Pay-per-call API suite on Base (USDC) covering AI, analytics, 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 infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/messages/25` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.
The broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 pricing. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no further technical detail.
Capabilities
Use cases
- —Running one-off AI inference tasks (sentiment, summarization, classification) without signing up for an account
- —Fetching real-time crypto token quotes or gas estimates via a single paid HTTP call
- —Geocoding addresses or validating data on demand with per-request USDC micropayments
- —Exporting analytics data or generating insights without subscription commitments
Fit
Best for
- —Agents or bots that need instant, keyless API access paid per call
- —Developers prototyping with multiple API categories (AI, finance, geo) under one provider
- —Web3-native workflows that can settle payments in USDC on Base
Not for
- —High-volume production workloads where per-request pricing at $0.02 adds up quickly
- —Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating
- —Callers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/25 \
-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 documentation, no examples, and the /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The purpose of the specific '/messages/25' endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —The specific endpoint /api/v1/messages/25 has no description beyond 'Premium API Access'; its actual functionality is unclear
- —All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content
- —The platform lists many endpoint categories but none could be verified for actual functionality beyond the 402 challenge
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (scheme: exact, timeout: 300s)https://lowpaymentfee.com/api/v1/messages/25
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/messages/25