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, paid in USDC on the Base network.
The specific endpoint at `/api/v1/charges/87` is listed as "Premium API Access" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request.
Documentation 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 from the crawl. The exact functionality behind the "Premium API Access" label at `/api/v1/charges/87` is unclear — it does not map to any of the named endpoints listed on the homepage. Without documentation or example payloads, it is difficult to determine what this specific endpoint returns.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates
- —Running utility operations like geocoding, validation, and data conversion with no signup
Fit
Best for
- —Agents or developers who want instant API access without API keys or accounts
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
- —Crypto-native applications that can pay in USDC on Base
Not for
- —High-volume production workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Developers without a Base-compatible wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation beyond a landing page listing, and no request/response examples. The specific endpoint '/api/v1/charges/87' is not described anywhere on the site. Pricing is clear but functionality is opaque.
Warnings
- —The endpoint path /api/v1/charges/87 does not correspond to any named endpoint on the homepage — its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, no request/response schema, and no usage examples are available.
- —The breadth of claimed capabilities (16+ endpoints across 4 categories) cannot be verified from the crawl.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/charges/87
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet' with no further content.https://lowpaymentfee.com/docs