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 marketplace that exposes a broad set 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, settled in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/messages/112` is listed as "Premium API Access." Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913, which is USDC on Base with 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts HTTP POST requests and returns application/json.
Note that the specific functionality behind `/api/v1/messages/112` is not documented beyond the generic "Premium API Access" label. The site's /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no additional documentation or schema details. Without an OpenAPI spec, request/response examples, or detailed docs, the exact input parameters and output format for this endpoint remain unknown.
Capabilities
Use cases
- —Agents that need on-demand API access without managing API keys or subscriptions
- —Programmatic access to utility/data endpoints with per-call USDC micropayments
- —Testing x402 payment flows on the Base network
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents with x402 payment capability on Base
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who need bulk pricing or SLAs
- —Anyone without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/112 \
-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), but there is no OpenAPI spec, no request/response schema, no documentation beyond a generic label, and the /api, /pricing, and /README pages are empty. The specific purpose of /api/v1/messages/112 is undocumented.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The exact functionality of /api/v1/messages/112 ('Premium API Access') is not described anywhere
- —Site documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content
- —Request and response formats are completely unknown
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 Base networkhttps://lowpaymentfee.com/api/v1/messages/112
- —Endpoint described as 'Premium API Access' accepting POST with application/json mime typehttps://lowpaymentfee.com/api/v1/messages/112
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com