x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.
What it does
lowpaymentfee.com is a collection of x402-protocol pay-per-call API endpoints hosted on the Base network. The specific endpoint at `/api/v1/trades/97` is listed as "Premium API Access" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 exact scheme with no API keys or rate limits required.
The broader lowpaymentfee.com platform advertises endpoints across four categories: 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 (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
The specific `/api/v1/trades/97` endpoint's purpose is not well-documented beyond the generic "Premium API Access" label. It accepts POST requests and returns `application/json`. No OpenAPI schema, request body documentation, or response examples were found in the crawl. The docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt with no additional content, making it impossible to determine the exact data this particular endpoint returns.
Capabilities
Use cases
- —Fetching trade-related data on a pay-per-call basis without managing API keys
- —Agent-driven workflows that need instant API access with crypto micropayments
- —Integrating low-cost data endpoints into automated pipelines settled on Base
Fit
Best for
- —Developers who want keyless, pay-as-you-go API access
- —AI agents with USDC wallets on Base that need on-demand data
- —Prototyping and low-volume usage where subscription plans are overkill
Not for
- —High-volume production workloads where per-call pricing adds up quickly
- —Users without a Base-compatible USDC wallet
- —Anyone needing detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/97 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/trades/97 actually returns, no request/response schema, and all doc pages render only 'Connect wallet'. The endpoint's purpose is essentially unknown beyond its generic title.
Warnings
- —No documentation available — all doc pages render only a 'Connect wallet' prompt
- —The specific purpose and response format of /api/v1/trades/97 is undocumented
- —No OpenAPI spec or request/response schema found
- —The endpoint name 'Premium API Access' is generic and uninformative
Citations
- —The endpoint returns a 402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/trades/97
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/trades/97
- —All endpoints priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com