Pay-per-call API platform on Base offering AI, analytics, finance, and utility endpoints at $0.02 each via x402.
What it does
lowpaymentfee.com is an x402-enabled API platform 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint at `/api/v2/config` is listed as "Premium API Access" and returns an x402 challenge requesting up to 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 a 300-second timeout. The endpoint accepts POST requests and returns application/json.
Documentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The actual behavior and response format of the `/api/v2/config` endpoint (and the other listed endpoints) cannot be confirmed from the available material.
Capabilities
Use cases
- —Running sentiment analysis or text classification on demand without managing API keys
- —Fetching real-time crypto price feeds or gas estimates with per-call USDC payments
- —Geocoding addresses or converting data formats via lightweight utility endpoints
- —Generating text embeddings for search or recommendation pipelines
- —Exporting analytics data or generating reports on a pay-as-you-go basis
Fit
Best for
- —Agents or apps that need low-friction, keyless API access paid in crypto
- —Developers wanting to test multiple AI/data/finance endpoints at a flat $0.02 per call
- —Web3-native workflows that already hold USDC on Base
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production workloads that require SLAs, rate-limit guarantees, or bulk pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/v2/config \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The actual functionality behind the endpoints cannot be verified from available material, making this effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — endpoint behavior is unverifiable
- —All doc/pricing/README pages render only 'Connect wallet' with no technical content
- —The specific purpose of /api/v2/config ('Premium API Access') is unclear — it may be a configuration or meta endpoint rather than a data endpoint
- —No request body schema or response examples are documented anywhere in the crawled material
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/v2/config requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v2/config
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —AI endpoints include sentiment analysis, text summarization, classification, and embeddingshttps://lowpaymentfee.com