —Projects needing low-cost micropayment-settled API calls
Not for
- —Users who need detailed API documentation and guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without USDC on Base network or x402 payment infrastructure
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/187 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is zero usable documentation — docs, API, pricing, and README pages all show only 'Connect wallet'. No request/response schemas, no examples, and the endpoint path '/transfers/187' doesn't clearly correspond to any advertised service. Effectively a stub listing.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet'
- —The endpoint path /api/v1/transfers/187 does not match any of the advertised API categories on the homepage
- —No request or response schema is documented; callers cannot determine what to send or expect back
- —Unknown what 'Premium API Access' actually provides — the name is generic
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (equals $0.02)https://lowpaymentfee.com/api/v1/transfers/187
- —Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no documentation contenthttps://lowpaymentfee.com/docs