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 exposes a broad collection of 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 — no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/messages/119` is labeled "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the payTo address. The endpoint returns application/json and has a max timeout of 300 seconds.
Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind the `/api/v1/messages/119` path is unclear; it does not map to any of the named endpoints listed on the homepage. Agents should treat this as a live but under-documented endpoint.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management
- —Fetching real-time financial data or crypto gas estimates with per-call USDC payments
- —Geocoding or data validation as a utility service in automated pipelines
- —Exporting analytics data or generating insights via pay-as-you-go endpoints
Fit
Best for
- —AI agents that can settle x402 payments in USDC on Base
- —Developers wanting zero-commitment, no-API-key access to common utility endpoints
- —Micropayment-friendly workflows where $0.02/call is cost-effective
Not for
- —High-volume batch processing where per-call pricing adds up quickly
- —Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating
- —Applications requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/119 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific /api/v1/messages/119 path is not described anywhere on the site. Documentation pages return only wallet-connect prompts. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The path /api/v1/messages/119 does not correspond to any named endpoint on the homepage — its actual functionality is unknown
- —All documentation routes (/api, /pricing, /README) return only a wallet-connect prompt with no content
- —No request body schema or response examples are available
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/messages/119 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/messages/119
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com