Pay-per-request API platform on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.
The specific endpoint at `/api/v1/products/87` is listed as "Premium API Access" and returns `application/json`. 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. The endpoint accepts POST requests and has a payment timeout of 300 seconds.
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. However, documentation beyond the landing page is extremely thin; the docs, API, pricing, and README pages all appear to require a wallet connection and contain no visible content. No OpenAPI schema, request/response examples, or detailed parameter documentation were found.
Capabilities
Use cases
- —Agents that need on-demand API access without managing API keys or subscriptions
- —Fetching financial data, exchange rates, or gas estimates with per-call USDC payments
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) via simple HTTP POST
- —Geocoding or data conversion utilities paid per request
Fit
Best for
- —AI agents and bots that can settle x402 payments on Base
- —Developers who want zero-signup, pay-as-you-go API access
- —Low-volume or sporadic API consumers who don't want monthly commitments
Not for
- —High-volume production workloads where $0.02/request adds up quickly
- —Users without a Base-compatible USDC wallet
- —Anyone needing detailed API documentation or SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt with no content. The purpose of this specific /products/87 endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or schema documentation available — request parameters and response format are unknown
- —All doc/pricing/README pages require wallet connection and show no readable content
- —The specific purpose of /api/v1/products/87 ('Premium API Access') is not explained anywhere
- —No request or response examples could be found
Citations
- —The platform charges $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/products/87
- —The platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com