Pay-per-request API platform on Base via x402 — $0.02/call 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 and settle in USDC on the Base network.
The specific endpoint being listed here — `/api/v1/orders/67` — is described as "Premium API Access" in its x402 challenge. Its maxAmountRequired is 20000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated entirely by the x402 payment protocol.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/orders/67` endpoint actually returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them. The purpose of the `/orders/67` path specifically (as opposed to the other listed endpoints) is unclear.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis
- —Running utility operations like geocoding, validation, and data conversion with micropayments
Fit
Best for
- —Agents or apps that need simple pay-per-call access without subscriptions or API keys
- —Developers experimenting with x402 protocol integrations on Base
- —Low-volume or bursty workloads where flat per-request pricing is preferable to monthly plans
Not for
- —High-volume production workloads where $0.02/request adds up quickly without bulk discounts
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/67 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($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 purpose of /api/v1/orders/67 is unexplained. The docs, pricing, and README pages are all empty stubs.
Warnings
- —No OpenAPI spec or request/response schema available for any endpoint
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content
- —The purpose and expected input/output of /api/v1/orders/67 specifically is undocumented
- —The broad catalog of 16+ endpoints is listed but none have detailed documentation
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/orders/67
- —Endpoint described as 'Premium API Access' accepting POST with application/json mime typehttps://lowpaymentfee.com/api/v1/orders/67
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com