x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com offers a collection of pay-per-call API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/trades/50` is listed as "Premium API Access" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge indicates a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.
The broader 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 listed at $0.02 per request 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/50`. The exact functionality of the trades endpoint is unclear from available materials; the name suggests it may return trade or transaction data, but this is speculative.
Capabilities
Use cases
- —Fetching trade or market data on a per-request payment basis without subscription
- —Accessing AI inference endpoints (sentiment, summarization, classification) via x402
- —Retrieving financial data like price feeds, exchange rates, and gas estimates with micropayments
- —Running utility operations (geocoding, validation, conversion) paid per call in USDC
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —Agents or bots that can settle payments in USDC on Base via x402
- —Use cases requiring low-cost per-request pricing without API key management
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/50 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation, no request/response examples, and the exact purpose of /api/v1/trades/50 is unclear. All secondary pages return only 'Connect wallet' with no useful content.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request parameters or response format
- —The exact functionality of /api/v1/trades/50 is unknown; 'Premium API Access' is the only description
- —No request or response examples available anywhere in crawled content
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/trades/50
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/trades/50
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com