Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/messages/110` is listed as "Premium API Access" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it accepts HTTP POST and returns `application/json`. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.
Payment is handled via the x402 "exact" scheme: the caller must include an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payTo address on Base. The timeout for payment settlement is 300 seconds.
Capabilities
Use cases
- —Running AI inference (sentiment, summarization, classification, embeddings) without managing API keys
- —Fetching real-time crypto token quotes, gas estimates, and exchange rates on a per-call basis
- —Geocoding addresses or validating data with zero upfront commitment
- —Exporting data or generating analytics reports with micropayments
- —Agents autonomously purchasing API calls using x402 USDC payments on Base
Fit
Best for
- —AI agents that need keyless, pay-per-call access to diverse utility endpoints
- —Developers prototyping with low-cost, no-commitment API access
- —Web3-native applications that prefer on-chain payment settlement
Not for
- —High-volume production workloads where per-request pricing becomes expensive compared to subscription plans
- —Users who need detailed SLAs, rate-limit guarantees, or enterprise support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/110 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/v1/messages/110",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-signed-usdc-payment>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific /api/v1/messages/110 endpoint has no documentation beyond the generic title "Premium API Access", no request/response schema, no examples, and the crawled docs/pricing/README pages returned only "Connect wallet" with no useful content. The platform lists many endpoints but provides no detail on any of them.
Warnings
- —The specific endpoint /api/v1/messages/110 has no documentation — its purpose, expected input, and response format are unknown.
- —No OpenAPI spec, no request/response schema, and no usage examples are available.
- —The /pricing, /api, and /README pages returned no meaningful content (only 'Connect wallet').
- —The platform lists many endpoint categories (AI, finance, analytics, utilities) but none are individually documented — actual functionality is unverifiable.
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/110 requires up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/messages/110
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com