Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, 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 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 and settle in USDC on the Base network.
The specific endpoint at `/api/v1/charges/267` 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 given USDC's 6 decimals. Payment is made via the x402 exact scheme — no API keys, no subscriptions, no rate limits. The endpoint accepts HTTP POST and returns application/json.
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 spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The landing page lists many endpoints but provides no detail on input parameters or output formats. As a result, while the endpoint is confirmed live and the pricing is clear, the actual functionality behind "Premium API Access" at `/api/v1/charges/267` is unknown.
Capabilities
Use cases
- —Accessing pay-per-call data analytics or AI inference without managing API keys or subscriptions
- —Programmatic agents making one-off API calls settled instantly in USDC on Base
- —Integrating low-cost utility endpoints (geocoding, validation, conversion) into workflows
Fit
Best for
- —Developers or agents wanting zero-friction, keyless API access
- —Crypto-native applications that can settle payments in USDC on Base
- —Low-volume or bursty usage patterns where per-request pricing is economical
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/267 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific functionality of /api/v1/charges/267 ('Premium API Access') is entirely undocumented. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — actual request parameters and response format are unknown
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific endpoint /api/v1/charges/267 is labeled 'Premium API Access' but its actual functionality is not described anywhere
- —The endpoint path '/charges/267' does not correspond to any of the named endpoints on the landing page catalog
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and settle on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/charges/267
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet'https://lowpaymentfee.com/docs