Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories. 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/v1/products/81` is listed as "Premium API Access" and returns an x402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 exact scheme to the payTo address, with a 300-second timeout.
The platform advertises multiple API categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export. However, the specific functionality behind the `/api/v1/products/81` "Premium API Access" endpoint is not documented — no request/response schema, no examples, and no detailed docs are available. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Accessing premium API data without traditional API key registration
- —Making one-off API calls paid per request in USDC on Base
- —Agent-driven workflows that need frictionless pay-as-you-go API access
Fit
Best for
- —Developers wanting zero-signup, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users already holding USDC on Base who want instant API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —High-volume consumers who need bulk pricing or subscription discounts
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/81 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for what this specific endpoint does, no request/response schema, no examples, and the docs pages are empty. The 'Premium API Access' label is generic and uninformative.
Warnings
- —No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content
- —The specific functionality of /api/v1/products/81 ('Premium API Access') is completely undocumented
- —No request or response schema provided; callers cannot know what to send or what to expect
- —No OpenAPI spec, no ai-plugin manifest, no agents.txt found
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, 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/81
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com