Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 at $0.02 per request, settled in USDC on the Base network.
The specific endpoint at `/api/v1/payments/247` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no upfront commitments are required. The endpoint accepts POST requests and returns application/json.
Documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. It is unclear what specific functionality the "Premium API Access" endpoint at `/payments/247` provides, as it does not map to any of the named endpoints listed on the homepage. Prospective users should be aware that without documentation, the actual input parameters and response format for this endpoint are unknown.
Capabilities
Use cases
- —Programmatic access to API services without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
- —Accessing data, AI inference, finance, or utility endpoints with per-request billing
Fit
Best for
- —Developers or agents wanting zero-commitment, pay-as-you-go API access
- —x402-compatible clients that can settle USDC payments on Base
- —Use cases requiring low-cost per-request pricing without rate limits
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Users without a Base-compatible USDC wallet
Quick start
# Send a POST with x402 payment header to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/payments/247 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documentation beyond a landing page, no request/response examples, and the specific purpose of the /payments/247 endpoint is unclear. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.
- —The endpoint path /api/v1/payments/247 does not correspond to any of the named endpoints listed on the homepage; its actual functionality is unknown.
- —No OpenAPI spec or request/response schema is provided, making integration difficult without trial and error.
- —No examples of expected input or output are available from any crawled source.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.https://lowpaymentfee.com/api/v1/payments/247
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs