x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/7` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which at 6 decimals equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints.
The broader platform advertises four categories of APIs: 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 identically at $0.02 per call with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint including `/api/v1/trades/7`. The endpoint name "Premium API Access" and path segment `trades/7` suggest it may return trade-related data, but this is unconfirmed. The x402 challenge is live and well-formed, confirming the endpoint is operational.
Capabilities
Use cases
- —Fetching trade-related data via a single micropayment without needing an API key
- —Integrating pay-per-call data access into autonomous agents on Base
- —Accessing premium financial or trade information with no subscription commitment
Fit
Best for
- —Agents or developers wanting zero-setup, pay-as-you-go API access
- —x402-compatible clients that can settle USDC on Base
- —Use cases requiring low-cost, no-commitment API calls
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/7 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The purpose of `/api/v1/trades/7` is unclear — the path and title provide minimal context. Effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition found for any endpoint
- —The purpose and expected input/output of /api/v1/trades/7 is unknown; 'Premium API Access' is a generic label
- —No request or response examples available anywhere in crawled content
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/trades/7
- —The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no further contenthttps://lowpaymentfee.com/docs