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/29` is listed as "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header to each request, and no API keys, rate limits, or subscriptions are required.
The broader platform advertises four categories of endpoints: 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 listed at the same $0.02/request price point. However, the specific `/api/v1/trades/29` endpoint does not appear in the site's public directory, and no documentation or schema details are available for it — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content.
Without request/response schemas or documentation for this particular endpoint, callers will need to experiment with POST requests to discover the expected input format and output structure. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation is a significant limitation.
Capabilities
Use cases
- —Accessing trade data or executing trade-related queries via a single micropayment
- —Integrating pay-per-use API calls into agent workflows without managing API keys
- —Programmatic access to premium data behind x402 payment gates
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or exploratory API usage where subscriptions are overkill
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integration
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/29 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and the specific /api/v1/trades/29 path is not listed on the site's public directory. The docs and other pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No request or response schema available for /api/v1/trades/29
- —The endpoint path /api/v1/trades/29 does not appear in the site's public API directory
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —Purpose of 'Premium API Access' at this specific trades endpoint is unclear
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/trades/29
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com