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 catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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, settled in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/messages/120` is listed as "Premium API Access." Its x402 challenge advertises 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 with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.
Note that the `/api/v1/messages/120` endpoint does not clearly map to any of the four advertised categories on the landing page, and no documentation, OpenAPI schema, or usage examples are available. The crawled /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. The actual request/response format for this specific endpoint is unknown.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys
- —Fetching real-time financial data such as token quotes, exchange rates, and gas estimates
- —Running data analytics queries (metrics, reports, insights) with micropayment settlement
- —Geocoding, validation, and data conversion via utility endpoints
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments in USDC on Base
- —Projects needing low-cost micropayment-gated endpoints without subscription overhead
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Applications requiring high-throughput bulk access with negotiated pricing
- —Users without USDC on Base or an x402-compatible payment client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/120 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no request/response examples, and the /api, /pricing, and /README pages are empty. The specific endpoint path (/api/v1/messages/120) doesn't match any documented category, making its purpose unclear.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The /api/v1/messages/120 path does not correspond to any of the categories listed on the landing page — its actual functionality is unknown
- —The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')
- —No request body schema or response examples are available anywhere in the crawl
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/120 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/messages/120
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com