Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides 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, paid in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/inbox/197` is listed as "Premium API Access" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made per-call with no API keys, no rate limits, and no minimum commitments required. The x402 challenge specifies a POST method with a 300-second timeout.
Documentation is minimal — the site's /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose and behavior of the `/api/v1/inbox/197` endpoint specifically is unclear; it may be a generic inbox or messaging endpoint, but this is not documented. The broader platform lists 16 endpoints across the four categories, all at the same price point.
Capabilities
Use cases
- —Programmatic access to data analytics, AI inference, finance data, or utility services without API key management
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Prototyping or low-volume usage where per-request pricing avoids subscription overhead
Fit
Best for
- —Developers or agents wanting zero-commitment, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or bursty workloads where $0.02/request is cost-effective
Not for
- —High-volume production workloads where per-request costs add up quickly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/inbox/197 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schema, no documentation for the specific inbox/197 endpoint, and the /api, /pricing, and /README pages are empty. The endpoint's actual functionality is unknown.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose of /api/v1/inbox/197 ('Premium API Access') is undocumented and unclear
- —All documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content
- —No request or response examples are available; input format is unknown
- —The platform lists 16 endpoints but none have documented schemas or usage guides
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/inbox/197 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/inbox/197
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com