Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure 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/customers/61` is listed as "Premium API Access" and returns `application/json` via POST. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing.
The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same price point. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available.
Capabilities
Use cases
- —Fetching customer or resource data with per-call USDC micropayments
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys
- —Retrieving real-time finance and crypto market data on demand
- —Using utility services like geocoding, validation, and conversion without subscriptions
Fit
Best for
- —Agents or bots that need keyless, pay-as-you-go API access
- —Developers prototyping with low-cost, no-commitment endpoints
- —Web3-native applications already operating on Base with USDC
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed SLAs, uptime guarantees, or enterprise support
- —Callers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/61 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all docs pages are gated behind wallet connection, leaving the actual functionality of /api/v1/customers/61 unclear.
Warnings
- —No public documentation — all doc pages return only a 'Connect wallet' prompt
- —No OpenAPI or request/response schema available; the purpose of /api/v1/customers/61 is not explained beyond 'Premium API Access'
- —The broad range of advertised endpoints (AI, finance, utilities) could not be independently verified for functionality
- —No information on uptime, SLAs, or rate limits beyond the claim of 'no rate limits'
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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/customers/61
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com